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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 of La-vacancies give rise to ordering of alternating La-rich and □-rich (□ = vacancy) layers perpendicular to the c-axis. The introduction of La vacancies produces both oxidation of Co2+ to Co3+ and oxygen vacancies inducing a change of both electrical and electrochemical properties. The best electrochemical performances are obtained for low x due to a compromise between sufficiently high amount of defects to provide electronic and ionic conductivities, but not so high to induce defect clustering. The material with x = 0.05 exhibits the best performances of the series. Symmetrical cells made of composites of this material and Ce0.9Gd0.1O2−δ deposited on pellets of this electrolyte show a polarization resistance of 0.39 Ω cm2 at 1073 K.

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

The A-cation deficient perovskite series La_2−xCoTiO_6−δ (0 ≤ x ≤ 0.20): new components for potential SOFC composite cathodes