Highly Distorted High-Entropy Alloy Aerogels for High-Efficiency Hydrogen Oxidation Reaction

IF 15.8 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

ACS Nano Pub Date : 2025-04-01 DOI:10.1021/acsnano.5c02198

Hanjun Li, Fulin Yang, Guanghua Wang, Liheng Guan, Feili Lai, Nan Zhang, Tianxi Liu

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Abstract

The development of efficient electrocatalysts for alkaline hydrogen oxidation reaction (HOR) is essential for anion exchange membrane fuel cells and advancing the hydrogen economy. Herein, we demonstrated PtRuRhPdIr high-entropy alloy aerogels (HEAAs) with highly distorted structure as efficient HOR electrocatalysts and realized effective control of PtRu-based metallic aerogels (MAs) with elemental components ranging from two to seven. Specially, PtRuRhPdIr HEAAs on carbon (PtRuRhPdIr HEAAs/C) exhibit excellent HOR activity, with Pt group metal (PGM)-normalized mass activity (5.75 A mg_PGM^–1) at 50 mV and exchange current density normalized by electrochemical surface area (0.69 mA cm^–2), approximately 16.9 and 4.1 times that of the commercial Pt/C (0.34 A mg_PGM^–1, 0.17 mA cm^–2), respectively. The mechanism study shows that the highly distorted PtRuRhPdIr HEAAs provide abundant unsaturated sites for HOR, and the synergistic effect of multiple-active sites balances the adsorption of H* and *OH, boosting the HOR performance.

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用于高效氢氧化反应的高畸变高熵合金气凝胶

开发高效的碱性氢氧化反应电催化剂对阴离子交换膜燃料电池和提高氢经济性具有重要意义。在此，我们证明了具有高度扭曲结构的PtRuRhPdIr高熵合金气凝胶（HEAAs）作为高效的HOR电催化剂，并实现了元素组分范围为2 - 7的ptruu基金属气凝胶（MAs）的有效控制。特别是，碳上的PtRuRhPdIr HEAAs （PtRuRhPdIr HEAAs/C）表现出优异的HOR活性，在50 mV下Pt族金属（PGM）归一化质量活性（5.75 A mgPGM-1）和电化学表面积归一化的交换电流密度（0.69 mA cm-2）分别是商用Pt/C （0.34 A mgPGM-1, 0.17 mA cm-2）的16.9和4.1倍。机理研究表明，高度扭曲的PtRuRhPdIr HEAAs为HOR提供了丰富的不饱和位点，多个活性位点的协同作用平衡了H*和*OH的吸附，提高了HOR的性能。

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来源期刊

ACS Nano 工程技术-材料科学：综合

CiteScore

26.00

自引率

4.10%

发文量

1627

审稿时长

1.7 months

期刊介绍： ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.