期刊
ADVANCED SCIENCE
卷 6, 期 10, 页码 -出版社
WILEY
DOI: 10.1002/advs.201900090
关键词
carbon nanotubes; core/shell structure; hydrogen evolution electrocatalysis; molybdenum sulfide; ruthenium doping
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
- Shenzhen fundamental research funding [JCYJ20160608140827794]
Promoting the intrinsic activity and accessibility of basal plane sites in 2D layered metal dichalcogenides is desirable to optimize their catalytic performance for energy conversion and storage. Herein, a core/shell structured hybrid catalyst, which features few-layered ruthenium (Ru)-doped molybdenum disulfide (MoS2) nanosheets closely sheathing around multiwalled carbon nanotube (CNT), for highly efficient hydrogen evolution reaction (HER) is reported. With 5 at% (atomic percent) Ru substituting for Mo in MoS2, Ru-MoS2/CNT achieves the optimum HER activity, which displays a small overpotential of 50 mV at -10 mA cm(-2) and a low Tafel slope of 62 mV dec(-1) in 1 M KOH. Theoretical simulations reveal that Ru substituting for Mo in coordination with six S atoms is thermodynamically stable, and the in-plane S atoms neighboring Ru dopants represent new active centers for facilitating water adsorption, dissociation, and hydrogen adsorption/desorption. This work provides a multiscale structural and electronic engineering strategy for synergistically enhancing the HER activity of transition metal dichalcogenides.
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