Published in Angew. Chem., we show that the behavior of gas bubbles exerts a strong influence on CO2 capture rates and Faradaic efficiencies. We demonstrate that eliminating bubble accumulation by suppressing H2 evolution at the cathode/electrolyte interface facilitates CO2 capture, which ensures the access of CO2 to the alkaline electrode surfaces. We devise a polymer-electrolyte CO2 capture reactor outperforming existing electrochemical DAC devices.
