The A-cation deficient perovskite series La2−xCoTiO6−δ (0 ≤ x ≤ 0.20): new components for potential SOFC composite cathodes

摘要: La2−xCoTiO6−δ/Ce0.9Gd0.1O2−δ composites are presented as promising new cathodes for solid oxide fuel cells. The B-site ordering characteristic of double perovskites is present in the whole series. Additionally, increasing amounts La-vacancies give rise to alternating La-rich and □-rich (□ = vacancy) layers perpendicular c-axis. introduction La vacancies produces both oxidation Co2+ Co3+ oxygen inducing a change electrical electrochemical properties. best performances obtained low x due compromise between sufficiently high amount defects provide electronic ionic conductivities, but not so induce defect clustering. material with 0.05 exhibits Symmetrical cells made this Ce0.9Gd0.1O2−δ deposited on pellets electrolyte show polarization resistance 0.39 Ω cm2 at 1073 K.