Hydrogen, widely championed as a cornerstone of future carbon-neutral energy systems, demands innovative storage and transport solutions to facilitate its direct use across industries. Conventional approaches—such as high-pressure hydrogen gas cylinders or liquefaction—pose significant safety risks and economic drawbacks. Liquid Organic Hydrogen Carriers (LOHCs) emerge as compelling alternatives, enabling hydrogen to be chemically bonded and transported in liquid form with ease comparable to traditional fuels. However, the industry’s Achilles heel remains the dehydrogenation step, which necessitates highly efficient and durable catalysts to liberate hydrogen at the point of demand, efficiently and economically.

Addressing this critical challenge, the research collective developed a ligand-free platinum cluster catalyst engineered with exquisite control over atomic composition and cluster size. Employing a sophisticated air calcination technique, the team immobilized platinum atoms directly onto alumina supports, prompting self-assembly into ultrasmall, amorphous clusters roughly 1 nanometer in size—structures optimized for superior catalytic function. Rapidly achieving uniform cluster formation was essential, as previous catalyst systems either exhibited poor metal utilization efficiency (in the case of nanoparticles) or suffered from inadequate stability (typical of single-atom catalysts).

Advanced electron microscopy investigations revealed a surprising revelation: clusters of similar physical dimensions could consist of varying atom counts—ranging between 13 and 31 platinum atoms per cluster. This atomic variability alters catalytic behavior significantly, indicating that not just cluster size but precise atomic composition dictates activity and durability. Such nuanced understanding enables precise tailoring of catalysts, enhancing reactivity while extending operational lifespans under demanding reaction conditions.

The catalyst’s performance metrics are unprecedented. When deployed for the dehydrogenation of methylcyclohexane, an exemplar LOHC, the catalyst delivers an extraordinary hydrogen production rate of approximately 50,285 mmol per minute per gram of platinum. This translates to roughly 160 hydrogen molecules generated every second per platinum atom—a world-leading efficiency that outperforms conventional commercial catalysts by an order of magnitude, despite using ten times less platinum. This breakthrough not only advances catalytic science but also signals significant economic advantages by dramatically reducing reliance on scarce and costly noble metals.

Complementing experimental findings, comprehensive ab initio computational modeling provided atomic-scale insights into the dynamic behaviors underpinning enhanced catalytic activity and stability. These simulations track atomistic interactions and molecular transitions, offering predictive power to rationalize how the exact number of atoms within a cluster governs reaction kinetics and catalyst robustness. This synergy between theory and experiment exemplifies modern catalyst design paradigms, where precision at the atomic level translates into macroscopic technological gains.

Crucially, the team demonstrated the catalyst’s scalable synthesis, producing uniform platinum clusters at tens-of-gram quantities through a singular laboratory procedure with no theoretical upper scaling limit. This capacity addresses a common bottleneck in nanoparticle and cluster catalyst commercialization, where gram-scale production often limits industrial transition. The method’s adaptability across metal-support combinations beyond the platinum/alumina system further broadens its applicability, opening pathways for diverse catalytic processes demanding minimized precious metal content.

By circumventing the formation of platinum aggregates and inactive single atoms, the innovative air calcination and hydrogen reduction approach yields highly dispersed and strongly anchored cluster catalysts. This design enhances durability under cyclic reaction conditions typical of LOHC dehydrogenation, where catalyst degradation hampers long-term operational viability. In effect, the catalyst exemplifies an ideal balance of activity, selectivity, and lifetime—parameters critical for industrial hydrogen infrastructure.

Prof. Jungwon Park articulates the broader impact of these findings: “This study exemplifies a strategic innovation that transcends conventional catalyst limitations, enabling uniform cluster catalysts with outstanding hydrogen production activity and stability, utilizing near-minimal platinum loadings.” He emphasizes the foundational role of atomic-level structural control, which paves the way for scalable, high-efficiency hydrogen production catalysts essential for advancing LOHC technologies globally.

Moving forward, first author Dr. Chyan Kyung Song continues to refine cluster synthesis and characterization techniques, aiming to extend atomically precise catalysts toward other challenging reactions, including diverse hydrogen generation pathways. Co-first author Dr. Junhyeok Jung, with roots at SNU and now contributing pioneering work at Samsung Electronics, symbolizes the fruitful intersection of academia and industry necessary for technological maturation.

This research effort received support from South Korea’s National Research Foundation’s Top-Tier Research Institution Collaboration Platform and H2 NEXT ROUND Program, underscoring national investment priorities in future energy solutions. With a scalable, cost-effective, and high-performance catalyst platform now realized, the prospect of clean hydrogen supply chains anchored on LOHC systems grows markedly brighter. The technology’s implications ripple through energy economics, environmental sustainability, and industrial practice, signaling a new era in the pursuit of carbon-neutral societies.

Seoul National University’s College of Engineering, a revered leader in scientific innovation with over 70 years of history, continues to drive frontiers in industrial and environmental technologies. Home to over 300 internationally acclaimed faculty members, the college’s commitment to excellence is reflected in pioneering contributions such as this atomically controlled platinum cluster catalyst—a beacon of next-generation clean energy materials science.

Subject of Research: Not applicable

Article Title: Dependence of catalytic properties of strongly supported platinum clusters with atom counts

News Publication Date: 28-May-2026

Web References: DOI: 10.1126/science.aeb3087

Image Credits: © Science, originally published in Science

Keywords

Hydrogen production, platinum cluster catalyst, atomic-level control, liquid organic hydrogen carriers (LOHCs), catalyst stability, catalyst scalability, catalytic activity, air calcination, nanoclusters, sustainable energy, carbon neutrality, noble metal minimization

LOHCs have emerged as front-runners in the quest for practical hydrogen storage and transportation due to their high volumetric hydrogen density and ease of handling under ambient conditions. However, the catalytic dehydrogenation step—where stored hydrogen is released—remains a bottleneck due to inherent inefficiencies and excessive energy demands. Platinum-based catalysts have stood out for their unmatched ability to activate C–H bonds, indispensable in driving hydrogen release from LOHC molecules. Yet, despite their prominence, the influence of the Pt electronic environment modulated by different oxide supports on catalytic activity has eluded comprehensive understanding, particularly under uniform particle size conditions.

Addressing this knowledge gap, the researchers fabricated an array of Pt/MOₓ catalysts, carefully supported on six distinct oxides: CeO₂, MgO, ZrO₂, TiO₂, Al₂O₃, and SiO₂. The preparation protocol was meticulously designed to produce Pt nanoparticles of a consistent size, around 1.7 nanometers, ensuring that catalyst geometry did not confound electronic effects. Moreover, the oxide supports were controlled within a size range of 20 to 50 nanometers. This strategic design allowed the team to isolate and probe the intrinsic electronic metal–support interactions that dictate catalytic behaviors.

Characterization by a suite of advanced spectroscopic techniques provided compelling evidence of progressive modulation of Pt d electron density as a function of the oxide support. Real-time in situ X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge structure (XANES) spectroscopy revealed continuous shifts in the binding energies of Pt 4f and 4d orbitals. These shifts directly correlated with varying intensities of the white-line features at the Pt L₃ edge. Complementary in situ CO adsorption diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) further substantiated these electronic variations, confirming that supports ranging from SiO₂ to CeO₂ induced a descending order of d electron density on Pt nanoparticles.

Catalytic tests performed on two prominent LOHC molecules—perhydro-monobenzyltoluene/monobenzyltoluene (H12-MBT/H0-MBT) and perhydro-dibenzyltoluene/dibenzyltoluene (H18-DBT/H0-DBT)—unearthed a striking volcano-shaped relationship between the Pt d electron density and the dehydrogenation turnover frequency (TOF). This hallmark volcano trend illuminated that neither too high nor too low d electron densities are conducive for optimal catalytic performance. Notably, Pt supported on MgO stood out with the highest catalytic activity and remarkable stability during prolonged operational testing. In contrast, Pt on SiO₂ exhibited the lowest activity, underscoring the profound impact of the support’s electronic influence.

Long-term durability assessments revealed that Pt/MgO not only sustained its activity but also showed significantly less coke accumulation—a common deactivation pathway—compared to other tested catalysts. This resistance to deactivation demonstrates that electronic tuning via MgO support can extend catalyst life and reduce operational costs, a vital consideration for industrial applications.

To decipher the underpinning atomic-level mechanisms, the team employed density functional theory (DFT) simulations targeting the Pt-support electronic interplay and its consequences on intermediate adsorption and reaction energetics. The calculations disclosed that moderate reduction in Pt d electron density, as epitomized by Pt/MgO, enhances the bonding orbital interactions of Pt–C bonds, fostering the stable adsorption of H6-MBT intermediates. This electronic environment lowers the activation energy barrier for the initial C–H bond cleavage — the rate-limiting step of the dehydrogenation process — resulting in augmented catalytic kinetics.

Conversely, an excessive depletion of d electron density, as observed in Pt/CeO₂ catalysts, diminishes the Pt–C bonding strength, perturbing the adsorption stability of intermediates and escalating the activation energy required for C–H activation. This insight uniquely correlates electronic properties to catalytic inefficiencies, providing a blueprint for tailoring metal-support systems for superior activity.

The significance of this study transcends the immediate breakthroughs in LOHC catalytic dehydrogenation. By establishing a direct correlation between Pt d electron density and catalytic performance, it paves the way for rational design of catalysts through deliberate electronic structure engineering. Such design principles will be pivotal in advancing hydrogen storage technologies to meet the rigorous demands of a hydrogen-powered energy future.

In conclusion, the reported research represents a transformative stride toward unlocking the full potential of LOHCs as viable hydrogen carriers. The precision modulation of Pt electronic states elucidated in this work offers a promising strategy to overcome key limitations in hydrogen release kinetics, stability, and energy efficiency. As global energy frameworks strive for sustainable and secure alternatives, breakthroughs of this nature lay the scientific foundation for scalable and economically feasible hydrogen infrastructures.

This pioneering work, titled “Rational Modulation of Pt d Electrons to Significantly Enhance the Catalytic Dehydrogenation Performance of Liquid Organic Hydrogen Carriers,” was presented by Chao Sun, Tianzuo Wang, Ruijie Gao, Xiaoyang Liu, Kang Xue, Chengxiang Shi, Xiangwen Zhang, Lun Pan, and Ji-Jun Zou. Their comprehensive paper not only delivers compelling experimental evidence but also integrates theoretical insights to deepen understanding of metal-support electronic coupling influences on catalytic outcomes.

The full open-access article can be explored at the URL: https://doi.org/10.1016/j.eng.2025.07.045. This resource promises to be invaluable for researchers, engineers, and policymakers converging on the frontier of hydrogen energy materials and catalytic science.

Subject of Research: Catalytic dehydrogenation of liquid organic hydrogen carriers through electronic structure modulation of platinum catalysts.

Article Title: Rational Modulation of Pt d Electrons to Significantly Enhance the Catalytic Dehydrogenation Performance of Liquid Organic Hydrogen Carriers

News Publication Date: 17-Feb-2026

Web References:

• https://doi.org/10.1016/j.eng.2025.07.045
• https://www.sciencedirect.com/journal/engineering

Image Credits: Chao Sun, Tianzuo Wang et al.

Keywords: Platinum catalysts, Liquid organic hydrogen carriers, Dehydrogenation, Electronic metal-support interaction, d electron modulation, Density functional theory, Hydrogen storage, Catalyst stability, C–H bond activation, MgO support, CeO₂ support, Catalytic activity