一种用于SOFC的有前途电解质:Sc~(3+)和Bi~(3+)共掺氧化锆

稀有金属材料与工程, 2009, 38(z2): 719-721.

一种用于SOFC的有前途电解质:Sc~(3+)和Bi~(3+)共掺氧化锆

李彬 ^1, , 潘伟 ^2, , 魏玺 ^3, , 刘艳档 ^4, , 陈争辉 ^5, , 覃叶霞 ^6, , 石随林 ^7,

1.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

2.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

3.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

4.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

5.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

6.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

7.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

基金项目: Toyota Cor

关键词： Sc掺杂氧化锆 , 氧化铋 , 固体氧化物电解质

Promising Electrolyte for SOFC: Zirconia Codoped with Sc~(3+) and Bi~(3+)

Li Bin ^1, , Pan Wei ^2, , Wei Xi ^3, , Liu Yanyi ^4, , Chen Zhenghui ^5, , Qin Yexia ^6, , Shi Suilin ^7,

1.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

2.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

3.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

4.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

5.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

6.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

7.清华大学,新型陶瓷与精细工艺国家重点实验室,北京,100084

Keywords： Sc-doped zirconia , bismuth oxide , solid oxide electrolyte

采用pechini方法合成了Sc、Bi共掺的氧化锆粉体,并且在1050～1500 ℃下进行烧结.通过XRD、拉曼光谱和交流阻抗等测试研究了物相组成和电导率.研究发现,Bi_2O_3的加入在降温过程,部分抑制了t'→t的相变,而且作为助烧剂提高了样品密度.当烧结温度为1400 ℃时,样品电导率最高 (大约10~(-2) S/cm, 500 ℃),这可能是由于在此温度下m相的消失和亚稳相t'的抑制分解所致.

Sc-stabilized zirconia doped with 2 mol% Bi_2O_3 (Bi-8ScSZ) was synthesized by Pechini method, and sintered at 1050～1500 ℃. The phases and electrical conductivity were investigated using XRD, visible Raman spectroscopy, and AC impedance spectroscopy. The addition of Bi_2O_3 partly suppressed the phase transitions (t'→t) in cooling process from elevated sintering temperatures, and improved the densities of the samples as a sintering aid. When the sintering temperature was 1400℃, the Bi-8ScSZ exhibited a high total electrical conductivity (about 10~(-2) S/cm, at 500 ℃), which may be due to the elimination of m-phase and the suppression of the decomposition of a meta-stable phase t'

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