Preparation and performance of Pr-doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ cathode for IT-SOFCs

被引：1
作者：
朱成军 [1 ]
衣翠珊 [1 ]
潮洛蒙 [1 ]
机构：
[1] Key Laboratory of Semiconductor Photovoltaic Technology of Inner Mongolia Autonomous Region,School of Physical Science and Technology,Inner Mongolia Univer-sity
来源：
Journal of Rare Earths | 2011年 / 29卷 / 11期
基金：
中国博士后科学基金;
关键词：
IT-SOFCs; cathode; thermal expansion; electrochemical properties; rare earths;
D O I：
暂无
中图分类号：
TM911.4 [燃料电池];
学科分类号：
0808 ;
摘要：
(Ba0.5Sr0.5)1-xPrxCo0.8Fe0.2O3-δ(BSPCFx;x=0.00-0.30) oxides were synthesized by a sol-gel thermolysis process using combination of PVA and urea,and were also investigated as cathode material for intermediate temperature solid oxide fuel cells(IT-SOFCs).X-ray diffraction(XRD) results showed that all the samples formed a single phase cubic pervoskite-type structure after being calcined at 950 oC for 5 h and the lattice constant decreased with the Pr content increasing.The electrical conductivity of Ba0.5Sr0.5Co0.8Fe0.2O3-δ(BSCF) was greatly enhanced by Pr-doping.The thermal expansion coefficient(TEC) of BSPCFx was increased with the content of Pr increasing,and all the thermal expansion curves had an inflection at about 250-400 oC due to the thermal-induced lattice oxygen loss and the reaction of Co and Fe ion.Ac impedance analysis indicated that BSPCFx possessed better electrochemical performance.The polarization resistance of the sample with x=0.2 was only ～0.948 Ω cm2 at 500 oC,significantly lower than that of BSCF(～2.488 Ω cm2).
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收藏
页码：1070 / 1074
页数：5
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