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

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.

Automated summary

The study presented a process for electrocatalytic reduction of CO2 to formate in a continuous manner, using Bi carbon-supported nanoparticles. The process showed high HCOO- concentration, Faradaic Efficiency, and energy efficiency, making it a promising approach for future industrial implementation.