MoS₂ has been considered as a potential replacement for Pt-based catalysts in hydrogen evolution reaction. But the lack of sufficient active sites limits the intrinsic activity of MoS₂-based catalysts. Here, we propose a general strategy to synthesize ultra-small MoS₂ nanosheets grown evenly on carbon substrates to maximize the active sites by exposing more edge positions and inducing MoS₂ phase transition. It is found that Ru can assist MoS₂ to grow vertically and uniformly on the surface of carbon substrates by in situ derivatization to improve the catalytic activity effectively. MoS₂ nanosheets on the substrates are much smaller and denser than those prepared without Ru or with other metal elements. Electrocatalysis results revealed that the number of active sites and conductivity of the optimized Ru-MoS₂@CSs increase obviously, and the overpotential at 10 mA cm⁻² is much lower than that of MoS₂@CSs and metal (Co, Ni)-MoS₂@CSs, respectively, at 1.0 M KOH.

中文翻译：

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在碳载体上均匀生长超小 MoS2 纳米片以提高析氢活性的总体策略


MoS ₂被认为是析氢反应中Pt基催化剂的潜在替代品。但缺乏足够的活性位点限制了MoS ₂基催化剂的固有活性。在这里，我们提出了合成在碳基底上均匀生长的超小MoS ₂纳米片的总体策略，通过暴露更多边缘位置并诱导MoS ₂相变来最大化活性位点。研究发现Ru可以通过原位衍生化的方式辅助MoS ₂在碳基底表面垂直均匀生长，有效提高催化活性。基底上的MoS ₂纳米片比不含Ru或其他金属元素制备的MoS 2 纳米片更小且更致密。电催化结果表明，优化后的Ru-MoS ₂ @CSs的活性位点数量和电导率明显增加，10 mA cm ^-2下的过电势远低于MoS ₂ @CSs和金属(Co, Ni)- MoS ₂ @CSs，分别为 1.0 M KOH。