智慧数据 | 高价值论文 | 桥氧复合非贵金属体系催化Tafel型碱性析氢 | 清洁能源 | 第132期【中国科讯】

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桥氧复合非贵金属体系催化Tafel型碱性析氢

Composite non-noble system with bridging oxygen for catalyzing Tafel-type alkaline hydrogen evolution

Sustainable

Zhigang Chen, Huimin Hu (College of Energy, Soochow University, Suzhou 215006, China), Lichang Yin (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China), Zhigang Zhao, Jin-Ho Choi, Gang Liu, and Fengxia Geng

PNAS | 2022-12-27| Vol 120, 1(2023)

Using hydrogen as a fuel is an effective way to combat energy crisis and at the same time reduce greenhouse gas emission. Alkaline hydrogen evolution reaction (HER) is one important way to obtain green hydrogen, which however is energy intensive and is difficult to obtain high efficiencies even when using state-of-the-art noble metal catalysts. Here, we report a three-component catalytic system using only non-noble elements, consisting of cobalt oxide clusters and single molybdenum atoms supported on oxyanion-terminated two-dimensional MXene, which enabled the unusual generation of hydrogen by a kinetically fast Volmer–Tafel process in an alkaline electrolyte. The key feature of this catalyst is that the three components are connected by bridging oxygen, which serves to immediately adsorb H* produced during water dissociation on cobalt oxide and relay it to the molybdenum single-atom catalyst. On the Mo atom, due to this unique coordination environment, the relayed H* intermediates directly combine and desorb, realizing H 2 generation through an unusual Tafel pathway. The presence of bridging oxygen increases the acidity of the catalyst as Brønsted acid with the reversible adsorption and donation of a proton, thus eliminating the need for acid addition and ensuring excellent and sustainable alkaline HER performance. The performance of our catalyst is comparable to that of the commercial noble metal catalyst PtRu/C. Our work makes a significant contribution to designing efficient non-noble catalysts for alkaline HER electrocatalysis.

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Cite： Chen, Z.; Hu, H.; Yin, L.; et al. Composite non-noble system with bridging oxygen for catalyzing Tafel-type alkaline hydrogen evolution. Proceedings of the National Academy of Sciences 2023, 120 (1), e2209760120.

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