Plasma‐Engraved Co3O4 Nanosheets with Oxygen Vacancies and High Surface Area for the Oxygen Evolution Reaction
Abstract
Co3 O4 , which is of mixed valences Co(2+) and Co(3+) , has been extensively investigated as an efficient electrocatalyst for the oxygen evolution reaction (OER). The proper control of Co(2+) /Co(3+) ratio in Co3 O4 could lead to modifications on its electronic and thus catalytic properties. Herein, we designed an efficient Co3 O4 -based OER electrocatalyst by a plasma-engraving strategy, which not only produced higher surface area, but also generated oxygen vacancies on Co3 O4 surface with more Co(2+) formed. The increased surface area ensures the Co3 O4 has more sites for OER, and generated oxygen vacancies on Co3 O4 surface improve the electronic conductivity and create more active defects for OER. Compared to pristine Co3 O4 , the engraved Co3 O4 exhibits a much higher current density and a lower onset potential. The specific activity of the plasma-engraved Co3 O4 nanosheets (0.055 mA cm(-2) BET at 1.6 V) is 10 times higher than that of pristine Co3 O4 , which is contributed by the surface oxygen vacancies.
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Oxygen vacancies can boost the pre-oxidation of Co2+ at lower potentials, thereby generating more Co-OOH species that are beneficial for the OER catalytic process.
“the oxygen vacancies can boost the pre-oxidation of Co2+ at lower potentials hence generating more Co-OOH species, which are beneficial for the OER catalytic process”
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- Authors
- Xu, L., Jiang, Q., Xiao, Z., Li, X., Huo, J., Wang, S., & Dai, L.
- Affiliations
- Hunan University (CN)
- Case Western Reserve University (US)
- Corresponding author
- Wang, Shuangyin
- Venue
- Angewandte Chemie International Edition
- Publisher
- Wiley
- Published
- 2016-03-17
- Volume
- 55
- Issue
- 17
- Pages
- 5277-5281
- ISSN
- 1433-7851 (ISSN-L)
- 1521-3773
- OpenAlex
- W2302107358
- Cited by
- 2,073
- References
- 0
- Citations by year
- 2026: 80 · 2025: 122 · 2024: 189 · 2023: 217 · 2022: 217 · 2021: 269 · 2020: 318 · 2019: 276 · 2018: 229 · 2017: 124 · 2016: 32
- FWCI
- 59.73
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Angewandte Chemie International Edition (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Natural Science Foundation of China (51402100, 21573066)
- 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 › Electronic, Optical and Magnetic Materials › Supercapacitor Materials and Fabrication
- Keywords
- Co3O4, oxygen evolution reaction, oxygen vacancies, Co2+/Co3+ ratio, nanosheets, electrocatalysts, surface area, electronic conductivity, defect engineering
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