A solid oxide fuel cell based on Sr- and Mg-doped LaGaO3 electrolyte:: the role of a rare-earth oxide buffer

被引:191
作者
Huang, KQ [1 ]
Goodenough, JB [1 ]
机构
[1] Univ Texas, Texas Mat Inst, Austin, TX 78712 USA
关键词
solid electrolyte; lanthanum gallate; fuel cell; solid oxide; cathode; anode; buffer layer;
D O I
10.1016/S0925-8388(00)00626-5
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
In this paper we review a systematic study on the properties of the superior oxide-ion conductor Sr- and Mg-doped LaGaO3 (LSGM) and its performance in a single fuel cell. The conductivity of the oxygen-deficient perovskite phase was shown to be purely ionic over a wide range of oxygen partial pressures 10(-22)less than or equal to Po(2)less than or equal to 1 atm. The highest values of the oxide-ion conductivity, sigma(o)=0.17, 0.08 and 0.03 S/cm, were found for La0.8Sr0.2Ga0.83Mg0.17O2.815 at 800, 700 and 600 degrees C, respectively; they remained stable over a weeklong test. The reactivity of Ni and LSGM suggested use of a thin interlayer at the anode-electrolyte interface to prevent formation of lanthanum nickelates; Ce0.8Sm0.2O1.9 (SDC) was selected for the interlayer. The peak power density of the interlayered cell is 100 mW/cm(2) higher than that of the standard cell without the interlayer. This improvement is due to a significant reduction of the anode overpotential; the overpotential of the cathode La0.6Sr0.4CoO3-delta (LSCo) remained unchanged. Comparison of the peak power density in this study and with that of a previous study, also with a 500-mu m-thick electrolyte, indicates a factor of two improvement, i.e, from 270 mW/cm(2) to 550 mW/cm2 at 800 degrees C. The excellent cell performance showed that an LSGM-based SOFC operating at temperatures T(op)less than or equal to 800 degrees C is a realistic goal. (C) 2000 Published by Elsevier Science S.A. All rights reserved.
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收藏
页码:454 / 464
页数:11
相关论文
共 17 条
[1]   Fuel cells with doped lanthanum gallate electrolyte [J].
Feng, M ;
Goodenough, JB ;
Huang, KQ ;
Milliken, C .
JOURNAL OF POWER SOURCES, 1996, 63 (01) :47-51
[2]  
FENG M, 1994, EUR J SOL STATE INOR, V31, P663
[3]   FAST IONIC-CONDUCTION IN SOLIDS [J].
GOODENOUGH, JB .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1984, 393 (1805) :215-234
[4]   OXIDE-ION CONDUCTION IN BA2IN2O5 AND BA3IN 2CEO8, BA3IN2HFO8, OR BA3IN2ZRO8 [J].
GOODENOUGH, JB ;
RUIZDIAZ, JE ;
ZHEN, YS .
SOLID STATE IONICS, 1990, 44 (1-2) :21-31
[5]   Sr- and Ni-doped LaCaO3 and LaFeO3 perovskites -: New cathode materials for solid-oxide fuel cells [J].
Huang, K ;
Lee, HY ;
Goodenough, JB .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1998, 145 (09) :3220-3227
[6]  
HUANG K, 1999, IN PRESS 195 EL SOC
[7]  
HUANG K, IN PRESS MEMORIAL IS
[8]   Bi2O3-Y2O3-CeO2 solid solution oxide-ion electrolyte [J].
Huang, KQ ;
Feng, M ;
Goodenough, JB .
SOLID STATE IONICS, 1996, 89 (1-2) :17-24
[9]   Characterization of Sr-doped LaMnO3 and LaCoO3 as cathode materials for a doped LaGaO3 ceramic fuel cell [J].
Huang, KQ ;
Feng, M ;
Goodenough, JB ;
Schmerling, M .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (11) :3630-3636
[10]   Electrode performance test on single ceramic fuel cells using as electrolyte Sr- and Mg-doped LaGaO3 [J].
Huang, KQ ;
Feng, M ;
Goodenough, JB ;
Milliken, C .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1997, 144 (10) :3620-3624