Electrocatalytic splitting of water is the most convincing and straight forward path to extract hydrogen, but the efficiency of this process relies heavily on the catalyst employed. Here, molybdenum sulphoselenophosphide (MoS_45.1Se_11.7P_6.1) spheroids are reported as an active catalyst for the hydrogen evolution reaction (HER) and this is the first attempt to study on ternary anion based molybdenum chalcogenides. As‐prepared MoS_xSe_yP_z catalyst reveals a unique morphology of microspheroids capped by stretched‐out nanoflakes that exhibits excellent electrocatalytic activity ( j—10 mA cm⁻² @ 93 mV, Tafel slope of 50.1 mV dec⁻¹, TOF—0.40 s⁻¹) fairly closer to the performance of platinum (Pt) and predominant to those of the pre‐existing Mo‐chalcogenides and phosphides. Such an increase in performance stems from the copious amount of active edge sites, the presence of nanoflakes, and high circumferential area exposed by the spheroids. Besides, the electrode with MoS_45.1Se_11.7P_6.1 displays excellent stability in acidic medium over 10 h of continuous operation. This work paves way for improving the catalytic activity of existing Mo‐chalcogenide compounds by doping suitable mixed anions and also reveals the integral role of anions as well as their synergetic effects on the surface physiochemical properties and the HER catalysis.

中文翻译：

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硫代硒化钼钼球体是有效的制氢反应催化剂

水的电催化裂解是提取氢的最有说服力且最直接的途径，但此过程的效率在很大程度上取决于所用的催化剂。在此，据报道，硫磺硒化钼（MoS _45.1 Se _11.7 P _6.1）球体是析氢反应（HER）的活性催化剂，这是研究基于三价阴离子的钼硫属元素化物的首次尝试。制备的MoS _x Se _y P _z催化剂显示出被伸展的纳米薄片覆盖的微球体的独特形态，具有优异的电催化活性（j —10 mA cm ^-2 @ 93 mV，Tafel斜率为50.1 mV dec^-1，TOF-0.40 s ^-1）相当接近铂（Pt）的性能，并且主要存在于已存在的硫族硫属元素化物和磷化物中。这种性能的提高源于大量的活动边缘位置，纳米薄片的存在以及球状体暴露的高周向面积。此外，具有MoS _45.1 Se _11.7 P _6.1的电极在酸性介质中连续运行10小时后表现出出色的稳定性。这项工作为通过掺杂合适的混合阴离子改善现有的硫族硫属元素化合物的催化活性铺平了道路，还揭示了阴离子的整体作用以及它们对表面理化性质和HER催化的协同作用。