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Heterostructure of Fe-Doped CoMoO/CoMoO as an Efficient Electrocatalyst for Oxygen Evolution Reaction.

Cu Dang Van1, Samiran Garain1, Joel W Ager2,3

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|February 15, 2024
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Summary

A novel Fe-doped CoMoO/CoMoO core-shell nanostructure (CMFO) demonstrates superior performance for the oxygen evolution reaction (OER). This efficient electrocatalyst offers enhanced activity and stability for water splitting and CO2 reduction applications.

Keywords:
core–shell structureelectrocatalystheterostructureoxygen evolution reactionoxygen vacancy

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The oxygen evolution reaction (OER) is critical for energy applications like water splitting and CO2 reduction.
  • Developing efficient, cost-effective electrocatalysts is essential to overcome OER's sluggish kinetics.
  • Transition-metal-based catalysts are promising candidates for OER applications.

Purpose of the Study:

  • To synthesize and characterize a novel core-shell nanostructure of Fe-doped CoMoO/CoMoO (CMFO) for enhanced OER performance.
  • To investigate the structure-activity relationship of the CMFO catalyst.
  • To evaluate the electrocatalytic activity and stability of CMFO for the OER.

Main Methods:

  • Synthesis of core-shell Fe-doped CoMoO/CoMoO (CMFO) nanostructures.
  • Characterization of the synthesized materials using various analytical techniques.
  • Electrochemical evaluation of CMFO and pristine CoMoO (CMO) catalysts for OER.

Main Results:

  • The synthesized CMFO exhibited excellent electrocatalytic properties for OER.
  • An amorphous layer of Fe-doped CoMoO with oxygen vacancies in CMFO enhanced catalytic activity.
  • The optimized CMFO-550 catalyst showed lower overpotential, Tafel slope, and remarkable long-term stability (>90 h) compared to CMO-550.

Conclusions:

  • Fe-doped CoMoO/CoMoO core-shell nanostructures are highly efficient electrocatalysts for the OER.
  • The unique nanostructure and presence of oxygen vacancies contribute to the enhanced catalytic performance.
  • CMFO-550 presents a cost-effective and stable alternative for OER applications in energy conversion and storage.