Decoupling fast hydrogen oxidation reaction on a tandem electrocatalyst.

IF 15.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Nature Communications Pub Date : 2025-07-22 DOI:10.1038/s41467-025-62160-8

Wei Guo, Guoqiang Zhao, Ziang Sun, Bingxing Zhang, Dongyue Xin, Mingxia Gao, Yongfeng Liu, Zhongbin Zhuang, Hai-Wei Liang, Hongge Pan, Wenping Sun

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Abstract

The hydrogen oxidation reaction (HOR) shows fast kinetics in proton exchange membrane fuel cells (PEMFCs), and has not drawn intense attention. Here, we propose a tandem electrocatalysis concept, decoupling HOR on two independent active sites for accelerated kinetics. As a proof-of-concept application, a Ru-based tandem HOR catalyst is designed, with Ru nanoclusters decorated with Pt single atoms. Experimental and theoretical studies suggest that H₂ dissociation occurs at Ru sites, and then the produced H species migrate to Pt sites followed by the desorption of H⁺. The strong Ru-H interaction promotes the H₂ dissociation step, while the optimum Pt-H interaction ensures the fast desorption, thereby substantially enhancing the HOR kinetics. In H₂-O₂ fuel cells, this catalyst enables a peak power density of 1.91 W cm^-2 and a high anodic mass activity of 23.12 A mg^-1 at 0.9 V_iR-free with an ultralow noble metal loading of 5 μg cm^-2. This work advances the development of low-cost anode catalysts for fuel cells and provides more insight into understanding hydrogen electrocatalysis.

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串联电催化剂上的解耦快速氢氧化反应。

质子交换膜燃料电池（PEMFCs）中氢氧化反应（HOR）具有快速动力学，但尚未引起广泛关注。在这里，我们提出了串联电催化的概念，将HOR在两个独立的活性位点上解耦以加速动力学。作为一种概念验证应用，我们设计了一种Ru基串联HOR催化剂，Ru纳米团簇用Pt单原子修饰。实验和理论研究表明，H2在Ru位点发生解离，生成的H迁移到Pt位点，H+被解吸。强的Ru-H相互作用促进了H2的解离步骤，而最佳的Pt-H相互作用确保了快速的脱附，从而大大提高了HOR动力学。在H2-O2燃料电池中，该催化剂可实现1.91 W cm-2的峰值功率密度和23.12 a mg-1的高阳极质量活性，在0.9 virfree下，超低贵金属负载为5 μg cm-2。这项工作推动了燃料电池低成本阳极催化剂的发展，并为理解氢电催化提供了更多的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nature Communications Biological Science Disciplines-

CiteScore

24.90

自引率

2.40%

发文量

6928

审稿时长

3.7 months

期刊介绍： Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.