1. Electrocatalytic Enhancement of CO Methanation at the Metal–Electrolyte Interface Studied Using In Situ X-ray Photoelectron Spectroscopy.
- Author
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Thurner, Christoph W., Haug, Leander, Winkler, Daniel, Griesser, Christoph, Leitner, Matthias, Moser, Toni, Werner, Daniel, Thaler, Marco, Scheibel, Lucas A., Götsch, Thomas, Carbonio, Emilia, Kunze-Liebhäuser, Julia, Portenkirchner, Engelbert, Penner, Simon, and Klötzer, Bernhard
- Subjects
METHANATION ,X-ray photoelectron spectroscopy ,COPPER ,CERAMIC metals - Abstract
For the direct reduction of CO
2 and H2 O in solid oxide electrolysis cells (SOECs) with cermet electrodes toward methane, a fundamental understanding of the role of elemental carbon as a key intermediate within the reaction pathway is of eminent interest. The present synchrotron-based in situ near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) study shows that alloying of Ni/yttria-stabilized-zirconia (YSZ) cermet electrodes with Cu can be used to control the electrochemical accumulation of interfacial carbon and to optimize its reactivity toward CO2 . In the presence of syngas, sufficiently high cathodic potentials induce excess methane on the studied Ni/yttria-stabilized-zirconia (YSZ)-, NiCu/YSZ- and Pt/gadolinium-doped-ceria (GDC) cermet systems. The hydrogenation of carbon, resulting from CO activation at the triple-phase boundary of Pt/GDC, is most efficient. [ABSTRACT FROM AUTHOR]- Published
- 2023
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