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Cation/anion-doping induced electronic structure modulation of CoMoO4 for enhanced hydrogen evolution.

Zhifeng Gao1, Tianjun Shen1, Zifeng Zeng1

  • 1School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 201418, PR China.

Journal of Colloid and Interface Science
|August 7, 2024
PubMed
Summary

Developing a novel electrocatalyst, Fe/B-CoMoO4, significantly enhances hydrogen evolution reaction (HER) performance. This durable and inexpensive catalyst offers a promising alternative to platinum for clean energy applications.

Keywords:
Cation/anion-dopingCoMoO(4)Electronic structure modulationHydrogen evolution

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient electrocatalysts for the hydrogen evolution reaction (HER) is crucial for addressing energy and environmental challenges.
  • Transition metal oxides offer potential but require structural and electronic optimization for high performance.

Purpose of the Study:

  • To investigate the effect of cation/anion co-doping on the HER activity of CoMoO4.
  • To design and fabricate a high-performance, inexpensive, and durable electrocatalyst for HER.

Main Methods:

  • Etching and reduction strategy to synthesize Fe and B co-doped CoMoO4 (Fe/B-CoMoO4).
  • Electrochemical characterization to evaluate HER performance, including current density, overpotential, and Tafel slope.
  • Durability testing for 100 hours.
  • Theoretical calculations to understand the synergistic effects of co-doping on electronic structure.

Main Results:

  • Fe/B-CoMoO4 achieved a current density of 10 mA cm⁻² at an overpotential of 38 mV with a Tafel slope of 51 mV dec⁻¹.
  • The catalyst demonstrated robust durability for 100 hours without performance decay.
  • Performance was comparable to commercial platinum on carbon (Pt/C) catalyst.

Conclusions:

  • Cation/anion co-doping of Fe and B in CoMoO4 significantly enhances its intrinsic HER activity.
  • Synergistic effects of Fe and B doping optimize the electronic structure, adsorption energy of H intermediates, and d-band center position.
  • This work provides guiding principles for designing efficient electrocatalysts for energy conversion devices.