Pd and GDC Co-infiltrated LSCM cathode for high-temperature CO2 electrolysis using solid oxide electrolysis cells

Abstract

• 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.