Recent advances of perovskite oxide-based cathodes in solid oxide electrolysis cells for CO2 electroreduction

CO2 reduction plays a vital role in carbon capture, utilization and storage (CCUS), whereas electroreduction method has attracted considerable attention because of its high selectivity, safety, and energy efficiency. Solid oxide electrolysis cells (SOECs) have exhibited significant advantages in CO2 reduction and utilization. Among all the components of SOEC, the cathode materials are crucial due to the complex mechanism and harsh working conditions at the cathode. Perovskite oxide-based cathodes show great prospect for CO2 conversion with excellent catalytic activity, redox stability, and coking resistance compared to conventional cermet cathodes. This review mainly summaries the recent research progress on the CO2 reduction mechanism and the electrochemical performance of various perovskite cathodes. The effect of different modification methods on the performance of perovskite cathodes is explored, and the possible solutions to degradation are discussed. The common problems of perovskite cathodes and improving methods are also suggested in this review.