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

共 29 条

[11] IONIC-CONDUCTIVITY OF CEO2 WITH TRIVALENT DOPANTS OF DIFFERENT IONIC-RADII [J].

GERHARDTANDERSON, R ;

NOWICK, AS .

SOLID STATE IONICS, 1981, 5 (OCT) :547-550

[12]

Huang KQ, 1998, J AM CERAM SOC, V81, P357, DOI 10.1111/j.1151-2916.1998.tb02341.x

[13] Hydrothermal synthesis and properties of Ce1-xSmxO2-x/2 and Ce1-xCaxO2-x solid solutions [J].

Huang, W ;

Shuk, P ;

Greenblatt, M .

CHEMISTRY OF MATERIALS, 1997, 9 (10) :2240-2245

[14] Properties of sol-gel prepared Ce1-xSmxO2-x/2 solid electrolytes [J].

Huang, W ;

Shuk, P ;

Greenblatt, M .

SOLID STATE IONICS, 1997, 100 (1-2) :23-27

[15] Combustion synthesis of nanocrystalline ceria (CeO2) powders by a dry route [J].

Hwang, Chyi-Ching ;

Huang, Ting-Han ;

Tsai, Jih-Sheng ;

Lin, Cheng-Shiung ;

Peng, Cheng-Hsiung .

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 2006, 132 (03) :229-238

[16] FAST ANION TRANSPORT IN SOLIDS [J].

KILNER, JA .

SOLID STATE IONICS, 1983, 8 (03) :201-207

[17]

KLINER JA, 1982, SOLID STATE IONICS, V6, P253

[18]

KLUG P, 1954, DIFFRACTION PROCEDUR, P188

[19]

KUTO T, 1976, J ELECTROCHEM SOC, V123, P415

[20]

KUTO T, 1975, J ELECTROCHEM SOC, V122, P142

← 1 2 3 →