| Characterization of Ln0.8Sr0.2CoO3-δ (Ln=Gd, Nd, Pr, Sm, or Yb) as Cathode Materials for Low-Temperature SOFCs |
| Jung-Woon Choi, Ju-Hyun Kang, Han-Ji Kim, Kwang-Soo Yoo |
| Department of Materials Science and Engineering, University of Seoul |
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| ABSTRACT |
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Perovskites with nominal compositions $Ln_{0.8}Sr_{0.2}CoO_{3-delta}$ (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 $600-900^{circ}C$ in air and fitted with a Solartron ZView program. The crystal structure, microstructure, electrical conductivity, and polarization resistance of $Ln_{0.8}Sr_{0.2}CoO_{3-delta}$ were characterized systematically. |
| Key words:
SOFC, Cathode materials, Polarization resistance, Impedance, Porosity |
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