Synergistic WO3·2H2O Nanoplates/WS2 Hybrid Catalysts for High-Efficiency Hydrogen Evolution

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• 作者：Lun Yang ; Xiaobin Zhu ; Shijie Xiong ; Xinglong Wu ; Yun Shan ; Paul K. Chu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：June 8, 2016
• 年：2016
• 卷：8
• 期：22
• 页码：13966-13972
• 全文大小：511K
• 年卷期：0
• ISSN：1944-8252

文摘

Tungsten trioxide dihydrate (WO₃·2H₂O) nanoplates are prepared by in situ anodic oxidation of tungsten disulfide (WS₂) film on carbon fiber paper (CFP). The WO₃·2H₂O/WS₂ hybrid catalyst exhibits excellent synergistic effects which facilitate the kinetics of the hydrogen evolution reaction (HER). The electrochromatic effect takes place via hydrogen intercalation into WO₃·2H₂O. This process is accelerated by the desirable proton diffusion coefficient in the layered WO₃·2H₂O. Hydrogen spillover from WO₃·2H₂O to WS₂ occurs via atomic polarization caused by the electric field of the charges on the planar defect or edge active sites of WS₂. The optimized hybrid catalyst presents a geometrical current density of 100 mA cm^–2 at 152 mV overpotential with a Tafel slope of ∼54 mV per decade, making the materials one of the most active nonprecious metal HER catalysts.