Surface Sulfur Vacancy Engineering of Metal Sulfides Promoted Desorption of Hydrogen Atoms for Enhanced Electrocatalytic Hydrogen Evolution

Sulfur vacancy (SV) engineering is an evolving approach to improve the performance of metal sulfides for hydrogen evolution reactions (HER); however, a simple and universal method for creating SV is still missing; thus, the catalytic role of SV in elemental steps of HER remains unclear. Here, we dev...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2021-06, Vol.125 (23), p.12707-12712
Main Authors: Ali, Tariq, Qiao, Wei, Zhang, Dongsheng, Liu, Weifeng, Sajjad, Saman, Yan, Chenglin, Su, Ren
Format: Article
Language:English
Subjects:
C: Chemical and Catalytic Reactivity at Interfaces
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Summary:Sulfur vacancy (SV) engineering is an evolving approach to improve the performance of metal sulfides for hydrogen evolution reactions (HER); however, a simple and universal method for creating SV is still missing; thus, the catalytic role of SV in elemental steps of HER remains unclear. Here, we develop a facial hydrothermal process employing hydrochloride acid as the sulfur etching agent to synthesize high-performance MoS2-based electrocatalysts. Surface vacancy-engineered MoS2 shows a 32-fold enhancement in HER compared to pristine MoS2, owing to the promoted desorption of hydrogen atoms. This strategy is also applicable for the development of other metal sulfides. Vacancy-engineered CoMoS2 displays a η10mA of −0.23 V vs the reversible hydrogen electrode (RHE) and outperforms the Pt electrode at high current density owing to the optimized desorption of hydrogen.
ISSN:1932-7447
1932-7455
DOI:10.1021/acs.jpcc.1c04134