Nanostructured MoSe and its composites with graphite nanoparticles were prepared by a simple, inexpensive, and productive ball-milling method, demonstrating their superior effectiveness as electrocatalysts for the hydrogen evolution reaction (HER). The study revealed that the ball-milling duration significantly influences the prepared nanomaterials' morphology and electrocatalytic properties. The materials prepared in this way are characterized by significant delamination of both components and high defectiveness of molybdenum diselenide. The introduction of graphite nanoparticles into the molybdenum diselenide composition significantly enhances the material's electrocatalytic properties. It has been established that the electrocatalyst based on gMoSe/Gr(2h) is characterized by a Tafel slope of 40 mV/dec and a potential of −75 mV at a current density of 10 mA/cm. The electrode modified with gMoSe/Gr(2h) demonstrates exceptional stability for over 20 hours while maintaining a high current density of approximately 450 mA/cm at −300 mV. The study establishes that the high electrocatalytic activity of materials obtained in this manner is directly related to the presence of a high concentration of selenium vacancies in their structure, which can act as catalytically active centers in HER.

中文翻译：

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球磨设计的纳米结构 MoSe2/石墨电催化剂：通过高密度的活性位点实现优异的析氢性能

通过简单、廉价且高效的球磨方法制备了纳米结构 MoSe 及其与石墨纳米颗粒的复合材料，证明了它们作为析氢反应 (HER) 电催化剂的卓越有效性。研究表明，球磨时间显着影响所制备的纳米材料的形貌和电催化性能。以这种方式制备的材料的特点是两种组分的分层明显并且二硒化钼的缺陷率高。将石墨纳米颗粒引入二硒化钼组合物中显着增强了材料的电催化性能。已确定基于gMoSe/Gr(2h)的电催化剂的塔菲尔斜率为40 mV/dec，电流密度为10 mA/cm时电势为-75 mV。用 gMoSe/Gr(2h) 修饰的电极在 20 小时内表现出卓越的稳定性，同时在 -300 mV 下保持约 450 mA/cm 的高电流密度。研究表明，以这种方式获得的材料的高电催化活性与其结构中存在高浓度的硒空位直接相关，这些空位可以作为 HER 的催化活性中心。