Abstract
Accelerating sluggish kinetics of CO2 reduction reaction (CO2RR) is of great importance for efficiently converting CO2 into valuable chemical products in solid oxide electrolysis cells (SOECs). Here, a novel dual-exsolution strategy is proposed to enhance CO2 electrolysis properties of La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ (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 electrolysis at 800 °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 adsorption/dissociation/activation. This work offers new insights into tailoring perovskite electrocatalysts for the CO2 electrolysis via dual-exsolution strategy.
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