As a typical transition-metal dichalcogenides, MoS₂ has been a hotspot of research in many fields. In this work, the MoS₂ nanosheets were compounded on 1T-VS₂ nanoflowers (VS₂@MoS₂) successfully by a two-step hydrothermal method for the first time, and their hydrogen evolution properties were studied mainly. The higher charge-transfer efficiency benefiting from the metallicity of VS₂ and the greater activity due to more exposed active edge sites of MoS₂ improve the hydrogen evolution reaction performance of the nanocomposite electrocatalyst. Adsorption and transport of an intermediate hydrogen atom by VS₂ also enhances the hydrogen evolution efficiency. The catalyst shows a low onset potential of 97 mV, a Tafel slope as low as 54.9 mV dec^–1, and good stability. Combining the electric conductivity of VS₂ with the physicochemical stability of MoS₂, VS₂@MoS₂ also exhibits excellent humidity properties.

中文翻译：

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MoS ₂纳米片和VS ₂对增湿反应的析氢反应的协同作用

作为典型的过渡金属二卤化物，MoS ₂一直是许多领域研究的热点。在这项工作中，MoS ₂纳米片首次通过两步水热法成功地复合在1T-VS ₂纳米花（VS ₂ @MoS ₂）上，并且主要研究了它们的析氢性能。受益于VS ₂的金属性的较高的电荷转移效率和由于MoS _2的更多暴露的活性边缘位点而导致的更大的活性改善了纳米复合电催化剂的氢析出反应性能。VS ₂对中间氢原子的吸附和迁移还提高了氢气的释放效率。该催化剂显示出97 mV的低起始电势，Tafel斜率低至54.9 mV dec ^–1和良好的稳定性。VS ₂的电导率与MoS ₂的理化稳定性相结合，VS ₂ @MoS ₂也显示出优异的湿度性能。