09.中温固体电解质( La0． 95 Sr0． 05)0． 2 Ce0． 8 O2 － δ的制备及电化学性能*

 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 ℃ ．