Platinum‐Decorated Ceria Enhances CO2 Electroreduction in Solid Oxide Electrolysis Cells

Abstract

CO 2 electroreduction by solid oxide electrolysis cells (SOECs) can not only attenuate the greenhouse effect, but also convert surplus electrical energy into chemical energy. The adsorption and activation of CO 2 on the cathode play an important role in the SOEC performance. La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3‐δ ‐Ce 0.8 Sm 0.2 O 2‐δ (LSCF‐SDC) is a promising SOEC cathode, however, its electrocatalytic activity still needs to be improved. Herein, Pt/SDC interface was constructed by decorating Pt nanoparticles onto SDC surface. Electrochemical measurements indicate that the polarization resistance of SOEC is decreased from 0.308 to 0.120 Ω cm 2 , and the current density is improved from 0.913 to 1.42 A cm ‐2 at 1.6 V and 800 °C. Physicochemical characterizations suggest that the construction of Pt/SDC interface increases oxygen vacancy concentration on the cathode and boost CO 2 adsorption and dissociation, which leads to enhanced CO 2 electroreduction performance in SOECs.