Electrical properties of yttrium doped strontium titanate with A-site deficiency as potential anode materials for solid oxide fuel cells |
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| Authors: | Hailei Zhao Feng Gao Xue Li Cuijuan Zhang Yueqing Zhao |
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| Institution: | 1. Department of Inorganic Nonmetallic Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Chinese Academy of Agricultural Mechanization Sciences, China;3. Beijing Key Lab of New Energy Materials and Technology, Beijing 100083, China |
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| Abstract: | Yttrium doped strontium titanate with A-site deficiency ((Y0.08Sr0.92)1 ? xTiO3 ? δ) was synthesized by conventional solid state reaction. The deficiency limit of A-site in (Y0.08Sr0.92)1 ? xTiO3 ? δ is below 6 mol% in Ar/H2 (5%) at 1500 °C. The sinterability of (Y0.08Sr0.92)1 ? xTiO3 ? δ samples decreases slightly with increasing A-site deficiency level (x). The ionic conductivity of (Y0.08Sr0.92)1 ? xTiO3 ? δ 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 Ti3+-ion concentration. The latter plays the main role in the electrical conduction. (Y0.08Sr0.92)1 ? xTiO3 ? δ shows good thermal-cyclic performance in electrical conductivity and has an excellent chemical compatibility with YSZ electrolyte below 1500 °C. |
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