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Efficient Electrocatalytic CO2 Reduction Driven by Ionic Liquid Buffer?Like Solutions

Goncalves, Wellington D. G.; Zanatta, Marcileia; Simon, Nathalia M.; Rutzen, Luciane M.; Walsh, Darren A.; Dupont, Jairton


Wellington D. G. Goncalves

Marcileia Zanatta

Nathalia M. Simon

Luciane M. Rutzen

Jairton Dupont


We show here that electrocatalysis of CO2 reduction in aqueous electrolytes containing the ionic liquid (IL) 1-n-butyl-2,3dimethylimidazolium acetate ([BMMIm][OAc]) and dimethyl sulfoxide (DMSO) proceeds at low overpotentials (−0.9 V vs. Ag/AgCl) at commercially-available Au electrodes, and with high selectivity for CO production (58% faradaic efficiency at –1.6 V vs Ag/AgCl). 0.43 mol of CO2 per mol of IL can be absorbed into the electrolyte at atmospheric pressure, forming bicarbonate and providing a constant supply of dissolved CO2 to the surface of the electrode. We also show that electrocatalysis of CO2 reduction in the electrolyte is facilitated by stabilization of CO2 radical anions by the imidazolium cations of the IL and buffer-like effects with bicarbonate.


Goncalves, W. D. G., Zanatta, M., Simon, N. M., Rutzen, L. M., Walsh, D. A., & Dupont, J. (2019). Efficient Electrocatalytic CO2 Reduction Driven by Ionic Liquid Buffer?Like Solutions. ChemSusChem, 12(18), 4170-4175.

Journal Article Type Article
Acceptance Date Jul 4, 2019
Online Publication Date Jul 4, 2019
Publication Date Sep 20, 2019
Deposit Date Jul 9, 2019
Publicly Available Date Jul 5, 2020
Journal ChemSusChem
Print ISSN 1864-5631
Electronic ISSN 1864-564X
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 12
Issue 18
Pages 4170-4175
Keywords General Energy; General Materials Science; General Chemical Engineering; Environmental Chemistry
Public URL
Publisher URL
Additional Information This is the peer reviewed version of the following article: Dupont, J. , Goncalves, W. ., Zanatta, M. , Simon, N. ., Rutzen, L. . and Walsh, D. . (2019), Efficient electrocatalytic CO2 reduction driven by ionic liquid buffer?like solutions. ChemSusChem. Accepted Author Manuscript. doi:10.1002/cssc.201901076, which has been published in final form at ttps:// This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.


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