Abstract Designing of catalysts with high activity and earth abundance which can further enhance the electrocatalytic hydrogen evolution performance so as to improve the hydrogen production efficiency. In this paper, we synthesized 1T-MoSe2-Se/MgAl-LDH composites by in-situ hydrothermal reduction method. The high proportion 1T phase (73.73%) of ultra-thin layer 1T-MoSe2-Se was obtained by acid dissolution operation, which can be ascribed to the limiting growth effect of MgAl-LDH. Compared to Pure MoSe2, it dramatically improved HER catalytic activity. the optimal 1T-MoSe2-Se (24 h) exhibits superior HER performance with a small overpotential (122 mV at the current density of 10 mA cm−2) and Tafel slope (54 mV dec−1) as well as excellent electrochemical stability. The introduction of Se can promote the conductivity of 1T-MoSe2-Se catalyst. Moreover, the best electrocatalytic hydrogen evolution performance can be exhibited synergistically only when the optimal match between MoSe2 and Se is achieved, which are confirmed by XPS analysis and HER test results.

中文翻译：

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提高 1T-MoSe2-Se 的析氢性能：通过层状双氢氧化物限制生长优化 MoSe2 的二维结构

摘要 设计具有高活性和地球丰度的催化剂，进一步提高电催化析氢性能，提高制氢效率。在本文中，我们通过原位水热还原法合成了 1T-MoSe2-Se/MgAl-LDH 复合材料。通过酸溶解操作获得了超薄层1T-MoSe2-Se的高比例1T相（73.73％），这可以归因于MgAl-LDH的限制生长效应。与 Pure MoSe2 相比，它显着提高了 HER 催化活性。最佳的 1T-MoSe2-Se（24 小时）表现出优异的 HER 性能，具有较小的过电位（在 10 mA cm-2 的电流密度下为 122 mV）和 Tafel 斜率（54 mV dec-1）以及优异的电化学稳定性。Se的引入可以提高1T-MoSe2-Se催化剂的导电性。而且，