A Hypothesis on the Function of High‐Valent Fe in NiFe (Hydr)oxide in the Oxygen‐Evolution Reaction
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<sup>2+</sup> hydroxide treated with <sup>57</sup>Fe ions, where Fe sites are introduced onto the surface of Ni<sup>2+</sup> hydroxide, no Fe<sup>4+</sup> 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 International Edition
- Published
- 2024-11-04
- DOI
- https://doi.org/10.1002/anie.202418798
- Citations
- 19
- Primary Topic
- Electrocatalysts for Energy Conversion
- Type
- article
- Field-Weighted Citation Impact
- 1.95
Funders
- Institute for Advanced Studies in Basic Sciences