Abstract
Perovskites with nominal compositions Ln 0.8 Sr 0.2 CoO 3-δ (Ln=Gd, Nd, Pr, Sm, or Yb) were fabricated as cathode materials using a solid-state reaction method for low-temperature operating Solid-Oxide Fuel Cells (SOFCs). X-ray diffraction analysis and microstructure observation for the sintered samples were performed. The ac complex impedance was measured in the temperature range of 600-900℃ in air and fitted with a Solartron ZView program. The crystal structure, microstructure, electrical conductivity, and polarization resistance of Ln 0.8 Sr 0.2 CoO 3-δ were characterized systematically.
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