Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.087
Publication date: 18th December 2023
Electrochemical carbon dioxide (CO2) conversion to multi-carbon (C2+) gas/liquid chemicals, such as ethylene (C2H4), offers a promising solution for the long-term and large-scale storage of sustainable energy. The viability of this approach requires further progress in terms of combined high selectivity at a high current density, and carbon efficiency. Today, this is challenged by the favorable conversion of CO2 into carbonates in the OH- rich environments associated to high current density operation. Here, we present an heterostructured core-shell structured Cu-based catalyst that enables control over the local OH- and carbonate balance, and improved *CO and *CO2·- coverage – as revealed by a suite operando Raman spectroscopy, pre and postmortem characterization, and electrochemical studies. The resulting gas diffusion cathode electrodes, implemented in a bipolar membrane configuration, achieve a 40% Faradic Efficiency towards C2H4 at a 1-A×cm-2 current density. The robustness of the catalyst is proved by 30 hours continuous electrochemical stability measurement performance.
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