Characterisation of La_(1-x)Sr_(1+x)Fe_(1-y)Al_yO_(4-δ) as IT-SOFC Cathode Materials^

摘要

The selection of an appropiate cathode material is of interest for the development of intermediate temperature solid oxide fuel cells (IT-SOFCs). Perovskite-type oxides (ABO3) have been mainly investigated as cathode due to their electrocatalytic properties, however these materials have some drawbacks such as chemical and thermal incompatibility with commonly used electrolytes. A2BO4 oxides with K2NiF4-type structure are alternative cathode materials due to an improvement of the termomechanical stability. Several authors have investigated these kinds of materials for SOFC applications. Herein, La_(1-x) Sr_(1+x)Fe_(1-y)Al_yO_(4-δ) (x=0, 0.1; y=0, 0.1, _(0.2)) compositions have been investigated as potential cathode materials for doped lanthanum gallate-electrolyte-based IT-SOFCs with a focus on their chemical compatibility with the electrolyte, electrical conductivity and area-specific resistance.^