Transition metal dichalcogenides have shown promise as highly efficient hydrogen evolution reaction (HER) electrocatalysts. In this work, we demonstrate a one-pot hydrothermal synthesis of ternary 2H-MoS_2xSe_2(1−x) nanosheets for enhanced hydrogen production. Compared to pristine 2H-MoSe₂ and 2H-MoS₂, introduction of a third element not only expands the interlayer spacing, but also provides more active catalytic sites and lowers the charge transfer resistance. As a consequence, MoS_2xSe_2(1−x) exhibits a high electrocatalytic HER activity with a low overpotential of 188 mV vs. a RHE to achieve a geometric current density of −10 mA cm⁻² and a low Tafel slope of 43 mV dec⁻¹ in 0.5 M H₂SO₄. This study provides valuable insights that ternary structure formation can be effective for the preparation of high-performance HER electrocatalysts.

中文翻译：

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水热合成三元MoS _{2 x} Se _{2（1- x）}纳米片用于电催化制氢†

过渡金属二卤化物已显示出有望作为高效的析氢反应（HER）电催化剂。在这项工作中，我们演示了一锅法水热合成三元2H-MoS _{2 x} Se _{2（1- x）}纳米片以增强氢气的产生。与原始的2H-MoSe ₂和2H-MoS _2相比，引入第三种元素不仅扩大了层间间距，而且提供了更多的活性催化位并降低了电荷转移阻力。因此，的MoS _{2 X}硒_{2（1- X）}表现出与低超电势188 mV的较高的电HER活性与RHE在0.5 MH ₂ SO _4中达到-10 mA cm ^-2的几何电流密度和43 mV dec ^-1的低Tafel斜率。这项研究提供了有价值的见解，即三元结构的形成可以有效地制备高性能HER电催化剂。