Cited by 1,094Electrocatalysts for Energy ConversionCO2 Reduction Techniques and CatalystsAdvanced Photocatalysis Techniques

Low Overpotential in Vacancy-Rich Ultrathin CoSe2 Nanosheets for Water Oxidation

Liu, Youwen, Cheng, Hao, Lyu, Mengjie, Fan, Shaojuan, Liu, Qinghua, Zhang, Wenshuai, Zhi, Yuduo, Wang, Chengming +4 more·2014·Journal of the American Chemical Society

Abstract

According to Yang Shao-Horn's principle, CoSe2 is a promising candidate as an efficient, affordable, and sustainable alternative electrocatalyst for the oxygen evolution reaction, owing to its well-suited electronic configuration of Co ions. However, the catalytic efficiency of pure CoSe2 is still far below what is expected, because of its poor active site exposure yield. Herein, we successfully overcome the disadvantage of insufficient active sites in bulk CoSe2 by reducing its thickness into the atomic scale rather than any additional modification (such as doping or hybridizing with graphene or noble metals). The positron annihilation spectrometry and XAFS spectra provide clear evidence that a large number of VCo″ vacancies formed in the ultrathin nanosheets. The first-principles calculations reveal that these VCo″ vacancies can serve as active sites to efficiently catalyze the oxygen evolution reaction, manifesting an OER overpotential as low as 0.32 V at 10 mA cm(-2) in pH 13 medium, which is superior to the values for its bulk counterparts as well as those for the most reported Co-based electrocatalysts. Considering the outstanding performance of the simple, unmodified ultrathin CoSe2 nanosheets as the only catalyst, further improvement of the catalytic activity is expected when various strategies of doping or hybridizing are used. These results not only demonstrate the potential of a notable, affordable, and earth-abundant water oxidation electrocatalyst based on ultrat…

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Crossref · 10.1021/ja5085157

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Authors
Liu, Y., Cheng, H., Lyu, M., Fan, S., Liu, Q., Zhang, W., Zhi, Y., Wang, C., Xiao, C., Wei, S., Ye, B., & Xie, Y.
Affiliations
University of Science and Technology of China (CN)
Corresponding author
  • Xiao, Chong
  • Wei, Shiqiang
  • Xie, Yi
Venue
Journal of the American Chemical Society
Published
2014-10-22
Volume
136
Issue
44
Pages
15670-15675
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2096975427
Cited by
1,094
References
41
Citations by year
2026: 24 · 2025: 57 · 2024: 80 · 2023: 86 · 2022: 93 · 2021: 122 · 2020: 139 · 2019: 112 · 2018: 136 · 2017: 123 · 2016: 83 · 2015: 37
FWCI
26.74
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of the American Chemical Society (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Ministry of Education of the People's Republic of China (WK 2060190020)
  • China Postdoctoral Science Foundation (2014M550347)
  • National Natural Science Foundation of China (11079004, 11135008, 11321503, 21331005, 90922016)
  • Chinese Academy of Sciences (XDB01020300)
  • Jiangsu Key Laboratory for Environment Functional Materials (SJHG1301)
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 › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
Keywords
CoSe2, ultrathin nanosheets, oxygen evolution reaction, water oxidation electrocatalysis, cobalt vacancies, active site exposure, overpotential, earth-abundant electrocatalysts, noble metal-free catalysts, positron annihilation spectroscopy, X-ray absorption spectroscopy, first-principles calculations

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