Cu-MoS2/rGO hybrid material for enhanced hydrogen evolution reaction performance
Cu-MoS2/rGO hybrid material for enhanced hydrogen evolution reaction performance
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Cu-MoS2/rGO杂化材料可增强析氢反应性能
DOI：
10.1016/j.ijhydene.2020.02.011
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发表时间：
2020
影响因子：
7.2
通讯作者：
Yin Ping
中科院分区：
文献类型：
--
作者：
Wang Kunchan;Zhan Zhenxiang;Lei Ting;Yin Ping
采用一步溶剂热法制备了Cu掺杂的MoS 2（Cu-MoS 2）/还原氧化石墨烯（rGO）（Cu-MoS 2/rGO）杂化材料。X射线衍射（XRD）结果表明，Cu的掺杂不会改变MoS 2的晶体结构。X射线光电子能谱（XPS）分析表明，Cu原子的掺杂影响了MoS 2的电子结构，有利于增加边缘活性位。电化学阻抗谱（EIS）结果表明，与MoS 2/rGO杂化材料相比，Cu-MoS 2/rGO杂化材料具有更快的电荷转移。此外，所得Cu-MoS 2/rGO催化剂（Cu/Mo摩尔比为9%）在10 mA cm-2下表现出较低的过电位（199 mV），小的Tafel斜率（44 mV dec-1）和循环稳定性，表明对HER的电催化活性增强。导致MoS 2的电子结构改变和电荷重新分布。
Cu doped MoS2(Cu–MoS2)/reduced graphene oxide (rGO) (Cu–MoS2/rGO) hybrid material is fabricated by a facile one-step solvothermal method. The X-ray diffraction (XRD) results suggest that the doping of Cu does not alter the crystal structure of MoS2. X-ray photoelectron spectroscopy (XPS) analysis reveal that the doping of Cu atoms influences the electronic structure of MoS2, which is favorable to increase active sites of edges. Electrochemical impedance spectroscopy (EIS) results indicate that Cu–MoS2/rGO performed a faster charge-transfer in comparison to MoS2/rGO hybrid. In addition, the resultant Cu–MoS2/rGO catalyst with Cu/Mo mole ratio of 9% exhibits a lower overpotential of 199 mV at 10 mA cm−2, small Tafel slop of 44 mV dec−1and cycling stability, indicative of enhanced electrocatalytic activity towards HER. The improved performance is attributed to the increased active sites and a synergistic effect between copper and molybdenum, leading to electronic structure change and charge redistribution of MoS2.