论文摘要
Solid oxide fuel cell is a promising energy conversion system which converts chemical energy into electrical energy directly. Electrolyte is the key component and determines the working temperature. In this paper,ceria and scandia co-doped zirconia electrolytes sintered from 1300 to 1550 ℃ were chosen as research objects. Scanning electron microscopy, X-ray diffraction and transmission electron microscopy were performed to characterize the ceramic samples. The effects of grain size and grain boundary element segregation on the electrical conductivity were focused. Electrochemical impedance spectroscopy was used to calculate the bulk, grain boundary and specific grain boundary conductivity. Results show that the bulk and grain boundary ionic conductivity increases with the increasing grain size.However, the specific grain boundary conductivity decreases with the increasing grain size. This is explained by the fact that Sc3+ is segregated at the grain boundary, which leads to higher oxygen vacancy concentration when sintered at lower temperature.
论文目录
文章来源
类型: 期刊论文
作者: Qiannan Xue,Xiaowei Huang,Jianxing Zhang,He Zhang,Zongyu Feng
来源: Journal of Rare Earths 2019年06期
年度: 2019
分类: 工程科技Ⅰ辑,工程科技Ⅱ辑
专业: 化学,无机化工,电力工业
单位: National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals,Grirem Advanced Materials Co.,Ltd.
基金: Project supported by National Natural Science Foundation of China(51504034),Beijing Nova Program(Z181100006218030)
分类号: O646;TM911.4
页码: 645-651
总页数: 7
文件大小: 1268K
下载量: 16
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