The research, led by Tanongsak Yingnakorn and Sakhob Khumkoa of Suranaree University of Technology with collaborators including Andrew Abbott of the University of Leicester, tackles a gap that has long frustrated the recycling industry. Conventional recycling routes — pyrometallurgy, which smelts batteries at temperatures up to 1,700 degrees Celsius, and hydrometallurgy, which leaches metals with acids — have been studied extensively. But the upstream stage that feeds them, the mechanical shredding and sorting that concentrates the active electrode materials into black mass, has lacked rigorous paired assessments of cost and environmental impact. Without that baseline, engineers designing full recycling flowsheets have been working partly in the dark.

The team’s approach was refreshingly practical. They obtained donated post-consumer waste: a spent 13-kilogram electric vehicle battery module containing sixteen cells with a nickel-manganese-cobalt cathode, and roughly two kilograms of spent mobile phone batteries with lithium cobalt oxide cathodes. Safety came first. The EV module was discharged electrically, from about 28 volts down to below 0.1 volts, using a custom-built resistor bank. The phone cells, too small to wire individually, were immersed for 24 hours in a 10 percent salt solution — effective, but a choice that would later loom large in the environmental accounting. Electron microscopy and X-ray diffraction confirmed the EV cathode was close to the NMC622 composition, while the phone cells carried the classic cobalt-rich chemistry of consumer electronics.

With the batteries stabilized, the researchers fed them through a custom separation line combining three machines: a shredder that reduced everything to fragments under 10 millimeters, a zigzag air classifier that separates materials by density using a serpentine upward airflow, and a circular vibrating screen with a 500-micron mesh. Two processing routes were tested for each battery type, varying the order of screening and air classification. The verdict was clear. For EV modules, the route that screened first, then air-classified twice at motor frequencies of 23 and 55 hertz, recovered 93.28 percent of the available black mass. For phone cells, the analogous route achieved 75.77 percent. The shredded material was processed under a nitrogen purge to prevent reactions of the thermally unstable lithium hexafluorophosphate electrolyte, which can begin degrading below 40 degrees Celsius when exposed to moisture.

The quality of the recovered powder matters as much as the quantity, and here the results were striking. The EV black mass contained about 3.91 percent lithium, 15.02 percent nickel, 6.01 percent manganese, 7.41 percent cobalt and 53.7 percent carbon, with residual aluminum and copper held below 1 weight percent. The phone-derived powder carried 4.32 percent lithium and 30.95 percent cobalt, with 0.72 percent aluminum and 1.01 percent copper. Both comfortably meet commercial trading specifications, such as Fastmarkets’ thresholds of no more than 2 percent aluminum, copper or fluorine. X-ray diffraction showed the cathode crystal structures survived the mechanical journey intact — no phase transformations, no degradation — a critical point for any downstream process hoping to regenerate rather than merely dissolve the material.

Then came the money. The direct processing cost — electricity, nitrogen gas, and for the phone route, salt, water and hazardous waste disposal — came to just $0.11 per kilogram of EV battery input and $0.53 per kilogram for phone cells. Adding depreciation, labor and a 15 percent management overhead brought the loaded costs to $0.31 and $0.73 per kilogram respectively, far below the $2 to $6 per kilogram typical of pilot-scale processes. Against reference black mass prices of $14.22 per kilogram for NMC622 and $14.05 for lithium cobalt oxide, the baseline net profit was $6.89 per kilogram for EV modules and $8.23 for phone cells, assuming free feedstock. Even when the researchers modeled the realistic scenario of buying scrap on the open market — roughly $2.50 to $2.70 per kilogram in Southeast Asia — both routes remained solidly profitable.

A Monte Carlo simulation across five uncertain variables, from metal prices to plant utilization, reinforced the picture. The median net profit under combined uncertainty was $4.97 per kilogram for the EV route and $6.28 for phones, and the probability of the process losing money was 0.2 percent or less. Feedstock acquisition cost emerged as the dominant driver of profitability, dwarfing electricity prices and separation efficiency. The break-even feedstock price averaged $6.59 per kilogram for EV material — meaning current scrap prices would need to more than double before the flowsheet turned unprofitable. Notably, the phone route earned more per kilogram despite its lower separation efficiency, simply because phone batteries pack a higher proportion of active material and metal foil into every gram.

The life cycle assessment told a more nuanced story. Processing one kilogram of battery waste generated just 0.210 kilograms of carbon dioxide equivalent for the EV route and 0.241 for phones — figures dominated almost entirely by electricity consumption. Because Thailand’s grid draws more than 75 percent of its power from gas and coal, location matters enormously: the researchers calculated that moving the same process to a low-carbon grid would cut the global warming potential by 62.8 percent, from 0.210 to 0.078 kilograms of carbon dioxide equivalent per kilogram of input. The phone route’s Achilles heel was the salt-solution discharge step. When waste treatment was included, its carbon footprint jumped to 2.377 kilograms of carbon dioxide equivalent and its freshwater ecotoxicity soared to nearly 17 CTUe, driven by the incineration of contaminated brine. Reusing the discharge solution for additional batches could cut those impacts by 45 to 60 percent.

The authors are candid about the limits. The runs were single batches of 13 and 2 kilograms on a line designed for 100 kilograms per hour; zigzag classifier efficiency is known to degrade at higher solids loadings, so the figures represent a proof of concept rather than validated industrial performance. The two discharge methods differ between feedstocks, complicating direct comparison, and the life cycle inventory assigns no burden to the 5.5 to 8.3 percent of material lost to dust, volatilized electrolyte and incomplete retrieval — a conservative omission, since that fraction may contain hazardous hydrogen fluoride. Fluorine content could not be quantified with the available instrumentation, and only one cathode chemistry per feedstock was tested.

Still, the study offers something the field has lacked: a fully paired techno-economic and environmental baseline for the same physical flowsheet applied to two structurally distinct battery streams under identical accounting boundaries. Its strategic logic is compelling. Mechanical separation cannot recover individual elements or rebuild cathodes on its own, but as a pre-treatment it delivers a high-grade, low-contamination concentrate at a fraction of the cost of competing routes, feeding hydrometallurgical leaching or direct regeneration with maximum efficiency. As cobalt prices rally and black mass payables hit record highs, and as regulators push extended producer responsibility schemes that pay recyclers to accept spent packs, the humble workhorse of the recycling chain — the shredder, the air classifier, the vibrating screen — may prove to be the quiet engine that makes the battery circular economy finally add up.

Subject of Research: Techno-economic and life cycle assessment of black mass production from spent lithium-ion batteries

Article Title: Baseline techno-economic and life cycle assessment of black mass production

Article References: Yingnakorn, T., Kansomket, C., Longbutsri, C., Scott, S., Patcharawit, T., Yang, J. M., Abbott, A. P., & Khumkoa, S. (2026). Baseline techno-economic and life cycle assessment of black mass production. iScience, 29(10), Article 117729. https://doi.org/10.1016/j.isci.2026.117729

Image Credits: AI Generated

DOI: 10.1016/j.isci.2026.117729

Keywords: lithium-ion battery recycling, black mass, electric vehicles, techno-economic analysis, life cycle assessment, hydrometallurgy, NMC cathode, mechanical separation, circular economy, critical metals, battery discharge, carbon footprint

Social life cycle assessment has matured considerably over the past two decades. Guided by the ISO 14075 standard and the United Nations Environment Programme’s 2020 guidelines, it evaluates social impacts such as human rights, working conditions, cultural heritage and governance across a product’s entire life cycle, from raw material extraction through manufacturing, use and end of life. Stakeholders examined typically include workers, local communities, value chain actors, society at large and children. Yet the method’s DNA comes from environmental life cycle assessment, which was built to trace physical flows and processes. When applied to social questions, this heritage means S-LCA tends to anchor its analysis to the stages where materials physically move, leaving the social drama that surrounds a project, the permit battles, the community anxieties, the historical grievances, largely invisible.

The Finnish team, led by Anni Orola with colleagues Laura Kainiemi, Jarkko Levänen and Ville Uusitalo, turned to controversy mapping to fill that gap. The method is grounded in actor-network theory, a sociological framework developed by Bruno Latour and others that treats both human and non-human entities, from mining companies to protected frog species, as actors capable of shaping socio-technical systems. Controversy mapping, which began as a teaching tool in sociology and has grown into a serious research method, examines and visualizes public disputes by tracing who says what, who aligns with whom, and how arguments evolve over time. The approach proceeds through five stages: moving from statements to debates, from debates to actors, from actors to networks, from networks to broader worldviews, and finally to the politics of how controversies develop across time.

To test the approach, the researchers applied it to Finland’s battery material sector, covering mining, the production of precursor cathode active material, cathode active material and battery cathode production, along with transportation. Finland was a deliberate choice: the country holds reserves of multiple critical battery minerals and is investing heavily in its battery sector, yet despite its comparatively high level of social sustainability, battery material projects there have generated persistent contestation. The team collected data from Finnish-language online news media between November 2023 and July 2024, using Google Alerts with search terms for mining, battery metals and battery chemicals. After excluding unavailable and irrelevant items, they assembled a corpus of 93 articles spanning national and local newspapers, magazines and specialist publications, including interviews, opinion pieces and editorials.

The coding process, carried out iteratively with NVivo software and then organized in Excel, identified 95 actors engaged in the disputes. These ranged from mining and battery manufacturing companies and environmental non-governmental organizations to municipal governments, authorities such as the Finnish Safety and Chemical Agency, residents, landowners, business development companies, researchers and journalists. Notably, the analysis also included non-human actors, among them the Eurasian otter and the moor frog, both strictly protected under the European Union’s Habitats Directive, whose presence shapes the fate of mining projects. Strikingly, none of the 95 actors identified in the Finnish-language media represented the Sami, the indigenous people of northern Finland where several controversial projects are located, a gap the authors attribute to their data sources and a recognized digital bias in the method.

The mapped disputes revealed a rich landscape of arguments. Supporters of the battery industry, mostly companies, emphasized new jobs, economic benefits, risk management plans and the global imperative of the green transition, with some arguing that mining in Finland is more sustainable than in Africa. Opponents, largely NGOs and individual residents writing opinion pieces, pointed to Finland’s history of environmental damage from mining, potential biodiversity loss, sulfate emissions into the Baltic Sea, water contamination, impacts on reindeer herding, fishing, trekking and berry foraging, and what they called green sacrifice zones, where indigenous lands and protected areas are put to industrial use in the name of sustainability. Even battery material trade with Russia became entangled in the debates, with some actors questioning whether such commerce might support aggression against Ukraine, while a company representative defended it as sanction-compliant and even patriotic.

Perhaps the most consequential finding concerns timing. In conventional S-LCA, social impacts are usually assessed starting with raw material extraction. But the study shows that the socially decisive processes happen years or even decades earlier: area reservations that companies announce to claim prospecting rights, prospecting permits, environmental and water management permits, all of which can provoke community reactions, uncertainty and mental strain long before any mine is built. In the case of the AA Sakatti mining project near the Viiankiaapa wetland, public attention moved from the prospecting permit to on-site activism and finally to a visit by Finland’s environmental minister. Because these pre-production social processes can determine whether a project ever gains social acceptance, the authors argue that excluding them from S-LCA omits some of the most significant social impacts of all.

The case studies also demonstrated why stakeholder categories in S-LCA guidelines should be treated as illustrative rather than exhaustive. In the town of Hamina, home to a planned battery material plant by CNGR Finland, the municipality supported the project while residents, NGOs and a local fishing co-operative opposed it. Around the Suhanko Arctic Platinum project, neighboring municipalities split, with Ranua supporting the mine while Tervola and Simo raised concerns, partly because a wastewater pipe would cross Tervola’s territory without economic compensation and Simo was not invited into the environmental permit process. These procedural fairness issues, the researchers contend, are central to social acceptance, which research links to five drivers: the planning process, impacts on nature and residents, social norms, economic impacts and attitudes toward the energy transition.

On this basis, the study proposes that social acceptance should become a distinct impact subcategory within S-LCA, particularly for assessments involving high land use, such as mining, or emission potential, such as battery chemical manufacturing. The subcategory would focus on measuring the procedural justice experienced by local communities, and could be assessed through media coverage capturing both positive and negative viewpoints, an approach already used by sustainability rating platforms like EcoVadis. The authors note an important limitation: such a subcategory only works in countries with freedom of speech and a free press, though Finland ranks among the top five nations in the world press freedom index. Because the subcategory centers on procedural justice rather than overlapping outcomes, the researchers argue it would not result in double counting with existing S-LCA indicators.

The broader message extends beyond batteries. Industrial ecology has long excelled at quantifying environmental impacts, but the social dimension demands methods that can capture context, history and the plurality of actors, including those, like a protected frog or an unconsulted municipality, that fall outside standard stakeholder lists. Controversy mapping, the authors suggest, could serve as a preliminary data collection step before site-specific assessments, or as a complement to existing S-LCA databases, and could even help identify relevant actors before interviews begin. Future work might integrate additional social science perspectives, from institutional analysis to power relations between stakeholders, and test the approach in countries with different levels of institutional trust and press freedom. As the clean energy transition accelerates the global demand for battery materials, the Finnish study offers a timely reminder that the social license to operate is earned not in the factory, but in the long, contested years before ground is ever broken.

Subject of Research: Complementing social life cycle assessment with controversy mapping to assess social acceptance in the battery material industry

Article Title: Impact in a context: complementing social life cycle assessment with controversy mapping

Article References: Orola, A., Kainiemi, L., Levänen, J., & Uusitalo, V. (2026). Impact in a context: complementing social life cycle assessment with controversy mapping. Journal of Industrial Ecology. https://doi.org/10.1007/s44498-026-00153-6

Image Credits: AI Generated

DOI: 10.1007/s44498-026-00153-6

Keywords: social life cycle assessment, controversy mapping, actor-network theory, battery materials, social acceptance, mining, Finland, industrial ecology, life cycle thinking, procedural justice, stakeholder analysis, green transition

The research team, led by Nitika Rani with Pooja Arora and Smita Chaudhry as senior authors, set out to answer a question that affects millions of people across the developing world. As freshwater supplies grow scarcer, farmers increasingly turn to wastewater as a reliable, nutrient-rich alternative for irrigation. But that convenience carries a hidden cost: industrial and municipal effluents can carry chromium, lead, cadmium, copper, and nickel into the food chain, where they concentrate in the edible tissues of plants that people eat, often with minimal processing.

What makes the new study distinctive is its controlled comparative design. Rather than sampling vegetables from fields where countless variables confound the results, the researchers grew their test crops in pots under controlled conditions, irrigating them with water drawn from five distinct sources: effluent after primary treatment, after secondary treatment, and after tertiary treatment, plus raw drain water and clean groundwater. This allowed them to isolate the effect of water quality on metal uptake with unusual precision, and it represents one of the first head-to-head comparisons of primary, secondary, and tertiary-treated wastewater for vegetable cultivation under such conditions.

The water analysis produced a picture that was, on the surface, reassuring. Concentrations of chromium, lead, cadmium, and copper in every irrigation source remained within the permissible limits set by international guidelines. Only nickel broke the rules, exceeding the recommended threshold in drain water. Soil samples told a similar story: heavy metal concentrations in the growing medium stayed within safety thresholds across all treatments. If the analysis had stopped there, the conclusion would have been that treated wastewater is safe for growing food.

But the vegetables told a different story. When the researchers measured metal levels in the harvested fenugreek, spinach, and mustard, they found that chromium, ranging from 5 to 20 milligrams per kilogram, lead at 2.5 to 12.5 milligrams per kilogram, and cadmium at 0.5 to 1.5 milligrams per kilogram occasionally surpassed the limits established by the Codex Alimentarius Commission of the FAO and WHO and by WHO guidelines from 2007. In other words, water and soil that passed regulatory muster still produced vegetables that sometimes failed it.

The explanation lies in plant physiology. Leafy vegetables are among the most efficient accumulators of heavy metals because of how they take up and transport nutrients. Plants possess metal transport systems designed to shuttle essential elements like copper and zinc from roots to shoots, and these same pathways cannot fully distinguish essential micronutrients from toxic neighbors on the periodic table. Spinach, in particular, proved to be an aggressive accumulator. The bioconcentration factor, a ratio comparing metal concentration in plant tissue to that in soil, exceeded the critical value of 1 for both lead and copper in spinach, meaning the plant actively concentrated these metals in its leaves above the levels found in the ground it grew in.

The health risk calculations sharpened the concern. The researchers estimated the daily intake of metals for both adults and children consuming these vegetables and found that children consistently faced higher exposure per unit of body weight. The highest intakes were recorded for nickel in spinach, at 0.04 milligrams per kilogram of body weight in children and 0.03 in adults, followed closely by copper, at 0.015 milligrams per kilogram in children and 0.013 in adults. Because children eat more food relative to their body mass and their developing nervous systems are particularly vulnerable to neurotoxic metals like lead and cadmium, this disparity matters for public health planning.

The hazard index, which aggregates the non-carcinogenic risk from multiple exposure pathways, crossed into the danger zone for specific vegetable-metal combinations. Nickel in spinach and lead in both mustard and fenugreek produced hazard index values indicating a heightened risk of non-carcinogenic health effects, which can include damage to the kidneys, nervous system, and cardiovascular system over years of chronic exposure. While the study did not assess carcinogenic risk, chronic lead and cadmium exposure are both associated with serious long-term outcomes, and no safe blood lead level has been identified by health authorities.

Perhaps the most consequential finding is the disconnect between water quality compliance and food safety. The treated effluents used in the experiment met the relevant standards for irrigation water, yet the crops they nourished still occasionally exceeded food safety limits. This suggests that current wastewater treatment and reuse guidelines, which focus on the water itself, may not adequately protect consumers of leafy vegetables. Metals that fall below detection thresholds of concern in water can still accumulate over a growing season, and the bioconcentration behavior of species like spinach amplifies the exposure. The implication is that safety standards may need to account for the crop type, not just the water source, with leafy accumulators like spinach warranting stricter scrutiny than fruiting or grain crops.

For the millions of urban and peri-urban farmers who depend on wastewater irrigation, the study does not call for an outright ban but for smarter management. The results point toward crop selection as a practical intervention: choosing vegetables that accumulate fewer metals, or reserving treated wastewater for non-food crops, could reduce risk without eliminating a water resource that many communities cannot afford to lose. The researchers emphasize that their controlled pot design, while powerful for isolating variables, now needs to be complemented by field-scale studies that capture the full complexity of real farming systems. As water scarcity intensifies across South Asia and beyond, the question of what flows onto the fields, and what ends up on the plate, is becoming one of the most important food safety issues of the coming decade.

Subject of Research: Heavy metal accumulation in leafy vegetables irrigated with treated and untreated wastewater and associated food safety and health risks

Article Title: Heavy metal contamination in wastewater-irrigated leafy vegetables: implications for food safety

Article References: Rani, N., Arora, P., & Chaudhry, S. (2026). Heavy metal contamination in wastewater-irrigated leafy vegetables: implications for food safety. Environmental Monitoring and Assessment, 198(10), Article 1135. https://doi.org/10.1007/s10661-026-15939-1

Image Credits: AI Generated

DOI: 10.1007/s10661-026-15939-1

Keywords: heavy metals, wastewater irrigation, leafy vegetables, spinach, food safety, bioconcentration factor, health risk assessment, daily metal intake, hazard index, nickel, lead, cadmium

The research team focused on the estates of Attar, Miyanjolgeh, and two other industrial zones in the Neyshabur region, an area whose rapid industrial growth has gradually altered the chemical makeup of surrounding soils. Soil samples collected around these estates were analyzed for a suite of heavy metals, including nickel, chromium, cadmium, iron, and manganese. The analytical strategy combined classical geochemical assessment with spatial mapping and directional analysis, allowing the researchers to distinguish between metals that originate from the natural geological background and those whose patterns betray an industrial or agricultural fingerprint. This distinction matters enormously, because regulatory decisions about remediation and land use hinge on knowing whether elevated concentrations reflect human activity or simply the local bedrock.

The results revealed a striking contrast between different metals. Iron and manganese displayed stable, predictable patterns consistent with their natural lithogenic origin, varying little across the study area and showing no clear relationship to the industrial estates. Nickel and chromium, by contrast, exhibited pronounced spatial heterogeneity, with concentrations fluctuating sharply over short distances. The researchers interpret this patchiness as evidence of a dual origin: a naturally elevated geochemical background, common in regions with metal-rich parent rocks, superimposed on localized emissions from nearby industrial facilities. This combination makes nickel and chromium the two priority metals for environmental monitoring and health risk evaluation in the region, standing out as more consequential than the other elements measured.

Cadmium told a different story altogether. Rather than peaking near the industrial estates, cadmium concentrations increased with distance from the estates themselves, a pattern the researchers attribute to a blend of urban and agricultural sources. Cadmium is a well-known contaminant of phosphate fertilizers and is also associated with urban runoff and traffic-related deposition, so its distribution suggests that the agricultural lands and settlements surrounding the industrial zones contribute as much to soil cadmium as the factories do. This finding complicates the conventional assumption that industrial estates are the sole or even dominant sources of soil metal contamination in mixed land-use landscapes, and it underscores the need for source apportionment that considers the full mosaic of human activities.

Perhaps the most visually compelling evidence came from the directional analysis. When the researchers examined how concentrations varied along different compass bearings, they discovered peaks in metal levels along the north–south axis close to several of the estates. This orientation is unlikely to be a coincidence. It aligns with the layout of industrial facilities, the direction of major transportation corridors, and the prevailing pathways of atmospheric pollutant transport. In other words, the geometry of industrialization itself, from factory siting to truck traffic to wind-driven dispersal of dust and emissions, appears to be imprinted on the soil chemistry. Such directional signatures offer a powerful, low-cost tool for identifying pollution pathways and for positioning future monitoring stations where they will capture the most meaningful data.

With the spatial patterns established, the team turned to the central question: what do these concentrations mean for human health? Using a standard health risk assessment framework, they evaluated both non-carcinogenic and carcinogenic risks for adults and children, considering the principal exposure routes of soil ingestion, inhalation, and dermal contact. The non-carcinogenic hazard results were reassuring. For both adults and children, the hazard indices remained within safe limits, indicating that the measured levels of metals in the soils are unlikely to cause adverse non-cancer health effects such as organ damage or developmental toxicity through routine environmental exposure.

The carcinogenic risk calculations, however, delivered the study’s most consequential finding. Nickel, acting chiefly through the ingestion pathway, produced a lifetime cancer risk that surpassed the USEPA’s acceptable threshold in the Attar and Miyanjolgeh estates. Under USEPA guidance, a carcinogenic risk value above the regulatory range suggests that the probability of developing cancer over a lifetime of exposure exceeds what is considered tolerable for the general population. The fact that ingestion, rather than inhalation, emerged as the dominant pathway highlights a particular vulnerability: soil particles enter the body through hand-to-mouth contact, consumption of insufficiently washed produce, and the general incidental ingestion of dust, a route that is especially significant for children who play in contaminated soils.

The researchers emphasize that even modest levels of pollution can translate into long-term health burdens when exposure persists over decades. Nickel compounds are classified as human carcinogens in certain forms, and chronic exposure has been linked to respiratory cancers and other adverse outcomes in occupational settings. The Neyshabur findings suggest that environmental exposure around industrial estates, at concentrations that might appear unremarkable in a single soil sample, can accumulate into a meaningful population-level risk when integrated across a lifetime. This is the essence of the integrated risk assessment approach the study champions: rather than evaluating each metal or pathway in isolation, it combines concentration data, spatial analysis, exposure modeling, and regulatory benchmarks into a single coherent picture of public health vulnerability.

The study also carries important implications for environmental management in Neyshabur and for the many rapidly industrializing regions it resembles. Because nickel and chromium show both natural and industrial contributions, the authors argue that monitoring programs must account for the local geochemical background before attributing exceedances solely to industrial emissions. At the same time, the directional concentration peaks provide actionable intelligence: pollution control efforts, dust suppression measures, and land-use restrictions can be targeted along the identified north–south corridors and around the specific estates where carcinogenic risk is highest. For cadmium, the distance-related gradient points toward agricultural best practices, including fertilizer management, as a complementary lever for reducing soil contamination.

The research was conducted by a team from Neyshabur University of Medical Sciences and Shiraz University of Medical Sciences, with ethical approval under code IR.NUMS.REC.1403.058, and the underlying data are available within the article and its supplementary materials. Its publication comes amid a growing body of work documenting heavy metal contamination in Iranian soils, from urban centers like Isfahan and Yazd to industrial complexes in Zanjan and Arak, and it adds a rigorous spatial and risk-based dimension to that literature. For the residents of Neyshabur, the message is measured but clear: the non-cancer risks from industrial soil pollution remain under control, but the nickel-driven cancer risk near Attar and Miyanjolgeh demands sustained monitoring, targeted intervention, and a management framework that treats soil not as an inert backdrop to industrial growth, but as an active medium through which pollution reaches the human body.

Subject of Research: Heavy metal soil pollution and human health risk assessment around industrial estates in Neyshabur, Iran

Article Title: Integrated health risk assessment and management of heavy metal pollution in industrial estates of Neyshabur, Iran

Article References: Hassanabadi, M., Marufi, N., YazdanDoust, M., Mehralian, M., Rahimimoghadam, S., & Javan, S. (2026). Integrated health risk assessment and management of heavy metal pollution in industrial estates of Neyshabur, Iran. Environmental Geochemistry and Health, 48(15), Article 604. https://doi.org/10.1007/s10653-026-03494-0

Image Credits: AI Generated

DOI: 10.1007/s10653-026-03494-0

Keywords: heavy metals, soil contamination, nickel, chromium, cadmium, health risk assessment, carcinogenic risk, industrial estates, Neyshabur, Iran, spatial analysis, environmental monitoring

Bipolar plates are the workhorses of a PEMFC stack. They separate individual cells, distribute hydrogen and air across the electrode surfaces, carry current from cell to cell, and help manage water and heat. Traditionally, plates were machined from graphite, which is conductive and corrosion-resistant but brittle, thick, and costly to manufacture at volume. Metallic plates, by contrast, can be stamped into thin, intricate flow fields in seconds, making them far lighter and cheaper for automotive applications. The catch is that metals corrode in the acidic, humid environment inside a fuel cell, and the passive oxide films that form on their surfaces are poor conductors. That oxide layer is precisely what drives up interfacial contact resistance, or ICR, the area-specific resistance measured between the plate and the adjacent porous transport layer under the compressive load of stack assembly.

Researchers have explored a zoo of protective coatings to solve this, from physical vapour deposited nitrides to amorphous carbon films. But vapour-phase techniques require expensive vacuum equipment and struggle to coat complex, porous geometries uniformly. Sevinc and Hazar took a different route: a combined aqueous electrodeposition and electrophoretic deposition (EPD) process, carried out entirely in water-based baths. Electrodeposition builds the metallic matrix of the coating, while EPD uses an electric field to drive charged graphene particles toward the substrate, embedding the carbon sheets into the growing film. The approach is low-cost, scalable, and, crucially, compatible with porous structures that vacuum processes cannot easily penetrate.

The team applied their Ni–Cr–Ta–graphene coatings to an unusually broad set of substrates: dense aluminum, dense nickel, and AISI 316L stainless steel, the three most commonly discussed metallic bipolar plate materials, plus porous aluminum and porous nickel structures. Porous flow fields are an emerging design concept in which the conventional machined channels are replaced by an open-pore metal foam, giving vastly more contact area for gas distribution and water management. Coating such structures without clogging the pores is a major challenge, and demonstrating that an EPD-based coating preserves pore accessibility is one of the study’s most practically significant results.

The researchers systematically varied the deposition bath composition, designated S1 through S5, and the deposition time, then examined the resulting surfaces with scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). These techniques revealed how uniformly the coating covered each substrate and how the graphene and metallic elements were distributed. The morphology proved highly sensitive to processing conditions: too short a deposition time left the surface incompletely covered, while excessive deposition produced thicker, less uniform layers. An optimized deposition time of 120 seconds yielded comparatively uniform coatings across the series and delivered the best electrical contact behavior within the investigated set of formulations.

The headline numbers come from the ICR measurements, taken under compressive pressures relevant to real PEMFC stack assembly, up to 140 N/cm². Among all tested formulations, the coating designated S4 achieved the lowest interfacial contact resistance, approximately 78 mΩ cm² at 140 N/cm² on the aluminum substrate. To appreciate how substantial that improvement is, consider the benchmark the team used for comparison: an aluminum specimen pre-coated with nickel alone, representing a conventional baseline, exhibited roughly 269 mΩ cm² under the same conditions. The multi-component graphene-containing coating therefore cut the contact resistance to less than a third of the baseline value, a reduction of nearly 70 percent achieved purely through smarter surface chemistry and processing.

The authors are refreshingly candid about the remaining gap. The U.S. Department of Energy has set a target of 10 mΩ cm² for bipolar plate contact resistance, a figure that reflects what is needed for maximum stack efficiency in mass-market vehicles. Even the best S4 coating remains approximately 7.8 times higher than that target. The study’s results, in other words, represent a relative improvement within the investigated coating series rather than a solved problem. Further optimization of bath chemistry, particle loading, deposition parameters, and possibly post-treatment steps will be required before these coatings can meet the stringent demands of commercial fuel cell stacks. This honesty is valuable in a field where headline numbers sometimes obscure how far laboratory results still sit from deployment thresholds.

Why does adding graphene to a nickel–chromium–tantalum matrix help so much? The answer lies in the complementary roles of each constituent. Nickel provides the conductive metallic backbone and serves as the electroplating medium from the aqueous bath. Chromium contributes corrosion resistance, helping to shield the underlying metal from the acidic PEMFC environment and suppress the growth of insulating oxide films. Tantalum is prized in the bipolar plate literature for its exceptional passivity and stability in simulated fuel cell conditions, and prior studies have shown tantalum-modified stainless steel plates resisting corrosion effectively. Graphene, meanwhile, brings its legendary in-plane electrical conductivity and chemical inertness; sheets distributed through the coating create conductive pathways and can act as a barrier to corrosive species. Together, the four constituents aim to satisfy the two demands that usually trade off against each other: protecting the metal from corrosion while keeping the surface electrically accessible.

The combined electrodeposition–EPD strategy also matters from a manufacturing standpoint. Metal matrix composite coatings produced by co-depositing particles into an electroplated layer are an established and diversifying technology, but systematic studies on Ni–Cr–Ta–graphene systems, particularly on both dense and porous substrates, had remained limited. By showing that the same water-based process works across aluminum, nickel, and stainless steel, and that it coats porous foams while keeping their pores open, the Firat University team has expanded the design space available to fuel cell engineers. Aqueous processing avoids the capital cost and geometric limitations of PVD and CVD chambers, and it integrates naturally with existing electroplating infrastructure in the automotive supply chain.

The work, which draws on the first author’s doctoral dissertation on metal-based flow plates for PEM fuel cells in electric vehicles and was funded by Firat University’s Scientific Research Projects Coordination Unit, arrives at a moment when hydrogen technology is scaling up globally. Every reduction in ohmic loss inside the stack translates directly into more kilometers per kilogram of hydrogen, and bipolar plate coatings are among the most cost-effective levers for achieving that. Sevinc and Hazar’s results demonstrate that aqueous EPD-based Ni–Cr–Ta–graphene coatings provide an effective route to improving electrical contact performance while preserving the pore accessibility that next-generation porous flow fields demand. The DOE target remains the finish line, but this study maps out a credible, low-cost path toward it, one graphene-laden layer at a time.

Subject of Research: Ni–Cr–Ta–graphene composite coatings for reducing interfacial contact resistance of metallic bipolar plates in proton exchange membrane fuel cells

Article Title: Microstructural and contact resistance behavior of Ni–Cr–Ta–graphene coatings on metallic bipolar plate substrates

Article References: Sevinc, H., & Hazar, H. (2026). Microstructural and contact resistance behavior of Ni–Cr–Ta–graphene coatings on metallic bipolar plate substrates. Ionics. https://doi.org/10.1007/s11581-026-07541-9

Image Credits: AI Generated

DOI: 10.1007/s11581-026-07541-9

Keywords: PEMFC, bipolar plate, graphene, electrophoretic deposition, contact resistance, coatings, nickel, chromium, tantalum, corrosion, fuel cells, porous metal

The stakes are higher than corporate paperwork suggests. Battery material purchasers on the open market increasingly compare products using reported ESG data, and downstream manufacturers such as car companies are making procurement decisions based on sustainability disclosures. A review of reports from 90 corporate entities cited in the study found that sustainability disclosures lack completeness, consistency and comparability, with wide variations in reporting practices. Meanwhile, greenwashing has come under formal scrutiny in Australia through an investigation by the Australian Competition and Consumer Commission, raising the reputational cost of vague or inflated claims. If the data underpinning these decisions is not comparable, the entire traceability apparatus built around responsibly produced battery minerals starts to wobble.

The research team used qualitative content analysis to extract information from eight voluntary mechanisms, including certification schemes such as the Initiative for Responsible Mining Assurance (IRMA), Certification of Raw Minerals (CERA), Towards Sustainable Mining (TSM), the Global Reporting Initiative (GRI), the Carbon Disclosure Project (CDP), the Dow Jones Sustainability Index (DJSI) and the Responsible Mining Index (RMI), alongside the OECD Due Diligence Guidance on Stakeholder Engagement. They also examined three Australian federal legislative instruments: the National Greenhouse and Energy Reporting Act 2007, the National Pollutant Inventory measure, and the Environmental Protection and Biodiversity Conservation Act 1999. Each mechanism was assessed against a common set of criteria covering ESG categories addressed, data types required, methodological specifications, whether reporting occurred at site or corporate level, and transparency provisions.

The findings show partial alignment with significant fragmentation underneath. Several topics, including energy use, greenhouse gas emissions, labour practices and community engagement, appeared consistently across mechanisms. Yet the depth and specificity of requirements varied enormously, particularly regarding methodology, data quality and verification expectations. Variance was especially pronounced for water, air quality, climate change, energy, waste, and habitats and mine closure indicators. Even when multiple mechanisms addressed the same category, detailed analysis revealed significant differences in how results were derived and how much information was needed to satisfy reporting expectations.

Some schemes clearly went further than others. IRMA, for example, features highly detailed descriptions and criteria for meeting individual reporting categories, specifies the frequency at which reporting should be updated, and mandates assurance requirements, with surveillance audits conducted 12 to 18 months after initial audits and re-audits every three years. It also requires public reporting of information on company websites. By contrast, GRI’s requirements for evidence supporting reported information are less prominent, and several schemes lacked any mention of public reporting or clarity about what should be disclosed publicly. Compliance grading added another layer of complexity: TSM uses levels from C to AAA, while IRMA scores a percentage based on assurance requirements met, which complicates downstream comparison across standards.

Verification and governance practices diverged just as sharply. The researchers evaluated data quality principles, informed by ISEAL credibility guidelines and prior research linking independent third-party verification to reporting credibility. Only one regulatory instrument, the NGER scheme, required third-party auditing of reported greenhouse gas accounting information. Among voluntary mechanisms, internal and third-party auditing were more prevalent but not uniformly required. DJSI requires third-party verification every four years but not for all information, TSM requires it only for some disclosures, and RMI demands public disclosure of certain data without requiring independent verification of it. On governance, IRMA, TSM, GRI and RMI were all developed under multi-stakeholder governance involving indigenous groups, worker organisations, industry, financial institutions and researchers, while CERA was developed with a limited group of consultants and universities. Only IRMA and CERA specified grievance mechanisms outright, with TSM requiring them for workers.

The study situates this fragmentation in a longer history. Sustainability reporting in mining predates the Global Reporting Initiative, founded in 1997, and stretches back at least as far as Western Mining Corporation’s 1994/95 Environmental Progress Report, developed partly using North American guidelines from 1993. Australia has had mandatory corporate environmental reporting since 1998. Yet despite three decades of evolution, ESG frameworks have not reached a level of standardisation that enables meaningful performance comparison. The International Council on Mining and Metals released a draft Consolidated Mining Standard in October 2024, merging its Mining Principles with the CopperMark, Towards Sustainable Mining and the World Gold Council standards, but the authors caution that whether consolidation solves equivalency, comparability and data quality issues remains to be seen, particularly with implementation due in 2026 and uptake uncertain.

Regulatory pressure is building from multiple directions simultaneously. The European Union’s Battery Regulation will directly affect Australian battery material producers, while the proposed Carbon Border Adjustment Mechanism and the US Securities and Exchange Commission’s climate-related financial disclosure requirements signal a broader shift from voluntary towards mandatory ESG reporting. In Australia, comprehensive ESG disclosure has not yet been mandated beyond modern slavery and greenhouse gas reporting for larger companies, but a government position statement announcing an ‘Extended External Reporting regime’ hints at a future framework. Product-level platforms such as the Global Battery Alliance’s Battery Passport and the London Metal Exchange have responded to traceability demands by mandating specific reporting requirements, though their material scope remains limited.

The researchers sketch two divergent futures. In the consolidation trajectory, the proliferation of standards observed over 30 years reverses, driven by developments such as the International Sustainability Standards Board, which is working to consolidate SASB standards, TCFD recommendations, the Integrated Reporting Framework and the CDSB Framework. Industry-led consolidation is also visible in the international spread of Towards Sustainable Mining, adopted by the Minerals Council of Australia among others, and in the Copper Mark’s adaptation into Molybdenum, Nickel and Zinc Marks in 2022. However, the Consolidated Mining Standard has drawn pushback, with an open letter signed by more than 35 community groups, unions and NGOs advocating for alternatives such as IRMA, which they viewed as developed through an equal governance model, revealing tension between industry and broader stakeholders. In the proliferation trajectory, new standards emerge focused on specific concerns like modern slavery or individual commodities, potentially fragmenting along geographic lines between the USA, China and Europe, though interoperability could improve through blockchain-supported data systems and the United Nations Transparency Protocol, whose test pilots are now underway in Canada, Australia and the Democratic Republic of Congo.

For Australian producers, the immediate reality is a choice between expensive workarounds. Larger companies are building bespoke concordance matrices that align reporting criteria across multiple standards, an approach that demands sizable internal sustainability teams or costly external consultants. Smaller producers, or projects still in the scoping phase, often find that investment exceeds the perceived value. Some companies adopt a single strong standard such as IRMA in the hope that it satisfies others, though the scheme’s rigour can create hesitation among producers wary of unfavourable findings. The study’s authors do not pretend to have an exhaustive picture, acknowledging that the landscape is evolving rapidly and their analysis reflects a specific moment in the FBI CRC project. But their central conclusion is clear: the current landscape exhibits moderate overlap without full standardisation, and this fragmentation risks undermining comparability and stakeholder confidence. They recommend that all stakeholders in battery material supply chains articulate the future they want when advocating for change, because whether the sector consolidates or proliferates, the credibility of every green claim attached to a battery mineral depends on it.

Subject of Research: Comparative analysis of voluntary and regulatory ESG reporting mechanisms for Australian battery mineral producers

Article Title: Battery minerals: a changing context for ESG reporting

Article References: Langdon, R., Berry, F., Lara, H. B., Giurco, D., Northey, S., Severiano, B. M., & Li, W. (2026). Battery minerals: a changing context for ESG reporting. BMC Environmental Science, 3(1), Article 4. https://doi.org/10.1186/s44329-026-00046-w

Image Credits: AI Generated

DOI: 10.1186/s44329-026-00046-w

Keywords: ESG reporting, battery minerals, lithium, nickel, cobalt, mining sustainability, IRMA, greenwashing, supply chain traceability, Battery Passport, Australia, standardisation

Researchers sampled thirty ponds monthly from June to September 2022, dividing them into four categories: agricultural reservoirs, biologically managed habitat ponds, natural ponds with little anthropogenic influence, and engineered urban stormwater ponds of the kind that now number more than 230 in the city of Ottawa alone. These impoundments are designed to capture runoff, trap sediments and shield downstream ecosystems from floods and pollutants, but they can also become nurseries for unwanted cyanobacteria and the cyanotoxins they produce. The team collected water for physical and chemical analysis, identified phytoplankton communities using FlowCam imaging systems, and quantified land use within a one-kilometer buffer around each pond using provincial land cover databases.

The chemical contrast between pond types was striking. Stormwater ponds had the highest specific conductivity, averaging roughly 1,045 microsiemens per centimeter and peaking above 3,000, a signature of road salt application across their largely impervious urban catchments. Agricultural ponds, by contrast, carried the heaviest nutrient loads, with total phosphorus averaging 0.119 milligrams per liter and total Kjeldahl nitrogen 1.876 milligrams per liter, both significantly higher than in any other pond type. Natural ponds remained consistently low in nutrients, salts and metals, buffered by surrounding soils and forest cover. A regression analysis revealed that roughly half the variation in overall water chemistry across all ponds could be explained simply by the percentage of impervious cover, such as roads and pavement, surrounding each pond.

When the researchers turned to the living communities, they found that phytoplankton assemblages were broadly similar across pond types, a reflection of broad ecological niches and effective dispersal among these small water bodies. But the details mattered. Agricultural and managed ponds hosted more chlorophyte green algae and larger cyanobacteria, while stormwater ponds were dominated by small picoplankton-sized cyanobacteria. Variance partitioning showed that environmental factors alone explained nearly 62 percent of the variation in community composition, with the full model accounting for about 70 percent, whereas land use independent of environment explained under 2 percent and season contributed nothing significant. In other words, it is the chemistry of the water, not the calendar or the map alone, that structures who lives in these ponds.

The study’s most provocative findings emerged from its machine learning analysis. Using classification and regression tree modeling, the team predicted cyanobacterial counts from dozens of chemical and land use variables. The first split in the entire dataset was not phosphorus, not temperature, but extractable nickel. Ponds with nickel concentrations above 0.0029 milligrams per liter harbored cyanobacterial densities nearly three times those of the rest, and these nickel-rich samples came almost exclusively from stormwater and agricultural ponds. Nitrate was the closest competing variable, and water temperature, conductivity and ammonia all ranked prominently in the model’s variable importance scores.

Even more striking was what did not matter. Total phosphorus and reactive phosphorus, long cast as the primary villains of cyanobacterial blooms, ranked only tenth or lower in importance, with importance scores of just 4.7 and 4.3. In these moderately disturbed, pre-bloom systems, the classical paradigm of phosphorus control appeared to loosen. Instead, the data pointed to a tight coupling between nickel and nitrogen metabolism. Cyanobacteria rely on the nickel-dependent enzyme urease to hydrolyze urea into ammonia and carbon dioxide, providing a bioavailable nitrogen source, and the co-occurrence of elevated nickel and ammonia in the CART hotspots is consistent with enhanced urease activity under urban contamination regimes.

The urban provenance of the nickel itself is well documented in the broader literature. Copper and zinc wash from vehicles, brake wear, tires, road surfaces and buildings, while nickel contamination traces to fossil fuel combustion, construction activity and waste disposal. Stormwater ponds, ringed by asphalt and receiving concentrated runoff, accumulate these metals readily, and the study found copper, zinc and nickel positively associated with cyanobacterial concentrations in urban ponds. At the moderate concentrations observed, nickel appears to act as a micronutrient rather than a toxin, though at higher levels it inhibits photosynthesis, promotes reactive oxygen species and can even stimulate toxin production in sensitive species.

Conductivity also emerged as a meaningful predictor, with cyanobacteria strongly associated with specific conductance above 1,184 microsiemens per centimeter, a threshold dominated by stormwater and managed ponds. While salts are generally treated as indirect indicators of landscape runoff rather than direct bloom drivers, the finding echoes earlier work showing that elevated ionic concentrations correlate with cyanobacterial and periphyton abundance in both natural and disturbed systems. Warm summer temperatures, peaking near 24 degrees Celsius in July, amplified the model’s predictive power, consistent with the widely observed synergy between warming and nutrient or contaminant loading.

The study confirmed that cyanobacteria fare disproportionately well in chemically and physically altered systems: the highest concentrations occurred in stormwater and agricultural ponds, while natural ponds, though biologically diverse, hosted the fewest. Although classical surface blooms were not observed during the sampling season, the team documented elevated numbers of potentially harmful taxa, including Microcystis and small coccoid cyanobacteria, in the modified ponds. This pre-bloom state is precisely where early-warning signals matter most, and the authors argue that nickel-mediated nitrogen processing could be an overlooked early driver of eutrophication before blooms become visible.

The practical implications are considerable. Managing cyanobacteria has long focused on curbing point-source phosphorus, capping nitrogen inputs and altering water flows, approaches that are often blunt and only partially effective against diffuse non-point pollution. This research suggests that in constructed ponds, the micronutrient dimension of contamination, and specifically the role of nickel in nitrogen cycling, deserves a place in monitoring and design strategies. As urbanization expands and climate change intensifies runoff, the humble stormwater pond may prove to be both a sentinel and a trigger in the global rise of harmful algal blooms, and the trace metals that trickle off our roads may be quietly shaping which microbes thrive in the waters we build.

Subject of Research: Anthropogenic and environmental factors driving plankton communities and cyanobacteria in constructed ponds and wetlands.

Article Title: Anthropogenic and environmental factors driving planktic community and Cyanobacteria selection in constructed ponds and wetlands

Article References: Schulz, N. A., Hamilton, P. B., Lapen, D., Sunohara, M., & Vermaire, J. C. (2026). Anthropogenic and environmental factors driving planktic community and Cyanobacteria selection in constructed ponds and wetlands. Environmental Advances, 25, Article 100752. https://doi.org/10.1016/j.envadv.2026.100752

Image Credits: AI Generated

DOI: 10.1016/j.envadv.2026.100752

Keywords: cyanobacteria, harmful algal blooms, stormwater ponds, nickel, nitrogen, phosphorus, phytoplankton, urease, urban runoff, water quality, machine learning, constructed wetlands

The research team set out to answer a deceptively simple question: when hydrogen gas bubbles off a nickel electrode in an alkaline solution, which of the surface species that form on nickel is actually doing the catalytic work? Nickel electrodes in alkaline media are never chemically naked. Depending on the applied potential and local conditions, their surfaces can host nickel oxide, nickel hydroxide, and nickel hydride phases, each with distinct electronic structures and bonding geometries. For decades, researchers have debated whether these species are innocent bystanders, harmful blockers, or hidden active sites. Because real electrodes present a patchwork of all three, isolating their individual contributions has been extraordinarily difficult.

The breakthrough of the new work lies in its systematic approach to well-defined nickel surfaces. Rather than studying polycrystalline foams or nanoparticles, where grain boundaries and defects confound interpretation, the researchers prepared carefully controlled nickel surfaces and deliberately generated each candidate species under known conditions. By systematically varying the presence and coverage of nickel oxide, nickel hydride, and nickel hydroxide, and then measuring the hydrogen evolution activity of each configuration, they could assign catalytic roles with a clarity that previous ensemble measurements could not achieve. The strategy echoes a classic theme in surface electrochemistry: only when a surface is well defined can the link between structure and function be drawn unambiguously.

What emerged is a picture in which no single species can claim sole credit. Nickel oxide species, the team found, contribute to the reaction in ways that depend sensitively on their exact chemical state and distribution on the metallic surface. Nickel hydroxide, which forms readily in alkaline environments and has often been invoked as the key promoter of alkaline hydrogen evolution, plays a role that must be carefully separated from the contributions of the oxide and hydride phases. Meanwhile, nickel hydride, the species formed when adsorbed hydrogen penetrates the metal lattice or binds in hydride-like configurations, emerges as a central participant in the hydrogen formation chemistry itself. The study’s central achievement is showing how these three species interact and divide the labor of the reaction rather than acting in isolation.

The distinction matters enormously for the alkaline hydrogen evolution reaction because its mechanism differs fundamentally from the one that operates in acid. In acidic media, the reaction proceeds through adsorbed hydrogen atoms that form directly on the metal surface and combine into hydrogen molecules. In alkaline electrolytes, however, water itself is the proton source, so every hydrogen molecule produced requires a water molecule to dissociate on the surface, cleaving an O-H bond and liberating a hydroxide ion. This initial water dissociation step is widely regarded as the kinetic bottleneck on pure metals, and it is precisely where adjacent oxide or hydroxide species have been proposed to help, by offering oxygen-affine sites that cleave water while neighboring metallic sites assemble the hydrogen. The new results put this bifunctional picture on a much firmer experimental footing for nickel.

For the electrolyser industry, the implications are immediate. Alkaline water electrolysis is the most mature and lowest-cost electrolysis technology on the market, but its cathodes and anodes still trail the performance achievable with platinum-group catalysts. Nickel is already the workhorse electrode material in commercial alkaline electrolysers, prized for its corrosion resistance in concentrated potassium hydroxide and its reasonable activity. If engineers can now identify which surface species to stabilize—and in what proportion—they can rationally tune electrode preparation protocols, whether through surface oxidation treatments, controlled potential cycling, or the deliberate engineering of oxide-hydride interfaces, instead of relying on empirical trial and error. The study effectively converts a long-standing controversy into an engineering design principle.

The findings also carry weight for the broader search for precious-metal-free catalysts. Earth-abundant transition metals such as nickel, cobalt, iron, and molybdenum have all been explored as hydrogen evolution catalysts, and many of the most successful candidates are not pure metals at all but composites in which metallic domains coexist with oxide or hydroxide phases. The nickel study provides a conceptual template for deconvoluting such systems: prepare well-defined versions of each phase, measure their individual kinetics, and then interrogate their combinations. Applied across the periodic table, this methodology could accelerate the discovery of catalysts that match platinum’s performance at a fraction of the cost, a goal that would ripple through green hydrogen production, fuel cells, and carbon-neutral synthesis of fuels and chemicals.

There are also cautionary lessons in the results. Because nickel hydride participates directly in the reaction, the subsurface and bulk hydride chemistry of nickel electrodes deserves renewed attention, particularly under the strongly reducing potentials of cathodic operation where hydride formation is thermodynamically favored. Hydride formation can induce lattice strain, alter electronic properties, and even degrade electrode morphology over time, so understanding its catalytic role may simultaneously illuminate pathways to more durable electrodes. Similarly, the finding that oxide and hydroxide species make separable, state-dependent contributions suggests that the dynamic potential-dependent evolution of surface chemistry during electrolyser start-up, shutdown, and fluctuating renewable power input could shift which species dominates, with consequences for both efficiency and lifetime.

The study arrives at a moment when green hydrogen is scaling from demonstration projects to gigawatt deployments, and every millivolt saved at the cathode translates into real energy and cost savings at industrial scale. By systematically dissecting the individual roles of nickel oxide, nickel hydride, and nickel hydroxide on well-defined nickel surfaces, the researchers have replaced a murky, contested narrative with a mechanistically grounded one. The work does not end the search for better alkaline hydrogen evolution catalysts, but it decisively sharpens it: the target is no longer simply nickel, or nickel oxide, or nickel hydroxide, but the precisely engineered coexistence of all three. For a field racing to strip precious metals out of the hydrogen economy, that clarity may prove as valuable as any single catalyst.

Subject of Research: The individual roles of nickel oxide, nickel hydride, and nickel hydroxide surface species in the alkaline hydrogen evolution reaction on nickel electrodes.

Article Title: The role of individual nickel surface species in the hydrogen evolution reaction on nickel in alkaline electrolytes

Article References: Kozlica, D. K., Finšgar, M., Farinazzo Bergamo Dias Martins, P., Huš, M., Genorio, B., Connell, J. G., Martins, M., Hývl, M., Žibert, T., Andrina Varda, K., Osmić, A., Bele, M., Likozar, B., Tomc, B., Gaberšček, M., & Strmčnik, D. (2026). The role of individual nickel surface species in the hydrogen evolution reaction on nickel in alkaline electrolytes. Nature Catalysis. https://doi.org/10.1038/s41929-026-01605-9

Image Credits: AI Generated

DOI: 10.1038/s41929-026-01605-9

Keywords: hydrogen evolution reaction, nickel, alkaline electrolytes, water electrolysis, nickel oxide, nickel hydride, nickel hydroxide, electrocatalysis, green hydrogen, surface chemistry, precious-metal-free catalysts, Nature Catalysis