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Well-Defined Mo

Jin-Tao Ren1,2, Lei Chen1,2, Chen-Chen Weng1,2

  • 1National Institute for Advanced Materials, School of Materials Science and Engineering , Nankai University , Tianjin 300350 , China.

ACS Applied Materials & Interfaces
|September 12, 2018
PubMed
Summary
This summary is machine-generated.

This study developed efficient and affordable molybdenum carbide-carbon hybrid catalysts (MoC@NCS) for water splitting. These catalysts demonstrate excellent hydrogen evolution activity and durability in both acidic and alkaline conditions.

Keywords:
doped carbonshydrogen evolutionmolybdenum carbidesporous materialswater electrolysis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient and cost-effective electrocatalysts is crucial for water splitting technologies.
  • Molybdenum-based materials are promising alternatives to noble metals for hydrogen evolution reactions.

Purpose of the Study:

  • To design and fabricate novel molybdenum carbide-carbon hybrid catalysts (MoC@NCS) for efficient water reduction and oxygen evolution reactions.
  • To investigate the electrocatalytic performance and durability of MoC@NCS in both acidic and alkaline media.

Main Methods:

  • Fabrication of molybdenum carbide nanoparticles uniformly loaded in a porous N-doped carbon matrix using graphitic carbon nitride (g-C3N4) as a template.
  • Electrochemical characterization of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities.
  • Testing of a two-electrode alkaline electrolyzer for overall water splitting.

Main Results:

  • MoC@NCS exhibited excellent HER activity with low overpotentials (89 mV in alkaline, 81 mV in acidic) at 10 mA cm⁻², comparable to Pt/C.
  • The catalysts demonstrated robust long-term durability in both acidic and alkaline electrolytes.
  • The N-doped carbon matrix (NCS) showed high catalytic efficiency for OER.
  • An alkaline electrolyzer using MoC@NCS and NCS achieved 10 mA cm⁻² at 1.69 V with stable operation.

Conclusions:

  • The synergistic effect between the N-doped porous carbon matrix and uniformly distributed molybdenum carbide nanoparticles leads to outstanding electrocatalytic HER performance.
  • This work presents a cost-effective strategy for preparing size-controlled molybdenum-based electrocatalysts for hydrogen evolution.