The team, led by Assistant Professor Andrew Barnabas Wong of the Department of Materials Science and Engineering, has engineered an elegant solution by harnessing biopolymers—naturally derived, biodegradable materials sourced from biological waste such as seafood shells, wood, and insect exoskeletons—to enhance copper catalyst performance in CO2 electroreduction. By applying ultrathin coatings of these materials, just two to five nanometres thick, on copper surfaces, the researchers achieved unprecedented selectivity for multicarbon products at industrially relevant current densities. Specifically, the system attained a remarkable 90% selectivity at 1.6 amperes per square centimetre and maintained an 83% selectivity rate even when pushed to 2.2 A/cm², surpassing most current copper-based catalytic benchmarks.

Electrochemical CO2 conversion operates by utilizing renewable electrical energy to split CO2 and water molecules into their constituent atoms and then reconstituting them into valuable hydrocarbon products. Copper catalysts are pivotal in this process, given their unique ability to facilitate the formation of multicarbon compounds, including ethylene and ethanol, which are fundamental to the global chemical and fuel industries. Historically, achieving high selectivity for these products necessitated coating copper electrodes with fluorinated ionomers like Nafion, renowned for their water-repellent and ionic transport properties. However, Nafion and related materials belong to the class of per- and polyfluoroalkyl substances (PFAS)—commonly known as “forever chemicals”—which are environmentally persistent, expensive, and increasingly subject to regulatory scrutiny due to health hazards.

The innovation by Wong’s group replaces these PFAS with nanolayers of biopolymers, namely cellulose, chitin, and chitosan. These biopolymers not only avoid environmental and health concerns associated with PFAS but also fundamentally alter the local reaction microenvironment at the catalyst interface. Through advanced spectroscopic techniques and computational modeling, the researchers demonstrated that biopolymer coatings increase local CO2 concentration near the catalyst surface, restrict the diffusion of water molecules, and promote efficient ion transport. These synergistic effects significantly suppress the hydrogen evolution reaction—a common undesired side reaction that consumes electrons and decreases the yield of carbon-based products—thereby steering the reaction towards higher production of multicarbon hydrocarbons.

Assistant Professor Wong commented that their findings challenge long-held assumptions in the field, where hydrophobic materials were thought essential for maintaining selectivity during CO2 reduction. In contrast, the biopolymer coatings are highly hydrophilic, interacting strongly with water molecules and reshaping the electrochemical environment to favour the catalytic pathways leading to ethanol and ethylene. This novel understanding opens an exciting new frontier in catalyst design, where the microenvironment created by the coating can be fine-tuned to optimize performance.

In addition to enhancing selectivity and efficiency, the team showcased the practical advantages of biopolymer coatings as multifunctional components in electrodes. When paired with silver nanoparticles to form a tandem system, the biopolymer-coated copper catalysts demonstrated substantial stability and activity at elevated current densities — conditions that simulate industrial operations demanding high throughput. Notably, performance metrics retained their high selectivity for multicarbon products, which would typically deteriorate at higher currents due to increased hydrogen generation.

The cost benefits are equally compelling. Chitosan, for example, is produced from abundant waste biomaterials at a price point approximately three orders of magnitude lower than Nafion per kilogram. This dramatic reduction in material cost, combined with the elimination of environmentally problematic PFAS components, promises to deliver a greener, more economically viable pathway for scalable CO2 electroreduction technologies. Such affordability and sustainability are critical for real-world deployment and transitioning away from fossil-based fuel and chemical production.

Beyond immediate performance gains, the use of biopolymers derived from waste streams embodies circular economy principles, transforming biological refuse into a value-added resource that advances climate-positive technology. This alignment of environmental benefits, economic feasibility, and technological innovation illustrates a holistic approach to sustainable energy conversion.

While the technology is still evolving, the potential impact of this research resonates throughout the chemical energy landscape. Electrochemical CO2 conversion powered by renewables offers an avenue to produce essential fuels and feedstocks while capturing and utilizing carbon emissions, a key pillar in mitigating climate change. The biopolymer-coated copper catalyst represents a crucial step in overcoming existing bottlenecks in efficiency and sustainability that have hindered commercialization.

Future research directions, as outlined by the researchers, include fine-tuning the biopolymer compositions and thicknesses to adjust the ratios of different multicarbon products like ethanol versus ethylene — a critical factor for matching varied industrial demands. Enhancing the long-term stability of the electrodes to extend operational lifetimes without substantial maintenance is also a priority. These ongoing efforts promise further advances, potentially enabling truly oil-free manufacturing of fuels and chemicals on an industrial scale.

This discovery stands out not just for its technical ingenuity but for its broader implications: a simple, scalable coating strategy capable of transforming CO2 electroreduction by eliminating reliance on harmful synthetic ionomers. As the world accelerates toward net zero emissions and decarbonization, innovations such as this from the NUS team spotlight the intersection of materials science, chemistry, and sustainability. They offer tangible hope for reshaping energy systems to be cleaner, cheaper, and more circular.

Subject of Research:
Not applicable

Article Title:
A scalable, biopolymer-based microenvironment for electrochemical CO2 conversion to multicarbon products with current densities over 2 A cm−2

News Publication Date:
April 17, 2026

Web References:
http://dx.doi.org/10.1038/s41560-026-02040-7

Image Credits:
College of Design and Engineering, National University of Singapore

Keywords

Energy, Materials Science, Chemical Engineering, Sustainability, Nanotechnology, Climate Change Mitigation

Plastics are omnipresent in modern society, yet their production is a significant contributor to greenhouse gas emissions. Traditional manufacturing processes rely heavily on fossil-derived feedstocks, which not only deplete finite natural reserves but also lock in a carbon-intensive lifecycle. The study underscores that addressing this challenge requires systemic shifts spanning feedstock sourcing, polymer synthesis, and end-of-life management of plastic materials. By focusing on biogenic resources—organic materials derived from renewable biological sources—the researchers map out an ambitious but attainable transition to a circular and low-carbon plastics economy.

Central to the investigation is the classification and assessment of various biogenic feedstocks, ranging from agricultural residues and forestry byproducts to emerging platforms such as algae and microbial biomass. These materials are abundant and replenish naturally, enabling a sustainable carbon loop when managed effectively. Van Roijen and Miller emphasize that the selection of appropriate feedstocks must consider competing land uses, biodiversity preservation, and food production security. Their model integrates these concerns, thereby ensuring that scaling biogenic plastic production avoids unintended ecological trade-offs.

Technological innovation forms the backbone of this transformation. The study highlights the development of advanced bioconversion processes that convert biomass into platform chemicals and monomers suitable for polymerization. These include enzymatic fermentation, catalytic upgrading, and tailored pyrolysis techniques, each optimized to maximize yield and minimize energy inputs. The integration of such technologies into existing industrial infrastructures presents both a challenge and an opportunity to retrofit or redeploy manufacturing capabilities towards greener alternatives.

A crucial aspect of the decarbonization strategy involves the polymer chemistry domain. The authors analyze the potential of biobased polymers not only to substitute for fossil-derived plastics but also to exhibit enhanced material properties and recyclability. Innovations in copolymer synthesis and biodegradable polymers are explored as pathways to reduce persistent plastic pollution alongside carbon emissions. This dual focus on climate and waste management aligns with broader sustainability goals and regulatory pressures emerging worldwide.

Economic and policy frameworks are indispensable to catalyze this systemic change. Van Roijen and Miller present an integrated scenario analysis with policy levers such as carbon pricing, subsidies for biogenic feedstock cultivation, and incentives for circular economy practices. They argue that coordinated global efforts, particularly in harmonizing regulations and investing in research and development, will accelerate the adoption of biogenic plastics. The study’s roadmap appeals to multidisciplinary stakeholders, from governments and industry players to consumers and environmental NGOs.

Importantly, the study delves into the lifecycle assessment of biogenic plastic pathways, quantifying not only greenhouse gas emissions but also energy consumption, water use, and land tenure impacts. This holistic approach reveals significant net reductions in carbon intensity—up to 70-90% relative to current fossil-based plastics—when biogenic feedstocks are managed sustainably. The authors advocate for transparent and robust certification schemes to verify biogenic content and lifecycle emissions, ensuring market confidence and accountability.

In the realm of supply chain logistics, the transition to biogenic plastics entails complex adjustments. Agricultural feedstock collection, transport, and storage infrastructures must evolve to accommodate diverse and sometimes geographically dispersed biomass sources. The study models optimization strategies leveraging digital technologies and decentralized processing units to enhance efficiency and reduce emissions related to logistics. These innovations promise to mitigate some of the scalability risks associated with biogenic resource supply.

The authors also address the social dimensions of this green transition. Community engagement is critical, especially in regions where biomass cultivation could impact livelihoods and land use customs. Strategies for fair benefit sharing, workforce retraining, and rural development are discussed as integral elements of just sustainability. The narrative transcends pure techno-economic considerations and acknowledges the societal imprint inherent to any large-scale energy and material transition.

Climate models incorporated in the study further illuminate the potential contribution of biogenic plastics to global net-zero pathways. By embedding plastic decarbonization within broader energy and land-use transformations, Van Roijen and Miller demonstrate synergies that amplify overall climate mitigation efforts. This integrated perspective is vital, as plastics represent a significant fraction of the global carbon challenge but also intersect with agriculture, forestry, and waste management sectors.

The feasibility of the proposed pathway is scrutinized through sensitivity analyses encompassing technological innovation rates, policy adoption trajectories, and market dynamics. The results reinforce the robustness of biogenic feedstocks as a linchpin for plastic decarbonization, contingent on sustained investments and international collaboration. The study lays bare the risks of business-as-usual scenarios, where fossil plastic dominance would exacerbate climate crises and resource depletion.

Intriguingly, the authors speculate on future scenarios where next-generation bioplastics might outcompete conventional ones not only on sustainability metrics but also in cost and performance. They envisage a future circular economy where plastics are designed with end-of-life in mind, aligned with recycling infrastructures and biodegradation pathways. This paradigm shift would redefine value chains and consumer expectations regarding plastic products.

The communication of these insights aligns with a surge of public and political awareness concerning the planet’s plastic problem. By translating complex scientific modeling into actionable policy recommendations, Van Roijen and Miller’s work is poised to influence decision-making at the highest levels. Their vision resonates with international climate commitments such as the Paris Agreement and emerging frameworks targeting plastic pollution reduction.

This study is emblematic of a broader trend where interdisciplinary research guides transformative sustainability agendas. It exemplifies how materials science, biotechnology, economics, and environmental policy can converge to tackle one of the most persistent and pervasive challenges of the 21st century. The plastic problem has long seemed intractable, but this work injects a sense of urgency paired with hopeful pragmatism.

In conclusion, the pathway delineated by Van Roijen and Miller offers a scientifically rigorous and socially conscious blueprint for global plastic decarbonization by 2050. Rooted in the harnessing of biogenic resources, supported by technological innovation, and sustained by coherent policy action, the vision outlined is both comprehensive and inspiring. As the world grapples with climate change, this research illuminates a critical frontier where climate action intersects with materials innovation, promising a more sustainable and resilient future.

Subject of Research: Global plastic decarbonization through biogenic resources and sustainable materials.

Article Title: Leveraging biogenic resources to achieve global plastic decarbonization by 2050.

Article References:
Van Roijen, E., Miller, S.A. Leveraging biogenic resources to achieve global plastic decarbonization by 2050. Nat Commun 16, 7659 (2025). https://doi.org/10.1038/s41467-025-62877-6

Image Credits: AI Generated