.
李治均1,宋希文1,周芬1,郜建全2,安胜利1
( 1.内蒙古科技大学材料与冶金学院,内蒙古包头014010; 2.东北大学材料与冶金学院,辽宁沈阳110004)
关键词: 掺杂; 电解质; 电学性能
中图分类号: TM911 文献标识码: A
摘要: 利用溶胶凝胶-低温燃烧法合成了( La0. 95 Sr0. 05)0. 2 Ce0. 8 O2 -δ的粉体.采用XRD 对其结构进行表征,结果表明,空气气氛下800 ℃煅烧5 h 制得的( La0. 95 Sr0. 05
)0. 2Ce0. 8O2 -δ粉体为单一的立方萤石结构.不同烧结温度制备的电解质的SEM 表明,在1
450
℃
即可制得致密的电解质.采用两端子交流阻抗谱法在400 ~
800
℃
空气气氛中测量了电解质的电性能,电解质在
600
℃
的电导率为0. 019 S /cm.阳极支撑的单电池在中温范围具有较高的功率密度,
650 ℃
时达1. 039 W/cm2 .
Synthesis and electrical properties of ( La0. 95 Sr0. 05)0. 2 Ce0. 8 O2 -δelectrolyte for intermediate temperature solid state oxide fuel cells
LI Zhi-jun ,SONG Xi-wen1,ZHOU Fen1,GAO Jian-quan2,AN Sheng-li
( 1. Materials and Metallurgy School , Inner Mongolia University of Science and Technology,Baotou 014010,China; 2. School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China)
Key words: doping electrolyte electrical property
Abstract: ( La0. 95 Sr0. 05)0.2Ce0. 8O2 -δ powders were synthesized by the combination of sol-gel process and low temperature self-propagating combustion method. The XRD patterns reveal that ( La0. 95 Sr0. 05)0. 2Ce0. 8O2 -δ powder has the cubic uorite structure after being sinteredat
800
℃
for 5 h in the air. SEM micrographs of the electrolytes fired at different temperatures indicate that the dense electrolytecan be obtained at 1
450
℃
. The electrical conductivity was measured using two-probe impedance spectroscopy. The conductivity of the sample fired at 1
450
℃
is 0. 019 S /cm at
600
℃
. The anode-supported cell exhibits a higher power density,which reaches 1. 039 W/cm2 at
650
℃
.