Research & Development on Cost Reduction of SOFC Materials (2) - Evaluation of Lanthanum-Concentrate for SOFC materials -

This R&D is focused on cost reduction of SOFC modules by application of lanthanum-concentrate to lanthanum chromite separator and/or lanthanum manganite cathode. A database, which was described in a previous report, was created with respect to the solution limit, relative density, and thermal expansion behaviors of lanthanum chromite perovskite when light rare earth elements(Ln=Ce, Pr, Nd) were substituted for high-purity La 2 O 3 . In this study, electrical conductivities and chemical stability of such lanthanum chromite separators have been investigated. In addition, a database was made with respect to the solubility and thermal expansion behaviors of lanthanum manganite cathode in which La was substituted by Ln, in order to examine the effects of various combinations of Ln elements on the cathode.