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A Hypothesis on the Function of High-Valent Fe in NiFe (Hydr)oxide in the Oxygen-Evolution Reaction.

Author information

Affiliations

  • 1. IASBS: Institute for Advanced Studies in Basic Sciences, Chemistry, Department of Chemistry Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, IRAN, ISLAMIC REPUBLIC OF.
      Authors
    • Akbari N 1
    (1 author)
  • 2. Chinese Academy of Sciences Dalian Institute of Chemical Physics, Physics, CHINA.
      Authors
    • Shah JH 2
    • Ge R 2
    • Farid S 2
    • Dong C 2
    • Zhang L 2
    (5 authors)
  • 3. Nankai University, Chemistry, CHINA.
      Authors
    • Hu C 3
    (1 author)
  • 4. Korea Institute of Science and Technology Advanced Analysis Center, Chemistry, KOREA, REPUBLIC OF.
      Authors
    • Nandy S 4
    (1 author)
  • 5. Polish academy of science, Physics, POLAND.
      Authors
    • Aleshkevych P 5
    (1 author)
    • Show all (10)

Angewandte Chemie (International ed. in English), 04 Nov 2024, :e202418798
https://doi.org/10.1002/anie.202418798 PMID: 39494775 

Abstract 

This study investigated the dynamic changes in NiFe (hydr)oxide and identified the role of high-valent Fe in the oxygen-evolution reaction (OER) within alkaline media via in-situ techniques. Several high-valent Fe ions were found to remain considerably stable in the absence of potential in NiFe (hydr)oxide, even 96 hours after the OER. For Ni2+ hydroxide treated with 57Fe ions, where Fe sites are introduced onto the surface of Ni2+ hydroxide, no Fe4+ species were detected at the rate-determining step (RDS). The findings of this study suggested that the oxidation of bulk Fe ions, similar to Ni ions, to high valent forms, is charge accumulation without a direct role in OER; these results offered a novel perspective on manipulating Fe states to optimize OER efficacy. The prevailing hypothesis suggested that trace amounts of high-valent Fe ions, notably those on the surface, directly participate in OER.

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Read article at publisher's site: https://doi.org/10.1002/anie.202418798

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