Effects of mixed conduction on the open-circuit voltage of intermediate-temperature SOFCs based on Sm-doped ceria electrolytes

被引:120
作者
Matsui, T
Kosaka, T
Inaba, M
Mineshige, A
Ogumi, Z
机构
[1] Kyoto Univ, Grad Sch Engn, Dept Energy & Hydrocarbon Chem, Nishikyo Ku, Kyoto 6158510, Japan
[2] Doshisha Univ, Fac Engn, Dept Mol Sci & Technol, Kyoto 6100321, Japan
[3] Univ Hyogo, Dept Mat Sci & Chem, Himeji, Hyogo 6712201, Japan
关键词
doped ceria; solid oxide fuel cells; mixed conductor;
D O I
10.1016/j.ssi.2004.10.010
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
The effects of mixed conduction on the open-circuit voltage of intermediate-temperature solid oxide fuel cells (SOFCs) based on SDC20 were studied in the temperature range of 723-973 K. Though the measured OCVs of a test cell using high activity electrodes agreed well with theoretical values calculated using the conductivity data at 973 K, they deviated from the theoretical ones at lower temperatures. The OCV was dependent on electrode activity and electrolyte thickness, and it was concluded that overpotential at the electrode/electrolyte interfaces affected the OCV because of internal short circuit. The ionic transference number of SDC 20 that is free from the effect of overpotential was obtained using a method derived by Liu et al. SDC20 exhibited high ionic transference number with suppressed electronic conduction at low temperatures with highly humidified fuel. These results indicate that the electronic conduction of SDC20 can be suppressed at intermediate temperatures with high humidification of fuel, which agreed well with the results from the theoretical consideration of the conductivity data. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:663 / 668
页数:6
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