Dual-functional engineering of Fe nanoparticles and oxygen vacancies in Sr 1.9 Fe 1.5 Mo 0.5 O 6− δ perovskites for high-efficiency CO 2 /H 2 O co-electrolysis

A-site deficiency facilitates in situ exsolution of Fe nanoparticles and oxygen vacancy generation in Sr 1.9 Fe 1.5 Mo 0.5 O 6− δ perovskites, achieving co-electrolysis current density of −1.58 A cm −2 @ 1.5 V with extended durability about 80 h.