Electrical properties of yttrium doped strontium titanate with A-site deficiency as potential anode materials for solid oxide fuel cells

Yttrium doped strontium titanate with A-site deficiency ((Y(0.08)Sr(0.92))(1-x)TiO(3-delta)) was synthesized by conventional solid state reaction. The deficiency limit of A-site in (Y(0.08)Sr(0.92))(1-x)TiO(3-delta) is below 6 mol% in Ar/H(2) (5%)at 1500 degrees C. The sinterability of (Y(0.08)Sr(0.92))(1-x)TiO(3-delta) samples decreases slightly with increasing A-site deficiency level (x). The ionic conductivity of (Y(0.08)Sr(0.92))(1-x)TiO(3-delta) samples increases while the electronic conductivity decreases with increasing A-site deficient amount The defect chemistry analysis indicates that the introduction of A-site deficiency results in not only the increase of oxygen vacancy concentration but also the decrease of Ti(3+)-ion concentration. The latter plays the main role in the electrical conduction. (Y(0.08)Sr(0.92))(1-x)TiO(3-delta)shows good thermal-cyclic performance in electrical conductivity and has an excellent chemical compatibility with YSZ electrolyte below 1500 degrees C (C) 2008 Elsevier B.V. All rights reserved.