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Ultrathin Spinel‐Structured Nanosheets Rich in Oxygen Deficiencies for Enhanced Electrocatalytic Water Oxidation
Abstract
Electrochemical water splitting is a clean technology for H2 fuels, but greatly hindered by the slow kinetics of the oxygen evolution reaction (OER). Herein, a series of spinel-structured nanosheets with oxygen deficiencies and ultrathin thicknesses were designed to increase the reactivity and the number of active sites of the catalysts, which were then taken as an excellent platform for promoting the water oxidation process. Theoretical investigations showed that the oxygen vacancies confined in the ultrathin nanosheet could lower the adsorption energy of H2O, leading to increased OER efficiency. As expected, the NiCo2O4 ultrathin nanosheets rich in oxygen vacancies exhibited a large current density of 285 mA cm(-2) at 0.8 V and a small overpotential of 0.32 V, both of which are superior to the corresponding values of bulk samples or samples with few oxygen deficiencies and even higher than those of most reported non-precious-metal catalysts. This work should provide a new pathway for the design of advanced OER catalysts.
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“the peak at 530.1 eV is attributed to the oxygen atoms bound to the metal (labeled O1)”
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“the peak at 531.3 eV is attributed to the high concentration of oxygen vacancies (labeled O2) [54,55]”
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Metadata
- Authors
- Bao, J., Zhang, X., Fan, B., Zhang, J., Zhou, M., Yang, W., Hu, X., Wang, H., Pan, B., & Xie, Y.
- Affiliations
- University of Science and Technology of China (CN)
- Technische Universität Ilmenau (DE)
- Corresponding author
- Zhang, Xiaodong
- Xie, Yi
- Venue
- Angewandte Chemie International Edition
- Publisher
- Wiley
- Published
- 2015-05-07
- Volume
- 54
- Issue
- 25
- Pages
- 7399-7404
- ISSN
- 1433-7851 (ISSN-L)
- 1521-3773
- OpenAlex
- W2151061566
- Cited by
- 1,428
- References
- 34
- Citations by year
- 2026: 55 · 2025: 90 · 2024: 123 · 2023: 120 · 2022: 153 · 2021: 174 · 2020: 196 · 2019: 187 · 2018: 156 · 2017: 105 · 2016: 55 · 2015: 14
- FWCI
- 32.52
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Angewandte Chemie International Edition (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
- Physical Sciences › Materials Science › Materials Chemistry › Iron oxide chemistry and applications
- Keywords
- oxygen evolution reaction, electrocatalytic water oxidation, oxygen vacancies, ultrathin nanosheets, NiCo2O4, non-noble metal catalysts, water splitting, hydrogen production, water adsorption energy
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