Characterization of Nd1-xSrxCoO3-δ (0≤x≤0.5) cathode materials for intermediate temperature SOFCs

被引:59
作者
Lee, KT [1 ]
Manthiram, A [1 ]
机构
[1] Univ Texas, Mat Sci & Engn Program, Austin, TX 78712 USA
关键词
D O I
10.1149/1.1828243
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The crystal chemistry, thermal expansion behavior, electrical conductivity, chemical compatibility, and electrochemical performance in intermediate temperature solid oxide fuel cells (SOFCs) of Nd1-xSrxCoO3-delta (0 less than or equal to x less than or equal to 0.5) perovskite oxides have been investigated. The samples crystallize in an orthorhombic structure, and the lattice volume increases with increasing Sr content, x. The thermal expansion coefficient decreases with x, reaches a minimum at x = 0.3, and then increases. The electrical conductivity increases with x, and the system exhibits a semiconductor-to-metal transition at around x = 0.3. The electrocatalytic activity and power density increase with increasing x, reaches a maximum around x = 0.4, and then decreases due to an interfacial reaction of the x = 0.5 sample with the electrolyte. The x = 0.4 sample shows a maximum power density value of 0.24 W/cm(2) at 800degreesC in single cells fabricated with the La0.8Sr0.2Ga0.8Mg0.2O2.8 electrolyte and Ni-Ce0.9Gd0.1O1.95 cermet anode. (C) 2004 The Electrochemical Society.
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收藏
页码:A197 / A204
页数:8
相关论文
共 29 条
[1]   Mechanism and kinetics of oxygen reduction on porous La1-xSrxCoO3-δ electrodes [J].
Adler, SB .
SOLID STATE IONICS, 1998, 111 (1-2) :125-134
[2]   POLARONS IN CRYSTALLINE AND NON-CRYSTALLINE MATERIALS [J].
AUSTIN, IG ;
MOTT, NF .
ADVANCES IN PHYSICS, 1969, 18 (71) :41-+
[3]  
Burdett J.K., 1995, Chemical Bonding in Solids, P167
[4]   Bulk and lattice thermal expansion in Ce1-xSrxO2-x(0.0≤x≤0.10) [J].
Chavan, SV ;
Patwe, SJ ;
Tyagi, AK .
JOURNAL OF ALLOYS AND COMPOUNDS, 2003, 360 (1-2) :189-192
[5]   GLYCINE NITRATE COMBUSTION SYNTHESIS OF OXIDE CERAMIC POWDERS [J].
CHICK, LA ;
PEDERSON, LR ;
MAUPIN, GD ;
BATES, JL ;
THOMAS, LE ;
EXARHOS, GJ .
MATERIALS LETTERS, 1990, 10 (1-2) :6-12
[6]   Oxygen transport in La1-xSrxMn1-yCoyO3±δ perovskites -: Part I.: Oxygen tracer diffusion [J].
De Souza, RA ;
Kilner, JA .
SOLID STATE IONICS, 1998, 106 (3-4) :175-187
[7]   THERMAL EXPANSION OF SOLIDS AT HIGH TEMPERATURES [J].
EASTABROOK, JN .
PHILOSOPHICAL MAGAZINE, 1957, 2 (24) :1421-1426
[8]   Thermal expansion of Sr- and Mg-doped LaGaO3 [J].
Hayashi, H ;
Suzuki, M ;
Inaba, H .
SOLID STATE IONICS, 2000, 128 (1-4) :131-139
[9]   Active sites imaging for oxygen reduction at the La0.9Sr0.1MnO3-x/yttria-stabilized zirconia interface by secondary-ion mass spectrometry [J].
Horita, T ;
Yamaji, K ;
Ishikawa, M ;
Sakai, N ;
Yokokawa, H ;
Kawada, T ;
Kato, T .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1998, 145 (09) :3196-3202
[10]   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