期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 298, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120557
关键词
Hydrogen evolution reaction; Ru; Dual single-atom catalyst; MoS2
资金
- National Natural Science Foundation of China [2177060378, 21978023, 21627813, 21521005]
- Program for Changjiang Scholars, Innovative Research Teams in Universities [IRT1205]
- Fundamental Research Funds for the Central Universities [12060093063, XK1803-05]
A dimetallic single-atom catalyst Ru/Ni-MoS2 was fabricated, showing a super-low overpotential and excellent stability in the HER field, providing a new idea for the design of high-efficiency catalysts based on electronegativity difference and bimetallic single-atom regulation.
The limitation of single-atom catalysts hinders its promotion and application in the HER field. Herein, we fabricated a dimetallic single-atom catalyst where monoatomic Ru and Ni co-modify MoS2 using a mild method (Ru/Ni-MoS2). Experiments combined with theoretical calculations indicated that the single Ru atoms were anchored through single Ni atoms with strong electronegativity, and most of the Ru atoms coordinated with the S were distributed on the Ni atop sites. And the synergistic effect of the Ru/Ni-MoS2 with S atoms bonded with Ni as hydrogen acceptor and single-atoms Ru as hydroxyl acceptor, effectively reduced the intermediate energy barrier of the water dissociation step. The as-fabricated Ru/Ni-MoS2 exhibited a super-low overpotential of 32 mV at 10 mA cm(-2) with the corresponding Tafel slope of 41 mV.dec(-1) as well as negligible current attenuation over 20 h, far surpassing that of Ru-MoS2 and Ni-MoS2. This work not only provides a high-efficiency HER catalysts, but also a new idea based on electronegativity difference and bimetallic single-atom regulation to design catalyst.
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