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  Potentialabhängige Morphologie von Kupferkatalysatoren während der Elektroreduktion von CO2, ermittelt durch In‐situ‐Rasterkraftmikroskopie

Simon, G. H., Kley, C., & Roldan Cuenya, B. (2020). Potentialabhängige Morphologie von Kupferkatalysatoren während der Elektroreduktion von CO2, ermittelt durch In‐situ‐Rasterkraftmikroskopie. Angewandte Chemie. doi:10.1002/ange.202010449.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-7F6F-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-9F41-D
Genre: Journal Article

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 Creators:
Simon, Georg Hermann1, Author              
Kley, Christopher1, 2, Author              
Roldan Cuenya, Beatriz1, Author              
Affiliations:
1Interface Science, Fritz Haber Institute, Max Planck Society, ou_2461712              
2Helmholtz Center Berlin for Materials and Energy, Hahn-Meitner Platz 1, 14109 Berlin, GERMANY, ou_persistent22              

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 Abstract: The unresolved dynamic morphology of copper electrodes during the electrochemical CO 2 reduction (CO 2 RR) impedes deriving structure‐reactivity relationships and controlling the catalytic properties of CO 2 RR electrocatalysts under operating conditions. We demonstrate that electrochemical atomic force microscopy (EC‐AFM) is a powerful tool for the real‐space characterization of catalysts under realistic CO 2 RR conditions. Despite the challenges related to imaging within a highly gas‐evolving potential regime (down to –1.1 V vs. the reversible hydrogen electrode), the evolution of structural features ranging from the micrometer to the atomic‐scale could be resolved during CO 2 RR. Using Cu(100) as model surface, distinct nanoscale surface morphologies and their potential‐dependent transformations from granular to smoothly curved mound‐pit surfaces or structures with rectangular terraces are revealed during CO 2 RR in 0.1 M KHCO 3 . The density of undercoordinated copper sites during CO 2 RR is shown to increase with decreasing potential. In situ atomic scale imaging reveals specific adsorption occurring at distinct cathodic potentials impacting the observed catalyst structure. These results show the complex interrelation of the morphology, structure, defect density, applied potential and electrolyte in copper CO 2 RR catalysts, which are key for understanding and controlling the catalyst selectivity.

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Language(s): eng - English
 Dates: 2020-09-172020-10-022020-10-09
 Publication Status: Published online
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/ange.202010449
 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: Angewandte Chemie
  Abbreviation : Angew. Chem.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: 8 Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ISSN: 0044-8249
CoNE: https://pure.mpg.de/cone/journals/resource/954926979058_1