Electrical conductivity and structural stability of La-doped SrTiO₃ with A-site deficiency as anode materials for solid oxide fuel cells

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• 作者：Xue Li ; Hailei Zhao ; Xiong Zhou ; Nansheng Xu ; Zhixiang Xie ; Ning Chen
• 关键词：Solid oxide fuel cells ; A-site deficiency ; La-doped SrTiO₃ ; Electrical and ionic conductivities ; Thermal stability
• 刊名：International Journal of Hydrogen Energy
• 出版年：2010
• 出版时间：August 2010
• 年：2010
• 卷：35
• 期：15
• 页码：7913-7918
• 全文大小：1045 K

文摘

A-site-deficient (La_0.3Sr_0.7)_1−xTiO_3−δ materials were synthesized by conventional solid-state reaction. The A-site deficiency limit in (La_0.3Sr_0.7)_1−xTiO_3−δ was below 10 mol % in 5 % H₂/Ar at 1500 °C. A-site deficiency level promoted the sintering process of (La_0.3Sr_0.7)_1−xTiO_3−δ. The ionic conductivity increased but the electronic conductivity decreased with increasing A-site deficiency level. The ionic conductivity of (La_0.3Sr_0.7)_0.93TiO_3−δ sample was as high as 0.2–1.6 × 10⁻² S/cm in 500–950 °C and 1.0 × 10⁻² S/cm at 800 °C, over twice of La_0.3Sr_0.7TiO_3−δ. Its electrical conductivity was in the range of 83–299 S/cm in 50–950 °C and 145 S/cm at 800 °C. A-site deficiency improved the thermal stability of (La_0.3Sr_0.7)_1−xTiO_3−δ and ensured the material with a stable electrical performance in different atmospheres.