Journal
SOLID STATE IONICS
Volume 262, Issue -, Pages 378-381Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2013.12.005
Keywords
Surface reaction; (La,Sr)CoO3 (LSC); Cation nonstoichiometry; Cathode; Solid oxide fuel cells
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The effect of cation nonstoichiometry on the surface reactivity of mixed ionic and electronic conducting (La,Sr)CoO3 (LSC113)-based bi-layer thin film cathodes is investigated by ac impedance method as a function of thin film surface composition. The bi-layer thin film cathodes are fabricated by an RF-sputtering method. The results of X-ray diffraction and transmission electron microscopy observation prove that LSC thin films of A-site and B-site deficient composition crystallize in a perovskite structure, which is attained by retained supersaturated metastability from the fabrication process. Both A-site and B-site deficient LSC113 phases have surface reaction performance significantly higher than the cation-stoichiometric LSC113 phase, which is attributed to the increase of oxygen vacancy in charge-compensation for cation vacancy. The cation nonstoichiometry is one of high surface reaction models to improve solid oxide fuel cells' performance. (C) 2013 Elsevier B.V. All rights reserved.
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