Journal article
Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution
Nanyang Technological University1
Stanford University2
Chinese Academy of Sciences3
University of New South Wales4
VISION – Center for Visualizing Catalytic Processes, Centers, Technical University of Denmark5
Catalysis Theory Center, Department of Physics, Technical University of Denmark6
Department of Physics, Technical University of Denmark7
Sun Yat-Sen University8
Sulfur (S) vacancies in MoS2 have been found to act as a new active center, which shows an unprecedented intrinsic HER activity under elastic strain. However, such S-vacancies are unstable and the activities are very sensitive to the vacancy concentration. A strategy to stabilize these abundant active sites is thus highly desirable.
Herein, we rationally design a catalyst system to stabilize S-vacancies in the basal plane of 2H-MoS2 supported on defective vertical graphene network (VGN). The energetically favorable line-shaped S-vacancies in MoS2 show a consistently high HER activity that is insensitive to S-vacancy concentration.
Moreover, the defective graphene support effectively stabilizes these S-vacancies. The optimized catalyst exhibits a superior HER activity with overpotential of 128 mV at 10 mA cm-2 and Tafel slope of 50 mV dec-1. Most importantly, the catalyst shows greatly increased stability over 500 h; benchmarking the most stable nonprecious HER catalyst in acidic media to date.
Language: | English |
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Year: | 2020 |
Pages: | 320-328 |
ISSN: | 10902694 and 00219517 |
Types: | Journal article |
DOI: | 10.1016/j.jcat.2019.12.028 |
ORCIDs: | 0000-0002-2437-319X , 0000-0002-6975-7787 and Chan, Karen |