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

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2021-09, Vol.420, p.127706, Article 127706
• Main Authors: Lee, Seokhee, Woo, Sung Hun, Shin, Tae Ho, Irvine, John T.S.
• Format: Article
• Language: English
• Subjects: (La0.75Sr0.25)0.97Cr0.5Mn0.5O3; Ce0.8Gd0.2O1.9; Co-infiltration; Nanocatalysts; Solid oxide electrolysis cells
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2020.127706

[Display omitted] •Pd-GDC co-infiltrated LSCM cathode for the high-temperature CO2 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, CO2 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 CO2 using a highly efficient solid oxide electrolyzer could be considered an alternative to the advanced utilization of CO2. The La(Sr)Cr(Mn)O3 (LSCM) perovskite oxide has previously been examined as a promising ceramic cathode material for application in a CO2 solid oxide electrolyzer at high temperatures. However, LSCM suffers from low electrocatalytic activity towards CO2 reduction. In this study, a modified LSCM-based cathode material is fabricated by co-infiltrating Pd metal and Ce0.8Gd0.2O1.9 (GDC) nanoparticles on the surface of the LSCM scaffold. Structural characterization and electrochemical analysis of the high-temperature CO2 electrolysis procedure are conducted for various CO/CO2 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.