Synthesis and electrical properties of Ce0.8Sm0.2O1.9 ceramics for IT-SOFC electrolytes by urea-combustion technique

被引：75

作者：

Chen, Min ^{[1
]}

Kim, Bok Hee ^{[1
]}

Xu, Qing ^{[2
]}

Ahn, Byeong Kuk ^{[1
]}

Kang, Woo Jin ^{[1
]}

Huang, Duan Ping ^{[2
]}

机构：

[1] Chonbuk Natl Univ, Hydrogen & Fuel Cell Res Ctr, Dept Hydrogen & Fuel Cells Engn, Jeonju 561756, Jeonbuk, South Korea

[2] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2009年 / 35卷 / 04期

关键词：

Powders: chemical preparation; Grain boundaries; Ionic conductivity; Fuel cells; OXIDE FUEL-CELLS; DOPED CERIA; IONIC-CONDUCTIVITY; SOLID-SOLUTIONS; AC-IMPEDANCE; POWDERS; CEO2; COPRECIPITATION; CE1-XSMXO2-X/2;

D O I：

10.1016/j.ceramint.2008.06.014

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Fine Ce0.8Sm0.2O1.9 (SDC) powders with a fluorite cubic phase were prepared using a urea-combustion technique. The sinterability and microstructural evolution of the resulting ceramics were investigated. The results indicate that the ceramics sintered above 1350 degrees C display relative densities of about 98.5% along with significant grain growth. With respect to their electrical conduction properties, the specimens sintered above 1350 degrees C exhibit an excellent total ionic conductivity of 0.082 S cm(-1) at 800 degrees C in air. However, when measured in an N-2 + 33.3%H-2 atmosphere, a pronounced Warburg feature appears in the impedance plots of the SDC ceramics, together with a significant increase of the total conductivity at measuring temperaures above 550 degrees C, due to the introduction of a mixed Ce4+/Ce3+ valence state and the generation of the electronic conduction in the reducing atmosphere. (C) 2008 Elsevier L.td and Techna Group S.r.l. All rights reserved.

引用

页码：1335 / 1343

页数：9

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