Oxygen permeation fluxes through La₂Cu_0.5Ni_0.5O_4+δ dense ceramics: Comparison with oxygen diffusion coefficients

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• 作者：F. Mauvy ; E. Boehm ; J.M. Bassat ; J.C. Grenier ; J. Fouletier
• 关键词：Lanthanum nickelate ; Oxygen permeation ; IT-SOFC cathode ; Oxygen diffusion coefficient
• 刊名：Solid State Ionics
• 出版年：2007
• 期刊代码：96_01672738
• 类别：ch
• 出版时间：15 July 2007
• 卷：178
• 期：19-20
• 页码：1200-1204
• 文件大小：362 K

摘要

The copper-substituted lanthanum nickelate (La₂Ni_0.5Cu_0.5O_4+δ) was investigated as possible cathode material for intermediate temperature solid oxide fuel cells because of its mixed ionic and electronic conducting properties (MIEC oxide). The La₂Ni_0.5Cu_0.5O_4+δ compound was prepared using the “nitrate–citrate” route. Oxygen permeation fluxes through dense membranes have been measured under various oxygen partial pressure gradients in the 850–1200 K temperature range. The oxygen transport properties are compared with the previous measurements using isotopic exchange depth profile experiments and conductivity relaxation method: all of them show a very good agreement.