Preparation and Hydrogen Evolution Performance of Ni(SxSe1-x)2 Array Catalytic Electrode
GUO Yajie, LI Fan, GUO Dong, ZHANG Chunrui, LU Shangzhi
Engineering Research Center of Transportation Materials of Ministry of Education, School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China
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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2020, Vol. 34 
