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Preparation of Cu(OH)2/Cu2S arrays for enhanced hydrogen evolution reaction
Xiangchao Xu, Fen Qiao, Yanzhen Liu, Wenjie Liu
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Preparation of Cu(OH)2/Cu2S arrays for enhanced hydrogen evolution reaction
Cu(OH)2 has the advantages of ease of structural regulation, good conductivity, and relatively low cost, making it a suitable candidate material for use as an electrocatalyst. However, its catalytic efficiency and stability still need to be improved further. Therefore, Cu(OH)2/Cu2S was successfully prepared on copper foam (CF) using the in situ growth and hydrothermal method. The structural characterization showed that sulfidation treatment induced transformation of Cu(OH)2/CF from smooth nanorods into a corallike structure, which exposed more active sites of Cu(OH)2/Cu2S and enhanced the performance of electrocatalytic hydrogen evolution reaction (HER). Compared with Cu(OH)2, Cu(OH)2/Cu2S showed better alkaline HER performance, especially when the vulcanization concentration was 0.1 M, the overpotential of Cu(OH)2/Cu2S was 174 mV, and the reaction kinetics was 64 mv dec−1 at a current density of 10mA cm−2. In this work, the morphology and electronic structure of copper-based metal sulfide electrocatalysts were adjusted by sulfide treatment, which provided a new reference for improving HER performance.
hydrogen evolution reaction / hydrothermal synthesis / sulfidation treatment
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