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| Home > Publications database > Direct Electroreduction of CO2 to Formic Acid in a Three-Compartment Electrolyzer using PiperION Anion Exchange Membranes |
| Home > Publications database > Direct Electroreduction of CO2 to Formic Acid in a Three-Compartment Electrolyzer using PiperION Anion Exchange Membranes |
| Conference Presentation (After Call) | FZJ-2026-03310 |
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2026
Abstract: The electrochemical reduction of CO2 (eCO2RR) to organic base and platform chemicals holds potential to enable a circular carbon economy. Specifically, eCO2RR to formic acid promises to become cost-competitive with the energy-intensive conventional production process. Our work focuses on a direct formic acid production reactor that operates solely on CO2 and deionized water feed. This electrolyzer design reduces downstream purification costs due to the high concentration of the product in the acidic form at the outlet (> 15wt%) and the absence of a metal-based electrolyte. It features three compartments separated by a cation and an anion exchange membrane (AEM), and collects formic acid solution in the middle compartment. Herein, we report operation at the highest current densities ever reported to date with this electrolyzer design while maintaining high Faradaic efficiencies to formic acid, energy efficiencies, and product concentrations utilizing a PiperION AEM instead of Sustainion AEM. Paramount to cell efficiency is the choice of an optimal AEM thickness that shields the cathode from the acidic center compartment while enabling the transport of cathode-generated anions across the AEM to the center compartment.
Keyword(s): Energy (1st) ; Chemistry (2nd)
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