am6b04045_si_001.pdf (5.71 MB)
Synergistic WO3·2H2O Nanoplates/WS2 Hybrid Catalysts for High-Efficiency Hydrogen Evolution
journal contribution
posted on 2016-05-23, 00:00 authored by Lun Yang, Xiaobin Zhu, Shijie Xiong, Xinglong Wu, Yun Shan, Paul K. ChuTungsten
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.