A Hypothesis on the Function of High‐Valent Fe in NiFe (Hydr)oxide in the Oxygen‐Evolution Reaction
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 Ni 2+ hydroxide treated with 57 Fe ions, where Fe sites are introduced onto the surface of Ni 2+ hydroxide, no Fe 4+ 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.
Authors
- Taifeng Liu (ORCID: https://orcid.org/0000-0002-6869-7022)
- Rile Ge
- Cejun Hu (ORCID: https://orcid.org/0009-0004-6961-7196)
- Nader Akbari
- Subhajit Nandy (ORCID: https://orcid.org/0000-0003-1053-5415)
- Mohammad Mahdi Najafpour (ORCID: https://orcid.org/0000-0001-9732-0016)
- Jafar Hussain Shah (ORCID: https://orcid.org/0000-0001-9865-1116)
- Keun Hwa Chae (ORCID: https://orcid.org/0000-0003-3894-670X)
- P. Aleshkevych (ORCID: https://orcid.org/0000-0002-2966-130X)
- Sumbal Farid
- Wei Xie (ORCID: https://orcid.org/0000-0002-8290-514X)
- Junhu Wang (ORCID: https://orcid.org/0000-0003-1987-2522)
- Changchang Dong
- Liang Zhang (ORCID: https://orcid.org/0000-0002-5220-4748)
Institutions
- Sharif University of Technology (IR)
- Korea Advanced Institute of Science and Technology (KR)
- Institute for Advanced Studies in Basic Sciences (IR)
- Henan University (CN)
- Dalian Institute of Chemical Physics (CN)
- Chinese Academy of Sciences (CN)
- Nankai University (CN)
- Institute of Physics (PL)
- Jiangsu University of Science and Technology (CN)
- Nanomaterials Research (United States) (US)
- Institute of Psychology (PL)
- Advanced Analysis Center (JP)
- Korea Institute of Science and Technology (KR)
- Polish Academy of Sciences (PL)
Publication Details
- Journal
- Angewandte Chemie
- Published
- 2024-11-04
- DOI
- https://doi.org/10.1002/ange.202418798
- Citations
- 7
- Primary Topic
- Catalytic Processes in Materials Science
- Type
- article
- Field-Weighted Citation Impact
- 0.82
Funders
- Institute for Advanced Studies in Basic Sciences