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Fluorination-enabled Reconstruction of NiFe Electrocatalysts for Efficient Water Oxidation
- Source :
- Nano Letters; January 2021, Vol. 21 Issue: 1 p492-499, 8p
- Publication Year :
- 2021
-
Abstract
- Developing low-cost and efficient electrocatalysts to accelerate oxygen evolution reaction (OER) kinetics is vital for water and carbon-dioxide electrolyzers. The fastest-known water oxidation catalyst, Ni(Fe)OxHy, usually produced through an electrochemical reconstruction of precatalysts under alkaline condition, has received substantial attention. However, the reconstruction in the reported catalysts usually leads to a limited active layer and poorly controlled Fe-activated sites. Here, we demonstrate a new electrochemistry-driven F-enabled surface-reconstruction strategy for converting the ultrathin NiFeOxFynanosheets into an Fe-enriched Ni(Fe)OxHyphase. The activated electrocatalyst shows a low OER overpotential of 218 ± 5 mV at 10 mA cm–2and a low Tafel slope of 31 ± 4 mV dec–1, which is among the best for NiFe-based OER electrocatalysts. Such superior performance is caused by the effective formation of the Fe-enriched Ni(Fe)OxHyactive-phase that is identified by operandoRaman spectroscopy and the substantially improved surface wettability and gas-bubble-releasing behavior.
Details
- Language :
- English
- ISSN :
- 15306984 and 15306992
- Volume :
- 21
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Nano Letters
- Publication Type :
- Periodical
- Accession number :
- ejs54742002
- Full Text :
- https://doi.org/10.1021/acs.nanolett.0c03950