Effect of CaO concentration on enhancement of grain-boundary conduction in gadolinia-doped ceria

被引：71

作者：

Cho, Pyeong-Seok ^{[1
]}

Lee, Sung Bo ^{[2
]}

Cho, Yoon Ho ^{[1
]}

Kim, Doh-Yeon ^{[2
]}

Park, Hyun-Min ^{[3
]}

Lee, Jong-Heun ^{[1
]}

机构：

[1] Korea Univ, Dept Mat Sci & Engn, Seoul 136713, South Korea

[2] Seoul Natl Univ, Sch Mat Sci & Engn, Seoul 151744, South Korea

[3] Korea Res Inst Stand & Sci, New Mat Evaluat Ctr, Taejon 305600, South Korea

来源：

JOURNAL OF POWER SOURCES | 2008年 / 183卷 / 02期

关键词：

gadolinia-doped (GDC); grain-boundary conduction; scavenging effect; solid oxide fuel cell; calcium oxide;

D O I：

10.1016/j.jpowsour.2008.05.041

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This study examines the effect of calcium oxide (CaO) addition to Ce0.9Gd0.1 O-1.95 (gadolinia-doped ceria, CDC) containing 500 ppm SiO2 on grain-interior and grain-bounclary conduction. The CDC can be used as a solid electrolyte for intermediate and low-temperature solid oxide fuel cells. Doping with >= 2 mol% CaO results in a decrease in apparent grain-boundary resistivity at 300 degrees C from 746.7 k Omega cm to 2.8-3.5 k Omega cm. The total resistivity exhibits a minimum at 2 mol% CaO. Further increase in CaO concentration to 10 mol% results in an increase in grain-interior resistivity from 3.1 to 40 k Omega cm. Although most of the CaO is incorporated into the GDC lattice, a small amount of CaO scavenges the intergranular siliceous phase, which leads to a significant increase in grain-bounclary conduction. The increase in grain-interior resistivity at high CaO concentration is attributed to defect association between Vo center dot center dot and Ca-ce. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：518 / 523

页数：6

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