Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution

Yunxing Zhao, Michael T. Tang, Sudong Wu, Jing Geng, Zhaojun Han, Karen Chan*, Pingqi Gao*, Hong Li*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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. 
Original languageEnglish
JournalJournal of Catalysis
Volume382
Pages (from-to)320-328
ISSN0021-9517
DOIs
Publication statusPublished - 2020

Keywords

  • 2D heterostructure
  • Hydrogen evolution
  • Stabilization function
  • Vacancies
  • Long-term stability

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