磷化物
塔菲尔方程
二硫化钼
催化作用
材料科学
镍
钼
热液循环
化学工程
电解质
无机化学
化学
电化学
冶金
物理化学
有机化学
电极
工程类
作者
Fan Yang,Ning Kang,Jiayun Yan,Xiuli Wang,He Jun,Siyue Huo,Laizhou Song
出处
期刊:Metals
[MDPI AG]
日期:2018-05-16
卷期号:8 (5): 359-359
被引量:21
摘要
The hydrogen evolution reaction (HER) property of molybdenum disulfide (MoS 2 ) is undesirable because of the insufficient active edge sites and the poor conductivity.To enhance HER performance of MoS 2 , nickel phosphide (Ni 2 P) was combined with this catalyst and three MoS 2 /Ni 2 P hybrids (38 wt % Ni 2 P addition for MoS 2 /Ni 2 P-38, 50 wt % Ni 2 P addition for MoS 2 /Ni 2 P-50, and 58 wt % Ni 2 P addition for MoS 2 /Ni 2 P-58) were fabricated via a hydrothermal synthesis process.Morphologies, crystallinities, chemical components, specific surface areas, and HER properties of the fabricated MoS 2 /Ni 2 P samples in an alkaline electrolyte were characterized and tested.In addition, the insight into the HER properties of as-prepared catalysts were revealed by the density functional theory (DFT) calculation.Additionally, the stabilities of pure MoS 2 , Ni 2 P, and MoS 2 /Ni 2 P-50 samples were evaluated.The results show that the addition of Ni 2 P can enhance the HER property of the MoS 2 catalyst.Although HER properties of the above-mentioned three MoS 2 /Ni 2 P hybrids are inferior to that of pure Ni 2 P, they are much higher than that of MoS 2 .Among as-prepared three hybrids, MoS 2 /Ni 2 P-50 exhibits the best HER performance, which may be due to its uniform morphology, large specific surface area, and excellent stability.The MoS 2 /Ni 2 P-50 hybrid shows a high cathodic current density (70 mA/cm 2 at -0.48 V), small Tafel slope (~58 mV/decade), and a low charge transfer resistance (0.83 kΩ•cm 2 ).
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