Efficient bifunctional electrocatalysts for solid oxide cells based on the structural evolution of perovskites with abundant defects and exsolved CoFe nanoparticles

Solid oxide cells (SOCs) including solid fuel (SOFCs) and electrolysis (SOECs) are advanced electrochemical energy storage conversion devices. However, the lack of highly active stable electrode materials impedes their practical applications. Herein, in-situ exsolved CoFe nanoparticles on perovskite matrixes with abundant defects developed as bifunctional electrocatalysts for SOCs from Sr2FeMo1-xCoxO6?? (x = 0, 0.15, 0.25, 0.45) precursor. Increasement Co doping promotes alloy exsolution formation more in remaining matrix under reducing atmosphere at high temperatures. Consequently, increasing dopant content, electrocatalytic activity towards CO2 hydrogen (H2) oxidation both significantly enhanced reduced Sr2FeMo1-xCoxO6??. The content x 0.45 also exhibits respectable coking resistance excellent long-term stability. performance may be owing to unique simultaneously formed nanoalloy-oxide heterostructure electron-ion mixed conductive defects.