Perovskite Sr0.9Fe0.9Zr0.1O3-delta: Redox-stable Structure, Oxygen Vacancy, Electrical Properties and Steam Electrolysis Performance

Many researchers have studied on perovskite oxide for its unique structure. Perovskite oxides, ABO(3-delta), with different A and B metals have shown wide applications in many fields, in particular solid oxide electrolysers. SrFeO3-delta, typical perovskite oxides, in which iron is the mixed-valence cation with the capacity to change the chemical valence, have a wide range of oxygen nonstoichiometry. In this study, Sr0.9Fe0.9Zr0.1O3-delta (SFZO) is synthesized and then treated in 5% H-2/Ar and air at high temperature, exhibiting excellent redox stability. Redox-stable structure, oxygen vacancy and electrical properties of SFZO are investigated. Steam electrolysis is then performed with SFZO cathode under 5% H2O/5% H-2/Ar and 5% H2O/Ar atmospheres, respectively. The present results indicate that the SFZO is a novel promising cathode material for solid oxide steam electrolyser.