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Defect-interface coupling for stable lattice-oxygen-driven oxygen evolution at industrial current densities.

Shujie Liu1, Mao Sun2, Letian Dai1

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Summary
This summary is machine-generated.

Developing advanced catalysts for efficient water electrolysis is crucial for clean hydrogen production. This study introduces a novel NiFe LDH/FeMoO heterostructure catalyst that activates lattice oxygen, demonstrating high activity and stability for the oxygen evolution reaction.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Industrial water electrolysis requires active and stable catalysts for the oxygen evolution reaction (OER).
  • Developing efficient catalysts for large-scale clean hydrogen production remains a significant challenge.

Purpose of the Study:

  • To design and investigate a novel heterostructure catalyst for efficient and durable oxygen evolution.
  • To explore the mechanism of lattice oxygen activation in the heterostructure catalyst.

Main Methods:

  • Synthesis of NiFe layered double hydroxide (LDH) nanosheets anchored on Fe2(MoO4)3.
  • Electrochemical characterization of the NiFe LDH/FeMoO catalyst for OER in 1 M KOH.
  • Integration of the catalyst into a solar-powered electrolyzer to assess solar-to-hydrogen efficiency.

Main Results:

  • The NiFe LDH/FeMoO heterostructure catalyst exhibited high OER activity with a low overpotential of 316 mV at 2 A cm⁻².
  • The catalyst demonstrated excellent long-term stability, operating for over 3,000 hours.
  • A solar-to-hydrogen efficiency of 20.15% was achieved when the catalyst was used in a solar-powered electrolyzer.

Conclusions:

  • The heterostructure catalyst effectively activates lattice oxygen via oxygen vacancies and an internal electrical field, leading to enhanced OER performance.
  • This work presents a promising strategy for developing stable catalysts for water electrolysis.
  • The findings support the integration of renewable energy with water electrolysis for scalable clean hydrogen production.