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Chemically activating MoS2 via spontaneous atomic palladium interfacial doping towards efficient hydrogen evolution.

Zhaoyan Luo1,2, Yixin Ouyang3, Hao Zhang4

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This study introduces a new method to enhance molybdenum disulfide (MoS2) for catalytic hydrogen production. Doping with palladium significantly improves MoS2

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Chalcogels face limitations in catalytic hydrogen production due to issues with intrinsic activity, site density, electrical transport, and stability.
  • Developing effective strategies to overcome these challenges is crucial for advancing hydrogen production technologies.

Purpose of the Study:

  • To concurrently address the intrinsic activity, site density, electrical transport, and stability limitations of molybdenum disulfide (MoS2) for catalytic hydrogen production.
  • To develop a novel surface activation technique for MoS2 using palladium doping.

Main Methods:

  • Chemically activating the MoS2 surface basal plane by doping with a low content of atomic palladium via a spontaneous interfacial redox technique.
  • Investigating palladium substitution at the molybdenum site, inducing sulfur vacancy and converting the 2H to the 1T structure.
  • Utilizing theoretical calculations to determine hydrogen adsorption energy on sulfur atoms adjacent to palladium sites.

Main Results:

  • Palladium doping at molybdenum sites introduced sulfur vacancies and stabilized the 1T phase of MoS2.
  • Theoretical calculations showed a low hydrogen adsorption energy of -0.02 eV at palladium-adjacent sulfur sites.
  • MoS2 doped with 1wt% palladium exhibited an exchange current density of 805 μA cm⁻² and an overpotential of 78 mV at 10 mA cm⁻², with good stability.

Conclusions:

  • The developed surface activating technique effectively addresses multiple challenges in MoS2 for catalytic hydrogen production.
  • Palladium-doped MoS2 demonstrates catalytic performance comparable to platinum, opening new avenues for efficient hydrogen generation.
  • This approach offers a pathway to manipulate MoS2 catalytic performance for advanced energy applications.