过电位
离解(化学)
材料科学
钼
异质结
密度泛函理论
分解水
吸附
催化作用
电化学
无机化学
电催化剂
量子点
氢
化学工程
纳米技术
冶金
电极
物理化学
化学
计算化学
光催化
光电子学
有机化学
工程类
生物化学
作者
Yaping Chen,Xingyong Wang,Mengmeng Lao,Kun Rui,Xiaobo Zheng,Haibo Yu,Jing Ma,Shi Xue Dou,Wenping Sun
出处
期刊:Nano Energy
[Elsevier]
日期:2019-07-17
卷期号:64: 103918-103918
被引量:72
标识
DOI:10.1016/j.nanoen.2019.103918
摘要
Molybdenum dichalcogenides, in particular, MoS2 and MoSe2, are very promising nonprecious metal-based electrocatalysts for hydrogen evolution reaction (HER) in acidic media. They exhibit inferior alkaline HER activity, however, due to the sluggish water dissociation process. Here, we design and synthesize new molybdenum dichalcogenide-based heterostructures with the basal planes decorated with SnS2 quantum dots towards enhanced alkaline HER activity. The electrochemical results reveal that the alkaline hydrogen evolution kinetics of molybdenum dichalcogenides is substantially accelerated after incorporation of SnS2 quantum dots. The optimal MoSe2/SnS2 heterostructure delivers a much lower overpotential of 285 mV than MoSe2 (367 mV) to reach a current density of 10 mA cm−2 in 1 M KOH. The improved catalytic activity is predominantly owing to the enhanced water dissociation kinetics of the heterostructures with well-defined interfaces. Density functional theory (DFT) calculations reveal that the presence of SnS2 significantly promotes the water adsorption capability of MoSe2 nanosheets, which consequently facilitates the subsequent water dissociation process. These results open up a new avenue for the rational design of well-defined heterostructures with enhanced water adsorption/dissociation capability for the development of high-performance alkaline HER electrocatalysts.
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