Iridium Single Atoms Coupling with Oxygen Vacancies Boosts Oxygen Evolution Reaction in Acid Media
Open accessAbstract
Simultaneous realization of improved activity, enhanced stability, and reduced cost remains a desirable yet challenging goal in the search of electrocatalysis oxygen evolution reaction (OER) in acid. Herein, we report a novel strategy to prepare iridium single-atoms (Ir-SAs) on ultrathin NiCo 2 O 4 porous nanosheets (Ir–NiCo 2 O 4 NSs) by the co-electrodeposition method. The surface-exposed Ir-SAs couplings with oxygen vacancies (V O ) exhibit boosting the catalysts OER activity and stability in acid media. They display superior OER performance with an ultralow overpotential of 240 mV at j = 10 mA cm –2 and long-term stability of 70 h in acid media. The TOFs of 1.13 and 6.70 s –1 at an overpotential of 300 and 370 mV also confirm their remarkable performance. Density functional theory (DFT) calculations reveal that the prominent OER performance arises from the surface electronic exchange-and-transfer activities contributed by atomic Ir incorporation on the intrinsic V O existed NiCo 2 O 4 surface. The atomic Ir sites substantially elevate the electronic activity of surface lower coordinated Co sites nearby V O, which facilitate the surface electronic exchange-and-transfer capabilities. With this trend, the preferred H 2 O activation and stabilized *O have been reached toward competitively lower overpotential. This is a generalized key for optimally boosting OER performance.
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Ru- and Ir-based catalysts are the best oxygen evolution reaction electrocatalysts.
“Ru- and Ir-based catalysts are the best oxygen evolution reaction (OER) electrocatalysts”
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- Authors
- Yin, J., Jin, J., Lu, M., Huang, B., Zhang, H., Peng, Y., Xi, P., & Yan, C.-H.
- Affiliations
- State Key Laboratory of Applied Organic Chemistry (CN)
- Hong Kong Polytechnic University (HK)
- Lanzhou University (CN)
- Peking University (CN)
- Corresponding author
- Huang, Bolong
- Xi, Pinxian
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2020-09-21
- Volume
- 142
- Issue
- 43
- Pages
- 18378-18386
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W3087041690
- Cited by
- 545
- References
- 4
- Citations by year
- 2026: 52 · 2025: 83 · 2024: 101 · 2023: 129 · 2022: 115 · 2021: 65
- FWCI
- 15.27
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Licence
- Locations
- Journal of the American Chemical Society (publishedVersion)
- PubMed (publishedVersion)
- PolyU Institutional Research Archive (Hong Kong Polytechnic University) (submittedVersion)
- Lanzhou University Institutional Repository (submittedVersion)
- Funders
- State Administration of Foreign Experts Affairs (B20027)
- Research Grants Council, University Grants Committee (PolyU 253026/16P)
- National Natural Science Foundation of China (21922105, 21931001, 51771085, 51801088)
- Gansu Province (2019ZX?04)
- 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 › Catalytic Processes in Materials Science
- Keywords
- oxygen evolution reaction, iridium single atoms, oxygen vacancies, NiCo2O4 nanosheets, co-electrodeposition, water oxidation, electrocatalyst stability, transition metal single-atom catalysts
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