Strategies to Enhance CO2 Electrochemical Reduction from Reactive Carbon Solutions.
Molecules
; 28(4)2023 Feb 18.
Article
em En
| MEDLINE
| ID: mdl-36838939
ABSTRACT
CO2 electrochemical reduction (CO2 ER) from (bi)carbonate feed presents an opportunity to efficiently couple this process to alkaline-based carbon capture systems. Likewise, while this method of reducing CO2 currently lags behind CO2 gas-fed electrolysers in certain performance metrics, it offers a significant improvement in CO2 utilization which makes the method worth exploring. This paper presents two simple modifications to a bicarbonate-fed CO2 ER system that enhance the selectivity towards CO. Specifically, a modified hydrophilic cathode with Ag catalyst loaded through electrodeposition and the addition of dodecyltrimethylammonium bromide (DTAB), a low-cost surfactant, to the catholyte enabled the system to achieve a FECO of 85% and 73% at 100 and 200 mA·cm-2, respectively. The modifications were tested in 4 h long experiments where DTAB helped maintain FECO stable even when the pH of the catholyte became more alkaline, and it improved the CO2 utilization compared to a system without DTAB.
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Base de dados:
MEDLINE
Assunto principal:
Carbono
/
Dióxido de Carbono
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article