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Improving trade-offs in the figures of merit of gas-phase single-pass continuous CO2 electrocatalytic reduction to formate

Abstract: The electrochemical conversion of CO2 is gaining increasing attention because it could be considered as an appealing strategy for making value-added products at mild conditions from CO2 captured. In this work, we report a process for the electrocatalytic reduction of CO2 to formate (HCOO-) operating in a continuous way, employing a single pass of the reactants through the electrochemical reactor and using Bi carbon supported nanoparticles in the form of a membrane electrode assembly composed by a Gas Diffusion Electrode, a current collector and a cationic exchange membrane. This contribution presents the best trade-off between HCOO- concentration, Faradaic Efficiency and energy consumption in the literature. We also show noteworthy values of energy consumption required of only 180 kWh·kmol-1 of HCOO-, lower than previous approaches, working at current densities that allow achieving formate concentration higher than 300 g·L-1 and simultaneously, a Faradaic Efficiency close to 90%. The results here displayed make the electrochemical approach closer for future implementation at the industrial scale.

 Autoría: Díaz-Sainz G., Alvarez-Guerra M., Ávila-Bolívar B., Solla-Gullón J., Montiel V., Irabien A.,

 Fuente: Chemical Engineering Journal, 2021, 405, 126965

 Editorial: Elsevier

 Fecha de publicación: 01/02/2021

 Nº de páginas: 28

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.cej.2020.126965

 ISSN: 1385-8947,1873-3212

 Proyecto español: CTQ2016-76231-C2-1-R ; CTQ2016-76231-C2-2-R

 Url de la publicación: https://doi.org/10.1016/j.cej.2020.126965