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Related Experiment Video

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Salt-Induced High-Density Vacancy-Rich 2D MoS2 for Efficient Hydrogen Evolution.

Ping Man1,2,3, Shan Jiang4,5, Ka Ho Leung1,2,3

  • 1Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|July 28, 2023
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Summary

A new salt-assisted chemical vapor deposition (CVD) method synthesizes ultrahigh-density vacancy-rich molybdenum disulfide (MoS2) for enhanced hydrogen evolution reactions. This approach offers a controllable and nondestructive way to create sulfur vacancies, improving catalytic performance.

Keywords:
2D MoS2chemical vapor depositionhydrogen evolution reactionssalt‐assistedsulfur vacancies

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Molybdenum disulfide (MoS2) is a promising non-noble metal 2D catalyst for hydrogen evolution reactions.
  • Sulfur vacancies are crucial defects for activating MoS2's basal plane and enhancing catalytic activity.
  • Current methods for introducing sulfur vacancies are limited and involve costly post-treatment processes.

Purpose of the Study:

  • To develop a novel, cost-effective, and controllable method for synthesizing ultrahigh-density vacancy-rich 2H-MoS2.
  • To investigate the mechanism of sulfur vacancy generation using a salt-assisted CVD approach.
  • To evaluate the catalytic performance of the synthesized vacancy-rich MoS2 for hydrogen evolution reactions.

Main Methods:

  • A salt-assisted chemical vapor deposition (CVD) method was employed using a potassium chloride promoter.
  • Ultrahigh-density vacancy-rich 2H-MoS2 was synthesized with controllable sulfur vacancy densities up to 3.35 × 10^14 cm^-2.
  • The catalytic activity was measured using microcell measurements in a 0.5 M H2SO4 electrolyte.

Main Results:

  • The novel salt-assisted CVD method successfully synthesized MoS2 with ultrahigh-density sulfur vacancies.
  • The defect generation mechanism was linked to ion adsorption and the instability of MoS2-K-H2O during transfer.
  • The vacancy-rich MoS2 exhibited exceptional catalytic activity with an overpotential of ~158.8 mV and a Tafel slope of 54.3 mV dec^-1.

Conclusions:

  • Salt-assisted CVD is a promising and controllable method for defect engineering in 2D materials like MoS2.
  • This approach offers a significant advancement for enhancing the catalytic performance of MoS2 in hydrogen evolution reactions.
  • The study highlights the potential for non-noble metal 2D catalysts with tailored defects for electrochemical applications.