Reinforced chemical adsorption ability for efficient CO2 electrolysis in solid oxide electrolysis cell via a dual-exsolution strategy

Accelerating sluggish kinetics of CO2 2 reduction reaction (CO2RR) is of great importance for efficiently converting CO2 2 into valuable chemical products in solid oxide electrolysis cells (SOECs). Here, a novel dual-exsolution strategy is proposed to enhance CO2 2 electrolysis properties of La 0.4 Sr 0.6 Co 0.2 Fe 0.7 Nb 0.1 O 3-s (LSCFN) cathode. With simultaneously exsolved CoFe alloy and Bi nanoparticles on LSCFN cathodic matrix, the as-prepared SOEC delivers a high current density of 539 mA cm-- 2 for CO2 2 electrolysis at 800 degrees C and 1.5 V, and successfully runs over 170 h without any attenuation. The introduction of Bi exsolution not only promotes CoFe exsolution, provides additional oxygen vacancies, but also greatly boost the kinetics of CO2 2 adsorption/dissociation/activation. This work offers new insights into tailoring perovskite electrocatalysts for the CO2 2 electrolysis via dualexsolution strategy.