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Tailoring Cu Electrodes for Enhanced CO 2 Electroreduction through Plasma Electrolysis in Non‐Conventional Phosphorus‐Oxoanion‐Based Electrolytes

Elnagar, Mohamed M.; Menezes, Pramod V.; Parada, Walter A.; Mattausch, Yannick; Kibler, Ludwig A.; Mayrhofer, Karl J. J.; Jacob, Timo 1
1 Karlsruher Institut für Technologie (KIT)

Abstract:

This study presents a green, ultra-fast, and facile technique for the fabrication of micro/nano-structured and porous Cu electrodes through in-liquid plasma electrolysis using phosphorous-oxoanion-based electrolytes. Besides the preferential surface faceting, the Cu electrodes exhibit unique surface structures, including octahedral nanocrystals besides nanoporous and microporous structures, depending on the employed electrolyte. The incorporation of P-atoms into the Cu surfaces is observed. The modified Cu electrodes display increased roughness, leading to higher current densities for CO2 electroreduction reaction. The selectivity of the modified Cu electrodes towards C2 products is highest for the Cu electrodes treated in Na2HPO3 and Na3PO4 electrolytes, whereas those treated in Na2H2PO2 produce the most H2. The Cu electrode treated in Na3PO4 produces ethylene (23 %) at −1.1 V vs. RHE, and a comparable amount of acetaldehyde (15 %) that is typically observed for Cu(110) single crystals. The enhanced selectivity is attributed to several factors, including the surface morphology, the incorporation of phosphorus into the Cu structure, and the formation of Cu(110) facets. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000162183
Veröffentlicht am 21.09.2023
Originalveröffentlichung
DOI: 10.1002/cssc.202300934
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 1864-5631, 1864-564X
KITopen-ID: 1000162183
HGF-Programm 38.02.02 (POF IV, LK 01) Components and Cells
Erschienen in ChemSusChem
Verlag Wiley-VCH Verlag
Band 16
Heft 23
Seiten e202300934
Vorab online veröffentlicht am 06.08.2023
Nachgewiesen in Dimensions
Web of Science
Scopus
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