Performing electrocatalytic CO2 reduction reactions at a high pressure

Abstract Electrocatalytic CO 2 reduction technology offers an effective way to convert CO 2 into valuable chemicals and fuels, presenting a sustainable solution for carbon emissions. Current electrocatalytic CO 2 reduction technologies encounter significant issues such as salt precipitation and hydrogen evolution, which prevent energy conversion efficiency, selectivity, current density, and stability from simultaneously meeting industrial standards. In recent years, researchers have discovered that increasing the CO 2 pressure on the gas supply could enhance the coverage of the catalyst and activate more CO 2 reduction reaction sites on the catalyst surface, which provides a practical and effective approach for optimizing the energy conversion and mass transfer. In this review, we provide a comprehensive review of the development history and current status of high-pressure CO 2 electrocatalytic reduction technology, focusing on its reaction devices, catalytic performance, and reaction mechanisms. Furthermore, we summarize and offer insights into the most promising research avenues to propel the field forward.