电催化剂
材料科学
催化作用
氧化物
离解(化学)
异质结
电子转移
金属
过渡金属
过电位
化学工程
无机化学
化学
物理化学
电极
电化学
光电子学
冶金
生物化学
工程类
作者
Jue Hu,Chengxu Zhang,Yizhen Zhang,Bin Yang,Qianglong Qi,Mingzi Sun,Futing Zi,Michael K.H. Leung,Bolong Huang
出处
期刊:Small
[Wiley]
日期:2020-06-08
卷期号:16 (28)
被引量:69
标识
DOI:10.1002/smll.202002212
摘要
Developing efficient earth-abundant MoS2 based hydrogen evolution reaction (HER) electrocatalysts is important but challenging due to the sluggish kinetics in alkaline media. Herein, a strategy to fabricate a high-performance MoS2 based HER electrocatalyst by modulating interface electronic structure via metal oxides is developed. All the heterostructure catalysts present significant improvement of HER electrocatalytic activities, demonstrating a positive role of metal oxides decoration in promoting the rate-limited water dissociation step for the HER mechanism in alkaline media. The as-obtained MoS2 /Ni2 O3 H catalyst exhibits a low overpotential of 84 mV at 10 mA cm-2 and small charge-transfer resistance of 1.5 Ω in 1 m KOH solution. The current density (217 mA cm-2 ) at the overpotential of 200 mV is about 2 and 24 times higher than that of commercial Pt/C and bare MoS2 , respectively. Additionally, these MoS2 /metal oxides heterostructure catalysts show outstanding long-term stability under a harsh chronopotentiometry test. Theoretical calculations reveal the varied sensitivity of 3d-band in different transition oxides, in which Ni-3d of Ni2 O3 H is evidently activated to achieve fast electron transfer for HER as the electron-depletion center. Both electronic properties and energetic reaction trends confirm the high electroactivity of MoS2 /Ni2 O3 H in the adsorption and dissociation of H2 O for highly efficient HER in alkaline media.
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