Boosting CO2 directly electrolysis by electron doping in Sr2Fe1.5Mo0.5O6-δ double perovskite cathode

Commercialization of solid oxide electrolysis cell (SOEC) depends on the development of cathode materials with outstanding catalytic activity for CO2 electroreduction. Herein, Pure La-doped Sr2-xLaxFe1.5Mo0.5O6-δ double perovskite oxide is prepared via the citric acid-glycine method and used as a cathode to evaluate its electrochemical performance for CO2 electrolysis. La substitution at Sr-site promotes the oxygen surface exchange and bulk diffusion in Sr2-xLaxFe1.5Mo0.5O6-δ oxide, leading to higher CO2 electrolysis performance compared to Sr2Fe1.5Mo0.5O6-δ parent oxide. At 850 °C and 1.5 V, a current density of −2760 mA cm−2 is obtained on an LSGM-supported single cell with Sr1.9La0.1Fe1.5Mo0.5O6-δ cathode. In addition, the electrolysis cell displays excellent stability under a constant voltage of 1.2 V, suggesting that Sr1.9La0.1Fe1.5Mo0.5O6-δ oxide is a promising SOEC cathode material for pure CO2 electrolysis.