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Operando‐Untersuchung von Ag‐dekorierten Cu2O‐Nanowürfel‐Katalysatoren mit verbesserter CO2‐Elektroreduktion zu Flüssigprodukten

MPS-Authors
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Herzog,  Antonia
Interface Science, Fritz Haber Institute, Max Planck Society;

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Bergmann,  Arno
Interface Science, Fritz Haber Institute, Max Planck Society;

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Jeon,  Hyosang
Interface Science, Fritz Haber Institute, Max Planck Society;

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Timoshenko,  Janis
Interface Science, Fritz Haber Institute, Max Planck Society;

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Kühl,  Stefanie
Interface Science, Fritz Haber Institute, Max Planck Society;

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Rettenmaier,  Clara
Interface Science, Fritz Haber Institute, Max Planck Society;

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Lopez-Luna,  Mauricio
Interface Science, Fritz Haber Institute, Max Planck Society;

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Haase,  Felix
Interface Science, Fritz Haber Institute, Max Planck Society;

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Roldan Cuenya,  Beatriz
Interface Science, Fritz Haber Institute, Max Planck Society;

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Citation

Herzog, A., Bergmann, A., Jeon, H., Timoshenko, J., Kühl, S., Rettenmaier, C., et al. (2021). Operando‐Untersuchung von Ag‐dekorierten Cu2O‐Nanowürfel‐Katalysatoren mit verbesserter CO2‐Elektroreduktion zu Flüssigprodukten. Angewandte Chemie. doi:/10.1002/ange.202017070.


Cite as: http://hdl.handle.net/21.11116/0000-0007-F818-7
Abstract
Direct conversion of carbon dioxide into multicarbon liquid fuels by the CO2 electrochemical reduction reaction (CO2RR) can contribute to the decarbonization of the global economy. Here, well‐defined Cu2O nanocubes (NCs, 35 nm) uniformly covered with Ag nanoparticles (5 nm) were synthesized. When compared to bare Cu2O NCs, the catalyst with 5 at% Ag on Cu2O NCs displayed a two‐fold increase in the Faradaic efficiency for C2+ liquid products (30% at ‐1.0 VRHE), including ethanol, 1‐propanol, and acetaldehyde, while formate and hydrogen were suppressed. Operando X‐ray absorption spectroscopy revealed the partial reduction of Cu2O during CO2RR, accompanied by a reaction‐driven redispersion of Ag on the CuOx NCs. Operando surface‐enhanced Raman spectroscopy data further uncovered significant variations in the CO binding to Cu, which were assigned to Ag‐Cu sites formed during CO2RR that appear crucial for the C‐C coupling and the enhanced yield of liquid products.