Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.367
Publication date: 18th December 2023
Electrolyte effect in electrochemical reduction of CO2 on Cu electrode.
Amanda C. Garcia
a.c.garcia@uva.nl
This lecture delves into the core principles underlying the electrochemical reduction of carbon dioxide (CO2RR) and its interaction with the hydrogen evolution reaction (HER). Our focus centers on our group's extensive exploration of CO2RR on copper electrodes, especially in organic solvents.
Employing online gas chromatography techniques, our findings highlight the profound influence of electrode morphology and solvent composition on this reaction. Notably, in organic solvents such as acetonitrile, our in situ FTIR measurements elucidate the critical role of water content at the solid-liquid interface in shaping reaction selectivity. Moreover, we unveil that the CO2 reduction reaction impedes HER in these conditions.
Extending prior observations in aqueous solvents, our investigation reveals the decisive impact of alkyl cation length—commonly employed as an electrolyte in organic solvents—on dictating the reaction mechanism. Specifically, our research showcases that smaller cations (TEA) promote oxalic acid formation, while the largest cation (TBA) favors carbon monoxide production.
This lecture will leverage in situ spectroscopic techniques alongside DFT calculations to elucidate the intricate mechanism behind these reactions and unravel the pivotal role of the cation in determining product distribution.
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