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  CO2 electroreduction on copper-cobalt nanoparticles: Size and composition effect

Bernal, M., Bagger, A., Scholten, F., Sinev, I., Bergmann, A., Ahmadi, M., et al. (2018). CO2 electroreduction on copper-cobalt nanoparticles: Size and composition effect. Nano Energy, 53, 27-36. doi:10.1016/j.nanoen.2018.08.027.

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Genre: Journal Article

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 Creators:
Bernal, Miguel1, Author
Bagger, Alexander2, Author
Scholten, Fabian1, Author
Sinev, Ilya1, Author
Bergmann, Arno3, Author           
Ahmadi, Mahdi1, 4, Author
Rossmeisl, Jan4, Author
Roldan Cuenya, Beatriz1, 3, 4, Author           
Affiliations:
1Department of Physics, Ruhr-University Bochum, 44780 Bochum, Germany, ou_persistent22              
2Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen, Denmark, ou_persistent22              
3Interface Science, Fritz Haber Institute, Max Planck Society, ou_2461712              
4Department of Physics, University of Central Florida, 32816 Orlando, USA, ou_persistent22              

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 Abstract: Understanding the changes that a catalyst may experience on its surface during a reaction is crucial in order to establish structure/composition-reactivity correlations. Here, we report on bimetallic size-selected Cu100-xCox nanoparticle (NP) catalysts for CO2 electroreduction reaction (CO2RR) and we identify the optimum Cu/Co ratio and NP size leading to improved activity and selectivity. Operando X-ray absorption spectroscopy (XAS) and quasi in situ X-ray photoelectron spectroscopy (XPS) provided insight into the morphological, structural, and chemical transformations underwent by the CuCo NPs during CO2RR. We illustrate that the as-prepared state of the bimetallic NPs is drastically different from the structure and surface composition of the working catalyst. Under electrochemical conditions, a reduction of both initially oxidized metallic species was observed, accompanied by Cu surface segregation. Density functional theory (DFT) results from a Cu3X model were used to describe the surface segregation. In order to extract mechanistic understanding, the activity of the experimental Cu and CuCo NPs towards CO2RR was described via DFT in terms of the interaction of Cu facets under expansion and compression with key reaction intermediates, in particular CO* and COOH*.

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Language(s): eng - English
 Dates: 2018-08-122018-07-172018-08-142018-08-162018-11
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.nanoen.2018.08.027
 Degree: -

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Project name : OPERANDOCAT - In situ and Operando Nanocatalysis: Size, Shape and Chemical State Effects
Grant ID : 725915
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Nano Energy
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Amsterdam : Elsevier
Pages: 10 Volume / Issue: 53 Sequence Number: - Start / End Page: 27 - 36 Identifier: Other: 2211-2855
CoNE: https://pure.mpg.de/cone/journals/resource/2211-2855