Electrical conduction behavior of La,Co co-doped SrTiO3 perovskite as anode material for solid oxide fuel cells |
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Authors: | Xue Li Hailei Zhao Nansheng Xu Xiong Zhou Cuijuan Zhang Ning Chen |
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Affiliation: | 1. Department of Inorganic Nonmetallic Materials, University of Science and Technology Beijing, Beijing 100083, China;2. Beijing Key Lab of New Energy Materials and Technology, Beijing 100083, China |
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Abstract: | The effects of La- and Co-doping into SrTiO3 perovskite oxides on their phase structure, electrical conductivity, ionic conductivity and oxygen vacancy concentration have been investigated. The solid solution limits of La in LaxSr1 − xTiO3 − δ and Co in La0.3Sr0.7CoyTi1 − yO3 − δ are about 40 mol% and 7 mol%, respectively, at 1500 °C. The incorporation of La decreases the band gap and thus increases the electrical conductivity of SrTiO3 remarkably. La0.3Sr0.7TiO3 − δ shows an electrical conductivity of 247 S/cm at 700 °C. Co-doping into La0.3Sr0.7TiO3 − δ increases the oxygen vacancy concentration and decreases the migration energy for oxygen ions, leading to a significant increase in ionic conductivity but at the expense of some electrical conductivity. The electrical and ionic conductivities of La0.3Sr0.7Co0.07Ti0.93O3 − δ are 63 S/cm and 6 × 10−3 S/cm, respectively, at 700 °C. Both La0.3Sr0.7TiO3 − δ and La0.3Sr0.7Co0.07Ti0.93O3 − δ show relatively stable electrical conductivities under oxygen partial pressure of 10−14–10−19 atm at 800 °C. These properties make La0.3Sr0.7Co0.07Ti0.93O3 − δ a promising anode candidate for solid oxide fuel cells. |
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Keywords: | Solid oxide fuel cell Anode SrTiO3 Electronic and ionic conductivity Co-doping |
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