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• 作者：Haiqing Zhou ; Fang Yu ; Jingying Sun ; Hangtian Zhu ; Ishwar Kumar Mishra ; Shuo Chen ; Zhifeng Ren
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：December 14, 2016
• 年：2016
• 卷：16
• 期：12
• 页码：7604-7609
• 全文大小：480K
• ISSN：1530-6992

文摘

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 (WS₂, WSe₂, 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 WS_2(1–x)Se_2x particles with a 3D porous metallic NiSe₂ 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/cm² at −88 mV), low Tafel slope (46.7 mV/dec), large exchange current density (214.7 μA/cm²), and good stability, which is better than most reports on WS₂ and NiSe₂ catalysts. This work paves an interesting route for boosting HER efficiency of transition metal dichalcogenide catalysts.