Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.071
Publication date: 18th July 2023
CO2 electroreduction into valuable hydrocarbons with high selectivity is of high market interest yet challenging. Cu-based catalysts have a unique catalytic activity towards hydrocarbon (C2+) products in the CO2 electroreduction reaction and are widely studied to promote the corresponding selectivity and activity. The control of the oxidation state of the catalyst is essential in controlling the desired hydrocarbon production. Herein, we steer CO2 electroreduction towards ethylene production with high selectivity in an alkaline flow cell configuration from a copper phosphate catalyst. An optimum faradaic efficiency of 55% for ethylene production was obtained in a 7 M KOH electrolyte for a total current density of 150 mA.cm-2. A high faradaic efficiency for C2+ products of 60% was also obtained. The investigation of the mechanism shows that Cu nanoparticles are derived during electrolysis which may favour the dimerization of *CO to ethylene formation. This work provides new insights into designing catalysts for high-selectivity hydrocarbon formation.
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