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Single-Atom Vacancy Defect to Trigger High-Efficiency Hydrogen Evolution of MoS2.

Xin Wang1,2, Yuwei Zhang1,2, Haonan Si1,2

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Optimizing sulfur vacancies in molybdenum disulfide (MoS₂) enhances hydrogen evolution reaction (HER) catalysis. Single S-vacancies improve catalytic activity more than agglomerate ones, paving the way for advanced defect engineering.

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Defect engineering in transition metal dichalcogenides (TMDs) is crucial for tuning material properties.
  • Sulfur vacancies (S-vacancies) in MoS₂ are known to influence catalytic activity, but their optimal state remains unclear.

Purpose of the Study:

  • To determine the optimal concentration and distribution of S-vacancies in MoS₂ for enhanced hydrogen evolution reaction (HER) catalysis.
  • To develop a facile method for introducing controlled S-vacancies into MoS₂ nanosheets.

Main Methods:

  • High-throughput calculations were used to identify optimal S-vacancy configurations for HER.
  • A chemical etching strategy using H₂O₂ was employed to introduce homogeneous S-vacancies into MoS₂ nanosheets.
  • Systematic tuning of etching parameters (duration, temperature, concentration) modulated the S-vacancy state.

Main Results:

  • The study identified optimized S-vacancy states in MoS₂ for HER through theoretical calculations.
  • A facile H₂O₂ etching method successfully introduced homogeneously distributed single S-vacancies.
  • Optimal HER performance achieved a Tafel slope of 48 mV dec⁻¹ and an overpotential of 131 mV at 10 mA cm⁻², outperforming agglomerate vacancies.

Conclusions:

  • Single S-vacancies in MoS₂ offer superior HER performance compared to agglomerate vacancies due to enhanced electronic structure and electrical transport.
  • The developed strategy bridges theoretical design and experimental realization for sophisticated defect engineering in catalysis.
  • This work advances the potential of MoS₂-based catalysts for efficient hydrogen production.