Characterization of Sr-doped LaCoO3-YSZ composites prepared by impregnation methods

被引:119
作者
Huang, YY [1 ]
Ahn, K [1 ]
Vohs, JM [1 ]
Gorte, RJ [1 ]
机构
[1] Univ Penn, Dept Chem & Biomol Engn, Philadelphia, PA 19104 USA
关键词
D O I
10.1149/1.1789371
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Porous yttria-stabilized zirconia (YSZ) was impregnated with aqueous solutions of the nitrate salts of Sr, La, and Co to obtain composites of La0.6Sr0.4CoO3-delta (LSCo) and YSZ. X-ray diffraction showed that the perovskite phase formed after heating to 973 K and conductivities as high as 7 S/cm were achieved at 973 K with only 30 wt % LSCo. Coefficient of thermal expansion (CTE) measurements of the composites with as much as 50 wt % LSCo indicated that the CTEs were much lower than the weighted average of the YSZ and LSCo. Electrochemical measurements using symmetric cells in air indicated that the area-specific resistance (ASR) of the composites could be as low as 0.03 Omega cm(2) at 973 K and 0.01 Omega cm(2) at 1073 K. These low ASR were verified in a cell with an LSCo-YSZ cathode and a Co-ceria-YSZ anode, which exhibited a total electrode polarization loss of 0.25 Omega cm(2) at 973 K and 0.1 fOmega cm(2) at 1073 K for operation in humidified H-2. However, changes in electrochemical performance with time showed that some electrode degradation occurred over a period of 250 h, even at 973 K. (C) 2004 The Electrochemical Society.
引用
收藏
页码:A1592 / A1597
页数:6
相关论文
共 35 条
[1]   Synthesis of highly porous yttria-stabilized zirconia by tape-casting methods [J].
Boaro, M ;
Vohs, JM ;
Gorte, RJ .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2003, 86 (03) :395-400
[2]   Cathodic reaction mechanism of dense La0.6Sr0.4CoO3 and La0.81Sr0.09MnO3 electrodes for solid oxide fuel cells [J].
Endo, A ;
Fukunaga, H ;
Wen, C ;
Yamada, K .
SOLID STATE IONICS, 2000, 135 (1-4) :353-358
[3]   Reactions between a zirconia-based electrolyte and LaCoO3-based electrode materials [J].
Figueiredo, FM ;
Labrincha, JA ;
Frade, JR ;
Marques, FMB .
SOLID STATE IONICS, 1997, 101 :343-349
[4]   Perovskite cathodes for solid oxide fuel cells based on ceria electrolytes [J].
Godickemeier, M ;
Sasaki, K ;
Gauckler, LJ ;
Riess, I .
SOLID STATE IONICS, 1996, 86-8 :691-701
[5]  
Gorte RJ, 2000, ADV MATER, V12, P1465, DOI 10.1002/1521-4095(200010)12:19<1465::AID-ADMA1465>3.0.CO
[6]  
2-9
[7]   Low-temperature fabrication of oxide composites for solid-oxide fuel cells [J].
He, HP ;
Huang, YY ;
Regal, J ;
Boaro, M ;
Vohs, JM ;
Gorte, RJ .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2004, 87 (03) :331-336
[8]   Modelling and DC-polarisation of a three dimensional electrode/electrolyte interface [J].
Herbstritt, D ;
Weber, A ;
Ivers-Tiffée, E .
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2001, 21 (10-11) :1813-1816
[9]   Oxygen reduction mechanism at porous La1-xSrxCoO3-d cathodes/La0.8Sr0.2Ga0.8Mg0.2O2.8 electrolyte interface for solid oxide fuel cells [J].
Horita, T ;
Yamaji, K ;
Sakai, N ;
Yokokawa, H ;
Weber, A ;
Ivers-Tiffée, E .
ELECTROCHIMICA ACTA, 2001, 46 (12) :1837-1845
[10]   Electrode reaction of La1-xSrxCoO3-d cathodes on La0.8Sr0.2Ga0.8Mg0.2O3-y electrolyte in solid oxide fuel cells [J].
Horita, T ;
Yamaji, K ;
Sakai, N ;
Yokokawa, H ;
Weber, A ;
Ivers-Tiffée, E .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2001, 148 (05) :A456-A462