The electrochemical performance of LSM/zirconia-yttria interface as a function of a-site non-stoichiometry and cathodic current treatment

被引：173

作者：

Jiang, SP ^{[1
]}

Love, JG ^{[1
]}

Zhang, JP ^{[1
]}

Hoang, M ^{[1
]}

Ramprakash, Y ^{[1
]}

Hughes, AE ^{[1
]}

Badwal, SPS ^{[1
]}

机构：

[1] CSIRO, Mfg Sci & Technol, Clayton, Vic 3169, Australia

来源：

SOLID STATE IONICS | 1999年 / 121卷 / 1-4期

关键词：

LSM cathodes; fuel cells; impedance spectroscopy; cathodic current treatment; zirconia; performance;

D O I：

10.1016/S0167-2738(98)00295-1

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：

The adhesion and the electrochemical performance of Sr doped LaMnO3 (LSM) electrode with zirconia-yttria electrolyte has been investigated as a function of the A-site non-stoichiometry. In addition the effect of cathodic current treatment on the electrode resistance and the mechanism of oxygen reduction have been carefully studied. The LSM/electrolyte interface region was examined by SEM/EDS and XRD. The adhesion of porous LSM electrode coating is critically dependent on free La activity near the interface region and the formation of a pyrochlore phase, La2Zr2O7. A slight A-site deficiency (similar to 0.1) is effective in inhibiting the formation of such a pyrochlore phase and it greatly improves the adhesion to the electrolyte. The cathodic current treatment significantly enhances the electrochemical activity of LSM and also modifies the reaction mechanism for oxygen reduction. This effect appears to be associated with the surface composition of LSM, near the electrode/electrolyte interface, which changes with prevailing oxygen partial pressure near the three-phase boundary region under the condition of current flow. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：1 / 10

页数：10

共 30 条

[11] HUEBNER W, 1997, P 5 INT S SOFC EL SO, V9740, P411
[12] KANEKO H, 1991, P 2 INT S SOL OX FUE, P673
[13] LAMNO3 AIR CATHODES CONTAINING ZRO2 ELECTROLYTE FOR HIGH-TEMPERATURE SOLID OXIDE FUEL-CELLS
KENJO, T
NISHIYA, M
[J]. SOLID STATE IONICS, 1992, 57 (3-4) : 295 - 302
[14] KITAGAWA K, 1994, J CERAM SOC JPN, V102, P510
[15] LOVE JG, UNPUB
[16] MACKOR A, 1991, P 2 INT S SOL OX FUE, P463
[17] CERAMIC FUEL-CELLS
MINH, NQ
[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1993, 76 (03) : 563 - 588
[18] MITTERDORFER A, 1996, P 2 EUR SOL OX FUEL, P373
[19] OXYGEN SEMIPERMEABILITY OF MIXED-CONDUCTIVE OXIDE THICK-FILM PREPARED BY SLIP CASTING
MIURA, N
OKAMOTO, Y
TAMAKI, J
MORINAGA, K
YAMAZOE, N
[J]. SOLID STATE IONICS, 1995, 79 : 195 - 200
[20] MECHANISM OF REACTION BETWEEN LANTHANUM MANGANITE AND YTTRIA-STABILIZED ZIRCONIA
TAIMATSU, H
WADA, K
KANEKO, H
YAMAMURA, H
[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1992, 75 (02) : 401 - 405

← 1 2 3 →