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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient water electrolyzers require low-cost, earth-abundant hydrogen evolution reaction (HER) catalysts.
  • Existing catalysts often struggle with industrial conditions and facile preparation methods.

Purpose of the Study:

  • To develop a self-standing MoC-Mo2C catalytic electrode for efficient HER.
  • To utilize a one-step electro-carbiding process with CO2 as feedstock.

Main Methods:

  • One-step electro-carbiding of molybdenum using CO2.
  • Fabrication of a self-standing MoC-Mo2C electrode.
  • Electrochemical characterization in acidic and alkaline electrolytes.

Main Results:

  • Achieved low overpotentials for HER at 500 mA cm-2 (256 mV acidic, 292 mV alkaline).
  • Demonstrated long-term stability (>2400 h) and high-temperature performance (70 °C).
  • Identified key structural features: hydrophilic porous surface, heterojunctions, and favorable energetics for H* adsorption and water dissociation.

Conclusions:

  • The MoC-Mo2C electrode offers outstanding HER performance and stability.
  • The facile, scalable synthesis method using CO2 presents a promising pathway for industrial water electrolysis.
  • The unique heterojunction structure is crucial for the catalyst's enhanced activity.