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  Voltage- and time-dependent valence state transition in cobalt oxide catalysts during the oxygen evolution reaction

Zhou, J., Zhang, L., Huang, Y.-C., Dong, C.-L., Lin, H.-J., Chen, C.-T., et al. (2020). Voltage- and time-dependent valence state transition in cobalt oxide catalysts during the oxygen evolution reaction. Nature Communications, 11: 1984, pp. 1-10. doi:10.1038/s41467-020-15925-2.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-52DB-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-52DD-5
Genre: Journal Article

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 Creators:
Zhou, Jing1, Author
Zhang, Linjuan1, Author
Huang, Yu-Cheng1, Author
Dong, Chung-Li1, Author
Lin, Hong-Ji1, Author
Chen, Chien-Te1, Author
Tjeng, L. H.2, Author              
Hu, Zhiwei3, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              
3Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              

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 Abstract: The ability to determine the electronic structure of catalysts during electrochemical reactions is highly important for identification of the active sites and the reaction mechanism. Here we successfully applied soft X-ray spectroscopy to follow in operando the valence and spin state of the Co ions in Li2Co2O4 under oxygen evolution reaction (OER) conditions. We have observed that a substantial fraction of the Co ions undergo a voltage-dependent and time-dependent valence state transition from Co3+ to Co4+ accompanied by spontaneous delithiation, whereas the edge-shared Co–O network and spin state of the Co ions remain unchanged. Density functional theory calculations indicate that the highly oxidized Co4+ site, rather than the Co3+ site or the oxygen vacancy site, is mainly responsible for the high OER activity. © 2020, The Author(s).

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Language(s): eng - English
 Dates: 2020-04-242020-04-24
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1038/s41467-020-15925-2
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 11 Sequence Number: 1984 Start / End Page: 1 - 10 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723