Identification of O2 reduction processes at yttria stabilized zirconia|doped lanthanum manganite interface

被引:112
作者
Chen, XJ [1 ]
Khor, KA [1 ]
Chan, SH [1 ]
机构
[1] Nanyang Technol Univ, Fuel Cell Strateg Res Program, Sch Mech & Prod Engn, Singapore 639798, Singapore
关键词
powders-solid state reaction; impedance; perovskites; fuel cells;
D O I
10.1016/S0378-7753(03)00436-1
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
Oxygen reduction processes at a yttria stabilized zirconia\doped lanthanum manganite (LSM\YSZ) interface are investigated by ac impedance spectroscopy. Three semi-arcs are clearly observed at an oxygen partial pressure (p(O2)) of 0.001 atm. The constant-phase element of frequency arc and the p(O2)-dependence of 1/R (R: resistance) are correlated to interpret the reaction processes associated with the frequency arcs. It is found that at least five elementary steps are involved in oxygen reduction at the LSM\YSZ interface. Three of these steps are identified as the rate-determining steps, namely: (i) gas diffusion through the porous LSM electrode from the bulk to the reaction sites; (ii) surface diffusion of oxygen intermediate species along the LSM surface; (iii) incorporation of oxygen ions from the three phase boundary into the YSZ electrolyte lattice. The p(O2)-dependent exchange current density of the rate-determining step predicted by model is consistent with the experimental data, which further confirms the validity of the proposed oxygen reduction processes at the LSM\YSZ interface. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:17 / 25
页数:9
相关论文
共 25 条
[1]   OXYGEN REDUCTION AT LA0.5SR0.5MNO3 THIN-FILM YTTRIA-STABILIZED ZIRCONIA INTERFACE STUDIED BY IMPEDANCE SPECTROSCOPY [J].
GHARBAGE, B ;
PAGNIER, T ;
HAMMOU, A .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1994, 141 (08) :2118-2121
[2]   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
[3]   Deposition of chromium species at Sr-doped LaMnO3 electrodes in solid oxide fuel cells -: II.: Effect on O2 reduction reaction [J].
Jiang, SP ;
Zhang, JP ;
Foger, K .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2000, 147 (09) :3195-3205
[4]   Origin of the initial polarization behavior of Sr-doped LaMnO3 for O2 reduction in solid oxide fuel cells [J].
Jiang, SP ;
Love, JG .
SOLID STATE IONICS, 2001, 138 (3-4) :183-190
[5]   Observation of structural change induced by cathodic polarization on (La,Sr)MnO3 electrodes of solid oxide fuel cells [J].
Jiang, SP ;
Love, JG .
SOLID STATE IONICS, 2003, 158 (1-2) :45-53
[6]   The electrochemical performance of LSM/zirconia-yttria interface as a function of a-site non-stoichiometry and cathodic current treatment [J].
Jiang, SP ;
Love, JG ;
Zhang, JP ;
Hoang, M ;
Ramprakash, Y ;
Hughes, AE ;
Badwal, SPS .
SOLID STATE IONICS, 1999, 121 (1-4) :1-10
[7]   A comparative investigation of chromium deposition at air electrodes of solid oxide fuel cells [J].
Jiang, SP ;
Zhang, JP ;
Zheng, XG .
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2002, 22 (03) :361-373
[8]   Electrochemical reduction of oxygen on a strontium doped lanthanum manganite electrode [J].
Jiang, Y ;
Wang, SZ ;
Zhang, YH ;
Yan, JW ;
Li, WZ .
SOLID STATE IONICS, 1998, 110 (1-2) :111-119
[9]   Kinetic study of the formation of oxygen vacancy on lanthanum manganite electrodes [J].
Jiang, Y ;
Wang, SZ ;
Zhang, YH ;
Yan, JW ;
Li, WZ .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1998, 145 (02) :373-378
[10]   Characterisation of composite SOFC cathodes using electrochemical impedance spectroscopy [J].
Jorgensen, MJ ;
Primdahl, S ;
Morgensen, M .
ELECTROCHIMICA ACTA, 1999, 44 (24) :4195-4201