Preparation and properties of Y3+ and Ca2+ co-doped ceria electrolyte materials for ITSOFC

被引：17
作者：
Hongmei, Xu [1 ]
Hongge, Yan [2 ]
Zhenhua, Chen [2 ]
机构：
[1] Hunan Univ Sci & Technol, Inst Mat Surface Engn, Adv Mat Synth & Appl Technol Lab, Xiangtan 411201, Hunan, Peoples R China
[2] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China
来源：
SOLID STATE SCIENCES | 2008年 / 10卷 / 09期
关键词：
solid electrolyte; co-doping; ceria; conductivity; low-temperature combustion synthesis;
D O I：
10.1016/j.solidstatesciences.2007.12.024
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Y3+ and Ca2+ co-doped Ce0.8+xY0.2-2xCaxO1.9 (x = 0-0.1) electrolyte powders for intermediate temperature solid oxide fuel cells were prepared by a low-temperature combustion synthesis method. The burnt powders had good sinterability and the relative densities of these sintered bodies were over 95% at 1350 degrees C for 4 h. The electrical property of Ce0.8+xY0.2-2xCaxO1.9 was studied by the impedance spectra analysis in the temperature range of 300-700 degrees C. The results displayed that the conductivity of the co-doped electrolytes was higher and the activation energy was lower compared with the singly doped ceria with the same oxygen vacancy concentration. The grain and the grain boundary conductivity of Ce0.8+xY0.2-2xCaxO1.9 (x = 0-0.1) electrolytes increased firstly and then decreased with increasing the Ca2+ concentration. The influence codoping on the electrical properties of the grain boundary was more apparent than that on the electrical properties of the grain. The influence mechanism of co-doping on the electrical properties of the grain and grain boundary was analyzed. (C) 2007 Elsevier Masson SAS. All rights reserved.
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收藏
页码：1179 / 1184
页数：6
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