Low Temperature Preparation of LaNi1-xFexO3 as New Cathode Material for SOFC - Advantage of Liquid Phase Mixing Method -

Abstract

Preparation of LaNi1-xFexO3, which is one of the candidate materials of solid oxide fuel cell cathode with high electrical conductivity and resistance against Cr poisoning, was examined with liquid phase mixing method and solid state reaction method. Single phase LaNi1-xFexO3 has successfully been prepared irrespective of composition by low temperature sintering as 750 oC with liquid phase mixing method, whereas large amount of raw materials have remained with solid state reaction method by sintering at the same temperature. It can be ascribed to more homogenous cation distribution in raw powder material prior to sintering with liquid phase mixing method. It has also been revealed that LaNi1-xFexO3 with x lower than 0.3 is thermodynamically unstable in air above 1000 oC. LaNi0.6Fe0.4O3 showed superior property as cathode material with high electrical conductivity, thermodynamic stability and appropriate sintering property.