Synergistic WO3 center dot 2H(2)O Nanoplates/WS2 Hybrid Catalysts for High-Efficiency Hydrogen Evolution
Synergistic WO3 center dot 2H(2)O Nanoplates/WS2 Hybrid Catalysts for High-Efficiency Hydrogen Evolution
复制标题
用于高效析氢的协同 WO3 中心点 2H(2)O 纳米板/WS2 混合催化剂
DOI：
10.1021/acsami.6b04045
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发表时间：
2016
影响因子：
9.5
通讯作者：
Chu Paul K.
中科院分区：
文献类型：
--
作者：
Yang Lun;Zhu Xiaobin;Xiong Shijie;Wu Xinglong;Shan Yun;Chu Paul K.
采用阳极氧化法在碳纤维纸(CFP)上制备了WO_3·2H_2O(WO_3·2H_2O)纳米片。WO_3·2H_2O/WS_2杂化催化剂表现出良好的协同效应，促进了析氢反应的动力学。电致变色效应是通过氢嵌入到WO_3·2H_2O中发生的。层状WO_3·2H_2O中理想的质子扩散系数加速了这一过程。从WO_3·2H_2O到WS_2的氢溢出是通过WS_2平面缺陷或边缘活性中心上电荷的电场引起的原子极化而发生的。优化后的复合催化剂在152 mV过电位下的几何电流密度为100 mA cm-2，塔菲尔斜率为∼54 mV/十年，使其成为最具活性的非贵金属HER催化剂之一。
Tungsten trioxide dihydrate (WO3·2H2O) nanoplates are prepared byin situanodic oxidation of tungsten disulfide (WS2) film on carbon fiber paper (CFP). The WO3·2H2O/WS2hybrid 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 WS2occurs 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–2at 152 mV overpotential with a Tafel slope of ∼54 mV per decade, making the materials one of the most active nonprecious metal HER catalysts.