An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of CO2 
reduction at Cu in a SOE cell

Bozzini, Benedetto; Amati, Matteo; Mele, Claudio; Knop-Gericke, Axel; Vesselli, Erik

doi:10.1016/j.jelechem.2017.05.011

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An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of CO₂ reduction at Cu in a SOE cell

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Knop-Gericke, Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Bozzini, B., Amati, M., Mele, C., Knop-Gericke, A., & Vesselli, E. (2017). An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of CO₂ reduction at Cu in a SOE cell. Journal of Electroanalytical Chemistry, 799, 17-25. doi:10.1016/j.jelechem.2017.05.011.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-46E0-0

Abstract

The cathodic behavior of a model solid oxide electrolysis cell (SOEC) has been studied by means of nearambient pressure (NAP) X-ray Photoelectron Spectroscopy (XPS) and near edge X-ray absorption fine structure (NEXAFS), aiming at shedding light on the specific role of the metallic component in a class of cermets used as electrodes. The focus is on the surface chemistry and catalytic role of Cu, the increasingly popular metallic component in electrodes used in CO₂ electrolysis and CO₂/H₂O co-electrolysis. The NAPXPS and NEXAFS results, obtained in situ and operando conditions and under electrochemical control have provided important insights about the evolution of the Cu surface chemical composition. We have found that in dry CO₂ ambient carbon deposits are scavenged at low cathodic potential by the oxidising action of nascent O, while at high cathodic polarisations C grows due to activation of the CO reduction. Instead, in CO₂/H₂O mixtures, surface deposit of C is steady over the whole investigated potential range. The presence of adsorbed CO has also been detected during electrolysis of CO₂/H₂O mixtures, while no CO is found in pure CO₂ ambient.