Intermediate temperature SOFC single cell test using Nd_1.95NiO_4 + δ as cathode

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• 作者：C. Lalanne ; F. Mauvy ; E. Siebert ; M.L. Fontaine ; J.M. Bassat ; F. Ansart ; P. Stevens ; J.C. Grenier
• 关键词：Transition metal oxides ; Fuel cells ; Mixed conducting oxides
• 刊名：Journal of the European Ceramic Society
• 出版年：2007
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：2007
• 卷：27
• 期：13-15
• 页码：4195-4198
• 文件大小：244 K

摘要

This work deals with SOFC single cell tests using neodymium nickelate Nd_1.95NiO_{4 + δ} as cathode material. This MIEC oxide exhibits high values of both surface exchange coefficient (k) and oxygen diffusion coefficient (D^*), as well as high electronic conductivity, which result in an enhanced electrochemical activity with respect to classical materials. The SOFC cells were fabricated from an anode-supported electrolyte half-cell provided by InDEC B.V. Corporation, with a 36 mm diameter. The Nd_1.95NiO_{4 + δ} cathode was prepared as a two-stage electrode consisting of a thin interlayer of several hundred nanometers covered by a thicker layer of dozens microns. The Nd_1.95NiO_{4 + δ} oxide powders were synthesized using different routes in order to reduce the final annealing temperature, and to subsequently obtain submicronic powders. I–V characteristics of the single cells were investigated under hydrogen–air conditions. The power densities versus current densities curves are reported and the results of impedance spectroscopy measurements performed under these operating conditions are discussed.