Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.228
Publication date: 18th December 2023
CO2 reduction reaction (CO2R) in acidic media is one of the alternatives to overcome low carbon utilization efficiencies and energy penalties due to the carbonate formation in an alkaline/neutral environment. In acid electrolytes the hydrogen evolution reaction (HER) is kinetically more favorable, limiting the conversion of CO2 in C2+ products. Modulating the reaction microenvironment at the catalyst-electrolyte interface with inorganic and organic components is a strategy to promote the reaction activity, selectivity, and stability [1-3]. Here, we report a CO2R reaction environment modulation strategy consisting of a polymer heterojunction coating that (1) increases local CO2 availability; (2) stabilizes CO2 reaction intermediates, leading to a high *CO coverage and improved C-C coupling in acid; and (3) regulates local proton activity with dedicated functional groups – as demonstrated by a combination of operando Raman spectroscopy and electrochemical characterizations. The polymer-coated PTFE/copper electrodes achieve a multicarbon Faradaic efficiency of 60% at 300 mA cm−2 in acidic media.
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