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

Authors
Cho, Pyeong-SeokLee, Sung BoCho, Yoon HoKim, Doh-YeonPark, Hyun-MinLee, Jong-Heun
Issue Date
1-9월-2008
Publisher
ELSEVIER
Keywords
gadolinia-doped (GDC); grain-boundary conduction; scavenging effect; solid oxide fuel cell; calcium oxide
Citation
JOURNAL OF POWER SOURCES, v.183, no.2, pp.518 - 523
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF POWER SOURCES
Volume
183
Number
2
Start Page
518
End Page
523
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/122730
DOI
10.1016/j.jpowsour.2008.05.041
ISSN
0378-7753
Abstract
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.
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