Paired Ru‒O‒Mo ensemble for efficient and stable alkaline hydrogen evolution reaction

Huang Jing Wei Li, Kang Liu, Junwei Fu, Kejun Chen, Kexin Yang, Yiyang Lin, Baopeng Yang, Qiyou Wang, Hao Pan, Zhoujun Cai, Hongmei Li, Maoqi Cao, Junhua Hu, Ying Rui Lu, Ting Shan Chan, Emiliano Cortés, Andrea Fratalocchi, Min Liu

Research output: Contribution to journalArticlepeer-review

93 Scopus citations

Abstract

Electrocatalytic hydrogen evolution reaction (HER) in alkaline media is a promising electrochemical energy conversion strategy. Ruthenium (Ru) is an efficient catalyst with a desirable cost for HER, however, the sluggish H2O dissociation process, due to the low H2O adsorption on its surface, currently hampers the performances of this catalyst in alkaline HER. Herein, we demonstrate that the H2O adsorption improves significantly by the construction of Ru–O–Mo sites. We prepared Ru/MoO2 catalysts with Ru–O–Mo sites through a facile thermal treatment process and assessed the creation of Ru–O–Mo interfaces by transmission electron microscope (TEM) and extended X-ray absorption fine structure (EXAFS). By using Fourier-transform infrared spectroscopy (FTIR) and H2O adsorption tests, we proved Ru–O–Mo sites have tenfold stronger H2O adsorption ability than that of Ru catalyst. The catalysts with Ru–O–Mo sites exhibited a state-of-the-art overpotential of 16 mV at 10 mA cm–2 in 1 M KOH electrolyte, demonstrating a threefold reduction than the previous bests of Ru (59 mV) and commercial Pt (31 mV) catalysts. We proved the stability of these performances over 40 h without decline. These results could open a new path for designing efficient and stable catalysts.
Original languageEnglish (US)
Pages (from-to)105767
JournalNano Energy
Volume82
DOIs
StatePublished - Jan 18 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-01-28
Acknowledgements: We thank the Natural Science Foundation of China (Grant No. 21872174, 22002189, and U1932148), International Science and Technology Cooperation Program (Grant No. 2017YFE0127800 and 2018YFE0203402), Hunan Provincial Science and Technology Program (Grant No. 2017XK2026), Hunan Provincial Natural Science Foundation of China (Grant No. 2020JJ2041 and 2020JJ5691), Shenzhen Science and Technology Innovation Project (Grant No. JCYJ20180307151313532), The Hunan Provincial Science and Technology Plan Project (Grant No. 2017TP1001), The Fundamental Research Funds for the Central Universities of Central South University, and Ministry of Science and Technology, Taiwan (Grant No. MOST 109–2113-M-213–002).

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