Electrical Conducting Properties of LSF-based Composites as an Interconnection of Tubular Type of Solid Oxide Fuel Cells

摘要

We investigated La_(0.8)Sr_(0.2)FeO_(3-δ) (LSF)-based composite materials as the interconnection for tubular SOFCs. LSF is a mixed ionic and electronic (hole) conducting material and thus shows low electrical conductivity in reducing (H_2) atmosphere. However, composite materials with LSF and ceria show moderate electrical conductivity by electronic leakage current through doped ceria and LSF. LSF-GDC composite and LSF layers were successfully deposited on NiO-YSZ anode substrate by conventional co-firing process. The area specific resistance of LSF/LSF-GDC bilayer on Ni-YSZ measured in air//H_2 condition was initially ～50 mΩ cm~2.