LSM-YSZ Reactions in Different Atmospheres

被引：50

作者：

Chen, M. ^{[1
]}

Liu, Y. -L. ^{[1
]}

Hagen, A. ^{[1
]}

Hendriksen, P. V. ^{[1
]}

Poulsen, F. W. ^{[1
]}

机构：

[1] Tech Univ Denmark, Riso Natl Lab Sustainable Energy, Fuel Cells & Solid State Chem Div, DK-4000 Roskilde, Denmark

来源：

FUEL CELLS | 2009年 / 9卷 / 06期

关键词：

Cathode-Electrolyte Interface; Degradation; Perovskite; Solid Oxide Fuel Cell (SOFC); Zirconate; Zirconia; YTTRIA-STABILIZED ZIRCONIA; PHASE-EQUILIBRIA; O SYSTEM; PART I; ZRO2; TRANSFORMATION; DEGRADATION; MANGANITE; LANTHANA; OXIDE;

D O I：

10.1002/fuce.200800129

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The influences of the oxygen partial pressure and the LSM/YSZ ratio on the LSM-YSZ interface reactions at 1,000 degrees C were investigated. Both pellets and diffusion couples were employed in the study. The equilibrium thermodynamics of the LSM-YSZ reactions was clarified based on the pellet study-powder reaction. LSM reacts differently with YSZ in different atmospheres. In air, m-ZrO(2) (monoclinic) is formed; while in N(2), SrZrO(3) and/or La(2)Zr(2)O(7) are formed depending on the initial LSM/YSZ ratio. The reactions are reversible with varying P(O(2)) i.e. treating the sample in air after the heat treatment in N(2) results in a decomposition of the formed La- and Sr-zirconates. The de-stabilisation of the LSM-YSZ interface under long-term annealing at 1,000 degrees C originates mainly from the inter-diffusion across the interface. Under reduced P(O(2)), the Mn diffusion from LSM into YSZ is enhanced. High P(O(2)) (>= 0.21 atm) promotes the m-ZrO(2) formation.

引用

页码：833 / 840

页数：8

共 27 条

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