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Enhanced Stability and CO/Formate Selectivity of Plasma-Treated SnOx/AgOx Catalysts during CO2 Electroreduction

MPG-Autoren
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Scholten,  Fabian
Interface Science, Fritz Haber Institute, Max Planck Society;
Department of Physics, Ruhr-University Bochum, 44780 Bochum, Germany;

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Sinev,  Ilya
Interface Science, Fritz Haber Institute, Max Planck Society;
Department of Physics, Ruhr-University Bochum, 44780 Bochum, Germany;

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Roldan Cuenya,  Beatriz
Interface Science, Fritz Haber Institute, Max Planck Society;
Department of Physics, Ruhr-University Bochum, 44780 Bochum, Germany;

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Zitation

Choi, Y.-W., Scholten, F., Sinev, I., & Roldan Cuenya, B. (2019). Enhanced Stability and CO/Formate Selectivity of Plasma-Treated SnOx/AgOx Catalysts during CO2 Electroreduction. Journal of the American Chemical Society, 141(13), 5261-5266. doi:10.1021/jacs.8b12766.


Zitierlink: https://hdl.handle.net/21.11116/0000-0003-3A16-4
Zusammenfassung
CO2 electroreduction into useful chemicals and fuels is a promising technology that might be used to minimize the impact that the increasing industrial CO2 emissions are having on the environment. Although plasma-oxidized silver surfaces were found to display a considerably decreased overpotential for the production of CO, the hydrogen evolution reaction (HER), a competing reaction against CO2 reduction, was found to increase over time. More stable and C1-product-selective SnOx/AgOx catalysts were obtained by electrodepositing Sn on O2-plasma-pretreated Ag surfaces. In particular, a strong suppression of HER (below 5% Faradaic efficiency (FE) at −0.8 V vs the reversible hydrogen electrode, RHE) during 20 h was observed. Ex situ scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDS), quasi in situ X-ray photoelectron spectroscopy (XPS), and operando X-ray absorption near-edge structure spectroscopy (XANES) measurements showed that our synthesis led to a highly roughened surface containing stable Snδ+/Sn species that were found to be key in the enhanced activity and stable CO/formate (HCOO-) selectivity. Our study highlights the importance of roughness, composition, and chemical state effects in CO2 electrocatalysis.