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

Alejandro Gomez-Perez, M. Teresa Azcondo, Mercedes Yuste, Juan Carlos Perez-Flores, Nikolaos Bonanos, Florence Porcher, Alvaro Munoz-Noval, Markus Hoelzel, Flaviano García-Alvarado, Ulises Amador

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Abstract

La2-xCoTiO6-delta/Ce0.9Gd0.1O2-delta 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 square-rich (square = 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-delta deposited on pellets of this electrolyte show a polarization resistance of 0.39 Omega cm(2) at 1073 K.
Original languageEnglish
JournalJournal of Materials Chemistry A
Volume4
Issue number9
Pages (from-to)3386-3397
Number of pages12
ISSN2050-7488
DOIs
Publication statusPublished - 2016

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