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Robust oxide electrodes with high activity and durability have attracted significant attention as alternatives for Ni‐based cathodes in high‐temperature solid oxide electrolysis cells (SOECs). Noncoking La(Sr)Cr(Mn)O3 (LSCM)‐based oxide cathodes have shown promise as durable ceramic cathodes; however, they suffer from low electrocatalytic activities in electrochemical CO2 reduction. In this study, a dual‐phase composite electrode consisting of LSCM and Ce(Mn, Fe)O2 (CMF) is developed to enhance the electrocatalytic activity of CO2 reduction in SOECs. The developed electrode shows excellent electrolysis performance of 2.64 and 1.22 A cm–2 at 1123 K, when voltages of 1.5 and 1.2 V are applied, respectively, without using any precious metal catalysts. The enhanced electrolysis performance is attributed to increases in electrocatalytic activity and surface oxygen vacancies caused by the CMF, which accelerates CO2 adsorption and results in the subsequent dissociation of the carbonate intermediate in the CO2 reduction. [ABSTRACT FROM AUTHOR]

[Display omitted] • Pd-GDC co-infiltrated LSCM cathode for the high-temperature CO 2 electrolysis was invesigated. • Pd-GDC@LSCM material presented highly dispersed Pd-GDC nanoparticles on LSCM. • This structure extended the triple-phase boundaries to enhance the electrochemical activity. • Using the Pd-GDC@LSCM electrode, CO 2 was reduced at a rate of 2362 μmol cm−2 min−1 at 1123 K. • It is possible to achieve preliminary performance through the Pd-GDC nanoparticles onto the LSCM. The electrochemical reduction of CO 2 using a highly efficient solid oxide electrolyzer could be considered an alternative to the advanced utilization of CO 2. The La(Sr)Cr(Mn)O 3 (LSCM) perovskite oxide has previously been examined as a promising ceramic cathode material for application in a CO 2 solid oxide electrolyzer at high temperatures. However, LSCM suffers from low electrocatalytic activity towards CO 2 reduction. In this study, a modified LSCM-based cathode material is fabricated by co-infiltrating Pd metal and Ce 0.8 Gd 0.2 O 1.9 (GDC) nanoparticles on the surface of the LSCM scaffold. Structural characterization and electrochemical analysis of the high-temperature CO 2 electrolysis procedure are conducted for various CO/CO 2 mixtures and at different operating temperatures. The enhanced electrocatalytic activity of the Pd-GDC co-infiltrated LSCM cathode compared to LSCM is attributed to the increased numbers of active triple phase boundaries and surface oxygen vacancies resulting from the co-infiltration of Pd-GDC nanoparticles on the LSCM cathode. [ABSTRACT FROM AUTHOR]