Journal
JOURNAL OF POWER SOURCES
Volume 185, Issue 1, Pages 26-31Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2008.07.015
Keywords
Solid oxide fuel cell; Anode materials; Yttrium-doped strontium titanate; Nonstoichiometry; Electronic and ionic conductivities
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Yttrium-doped strontium titanate with B-site deficiency (Y0.08Sr0.92Ti1-xO3-delta) is synthesized via conventional solid-state reaction. The effect of B-site deficiency on the lattice parameter, sinterability, microstructure and electrical properties of Y0.08Sr0.92TiO3-delta is investigated. The charge compensation mechanism for B-site deficiency is proposed. The limit of B-site deficiency in Y0.08Sr0.92Ti1-xO3-delta is below 5 mol % in Ar with 5% H-2 at 1500 degrees C. The sinterability of Y0.08Sr0.92TiO3-delta decreases slightly with increasing deficiency level (x). Compared with Y0.08Sr0.92TiO3-delta, the electrical conductivity of Y0.08Sr0.92Ti1-xO3-delta samples decreases while the ionic conductivity increases with increasing B-site deficient amount. It is assumed that the deficiency of Ti in Y0.08Sr0.92Ti1-xO3-delta is charge compensated by the increase of oxygen vacancy concentration and the decrease of Ti3+ concentration. Y0.08Sr0.92Ti1-xO3-delta shows a relatively stable electrical conductivity at different oxygen partial pressures and displays an excellent chemical compatibility with YSZ electrolyte below 1200 degrees C. (c) 2008 Elsevier B.V. All rights reserved.
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