| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Preparation and Hydrogen Evolution Performance of Ni(SxSe1-x)2 Array Catalytic Electrode |
| GUO Yajie, LI Fan, GUO Dong, ZHANG Chunrui, LU Shangzhi
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| Engineering Research Center of Transportation Materials of Ministry of Education, School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China |
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Abstract Pyrite transition metal sulfur compounds (MX2, typical M=Fe, Co or Ni, X=S or Se) have broad development prospects in the field of electrocatalysts due to their unique electronic structure, low price, high catalytic activity and good stability. However, there is still a gap between its electrocatalytic performance and that of traditional Pt noble metal catalysts. Therefore, this paper attempts to further improve its catalytic performance by doping and regulating the composition of the catalyst. The precursors Ni2(CO3)(OH)2 nanowire arrays were synthesized on carbon fiber surface by hydrothermal method. The self-supporting integrated catalytic electrode with anion co-doped Ni(SxSe1-x)2 nanowire arrays on carbon fiber paper were synthesized by chemical vapor deposition using S/Se mixed powders as reaction source, where the composition of the catalyst was controllable. The electrocatalytic performance test showed that Ni(S0.81Se0.19)2 nanowire exhibited the best catalytic performance among the Ni(SxSe1-x)2 catalysts with different components. The current densities of 10 mA·cm-2 and 100 mA·cm-2 could be achieved by only 93 mV and 135 mV overpotential, respectively, and the Tafel slope was as low as 42.07 mV·dec-1. These results show that anion doping can further improve the catalytic activity of these catalysts, and provide ideas for the design and preparation of alkali metal compound electrocatalysts with high efficiency and low cost.
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Published: 24 July 2020
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| Fund:This work was financially supported by the Key Research and Development Plan in Shaanxi Province of China (2017GY-033), Shaanxi Postdoctoral Science Foundation (2017BSHTDZZ01). |
| About author:: Yajie Guo, professor of Chang’an University, master tutor, graduated from Xi’an Jiaotong University (Ph.D. in engineering) in 2011, then joined the Department of Material Forming and Control Engineering, School of Materials Science and Engineering, Chang’an University. In 2017, he was fully funded by CSC to visit the University of New South Wales (UNSW) in Australia. He has long been engaged in research work on connection technologies and interfaces of heteroge-neous materials, metal matrix composite materials and functional metal mate-rials. In the past 5 years, he has presided over topics including the National Natural Science Foundation of China, China Postdoctoral Fund, Shaanxi Key R & D Program, Shaanxi Postdoctoral Fund, Shaanxi Provincial Natural Science Foundation and more than 10 topics. The first author of influential journals at home and abroad published more than 10 SCI papers and autho-rized 4 national invention patents. |
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2020, Vol. 34 
