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  Revealing the Active Phase of Copper during the Electroreduction of CO2 in Aqueous Electrolyte by Correlating In Situ X-ray Spectroscopy and In Situ Electron Microscopy

Velasco-Velez, J. J., Mom V, R., Sandoval-Diaz, L.-E., Falling, L. J., Chuang, C.-H., Gao, D., et al. (2020). Revealing the Active Phase of Copper during the Electroreduction of CO2 in Aqueous Electrolyte by Correlating In Situ X-ray Spectroscopy and In Situ Electron Microscopy. ACS Energy Letters, 5(6), 2106-2111. doi:10.1021/acsenergylett.0c00802.

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Velasco-Velez, Juan Jesus1, Author           
Mom V, Rik2, Author
Sandoval-Diaz, Luis-Ernesto2, Author
Falling, Lorenz J.2, Author
Chuang, Cheng-Hao2, Author
Gao, Dunfeng3, Author           
Jones, Travis E.2, Author
Zhu, Qingjun3, Author           
Arrigo, Rosa4, Author           
Cuenya, Beatriz Roldan2, Author
Knop-Gericke, Axel1, 3, Author           
Lunkenbein, Thomas3, Author           
Schlögl, Robert1, 3, Author           
Affiliations:
1Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society, ou_3023874              
2external, ou_persistent22              
3Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
4External Organizations, ou_persistent22              

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 Abstract: The variation in the morphology and electronic structure of copper during the electroreduction of CO2 into valuable hydrocarbons and alcohols was revealed by combining in situ surface- and bulk-sensitive X-ray spectroscopies with electrochemical scanning electron microscopy. These experiments proved that the electrified interface surface and near-surface are dominated by reduced copper. The selectivity to the formation of the key C-C bond is enhanced at higher cathodic potentials as a consequence of increased copper metallicity. In addition, the reduction of the copper oxide electrode and oxygen loss in the lattice reconstructs the electrode to yield a rougher surface with more uncoordinated sites, which controls the dissociation barrier of water and CO2. Thus, according to these results, copper oxide species can only be stabilized kinetically under CO2 reduction reaction conditions.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: ACS Energy Letters
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 5 (6) Sequence Number: - Start / End Page: 2106 - 2111 Identifier: ISSN: 2380-8195
CoNE: https://pure.mpg.de/cone/journals/resource/2380-8195