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June 19, 2026Small

Quenching‐Induced Octahedral Fe Vacancies in CoFe Spinel Nanosheets for Boosted Oxygen Evolution

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Authors

ZLZheng LiMDMengting DongYZYue Zhu

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Overview

Randomized trial demonstrates improved OER performance in nanosheets, suggesting cation vacancy engineering is effective.

Key Points

  • The primary aim is to enhance oxygen evolution reaction (OER) activity in CoFe spinel nanosheets through the introduction of cation vacancies.
  • Introduced Fe vacancies into CoFe spinel nanosheets via a liquid-nitrogen quenching strategy.
  • Utilized X-ray absorption spectroscopy and pair distribution function analyses to study the structure.
  • Performed in situ Raman spectroscopy combined with density functional theory calculations to investigate the effects of vacated sites.
  • The optimized V Fe ‐CFO showed OER performance of 10 mA cm −2 at an overpotential of 244 mV.
  • Demonstrated durability over 330 hours under varying current densities of 10 to 400 mA cm −2.
  • Revealed that the CoFe oxyhydroxide layer formed during operation retains features associated with Fe vacancies, supporting reduced energy barriers.

Cite This Study

Li et al. (2026) studied this question.

synapsesocial.com/papers/6a34dde465a5b0777af2d746https://doi.org/10.1002/smll.74220
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