Department of Physics and TcSUH, University of Houston , Houston, Texas 77204, United States.
Nano Lett. 2016 Dec 14;16(12):7604-7609. doi: 10.1021/acs.nanolett.6b03467. Epub 2016 Nov 4.
The large consumption of natural fossil fuels and accompanying environmental problems are driving the exploration of cost-effective and robust catalysts for hydrogen evolution reaction (HER) in water splitting. Tungsten dichalcogenides (WS, WSe, etc.) are promising candidates for such purpose, but their HER performances are inherently limited by the sparse catalytic edge sites and poor electrical conductivity. Here we demonstrate a highly active and stable HER catalyst by integrating ternary tungsten sulfoselenide WSSe particles with a 3D porous metallic NiSe foam, in which good electrical conductivity, good contact, large surface area, and high-density active edge sites are simultaneously obtained, thus contributing to outstanding catalytic performance: large cathode current density (-10 mA/cm at -88 mV), low Tafel slope (46.7 mV/dec), large exchange current density (214.7 μA/cm), and good stability, which is better than most reports on WS and NiSe catalysts. This work paves an interesting route for boosting HER efficiency of transition metal dichalcogenide catalysts.
大量消耗天然化石燃料和随之而来的环境问题推动了人们对用于水分解析氢反应（HER）的高性价比和稳定催化剂的探索。二硒化钨（WS、WSe 等）是此类目的的有前途的候选材料，但它们的 HER 性能受到稀疏催化边缘位点和较差导电性的固有限制。在这里，我们通过将三元钨硫化硒（WSSe）颗粒与 3D 多孔金属 NiSe 泡沫集成，展示了一种高活性和稳定的 HER 催化剂，其中同时获得了良好的导电性、良好的接触、大的表面积和高密度的活性边缘位点，从而表现出出色的催化性能：大阴极电流密度（-10 mA/cm 在-88 mV）、小塔菲尔斜率（46.7 mV/dec）、大交换电流密度（214.7 μA/cm）和良好的稳定性，优于大多数关于 WS 和 NiSe 催化剂的报道。这项工作为提高过渡金属二硒化物催化剂的 HER 效率开辟了一条有趣的途径。
