OXYGEN DIFFUSION THROUGH SILVER CATHODES FOR SOLID OXIDE FUEL-CELLS

被引：76

作者：

VANHERLE, J

MCEVOY, AJ

机构：

[1] Institut de Chimie Physique II, Ecole Polytechnique Fédérale de Lausanne

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1994年 / 55卷 / 04期

关键词：

SOLID OXIDE FUEL CELLS; OXYGEN REDUCTION; OXYGEN DIFFUSION IN SILVER; IMPEDANCE SPECTROSCOPY;

D O I：

10.1016/0022-3697(94)90230-5

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The oxygen reduction mechanism at the interface O2,Ag/YSZ (yttria-stabilized zirconia) was investigated by impedance spectroscopy and current-overpotential recording. Oxygen partial pressure was varied between 10(-4) and 1 atm, and temperature between 600 and 850-degrees-C. Both dense and porous silver electrodes were studied. Bulk diffusion of oxygen atoms through the solid silver was identified as the rate-determining mechanism. A second, smaller contribution is ascribed to dissociative adsorption of oxygen molecules on the silver electrode. Good agreement with known data for the diffusion and solubility of oxygen in silver is obtained.

引用

页码：339 / 347

页数：9

共 27 条

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