중저온형 SOFC를 위한 PSCF3737(Pr0.3Sr0.7Co0.3Fe0.7O3) 공기극 물질의 특성 및 최적화에 관한 연구
Study of Optimization and Characteristics of PSCF3737(Pr0.3Sr0.7Co0.3Fe0.7O3) for IT-SOFC
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Abstract
PSCF3737(Pr0.3Sr0.7Co0.3Fe0.7O3) is a good candidate cathode material for IT-SOFC(intermediate tempera-ture solid oxide fuel cel) because of high MIEC(mixed ionic electronic conductor) conductivity. In this study, thecharacteristics of PSCF3737 was investigated and optimizations of sintering temperature and thickness forPSCF3737(Pr0.3Sr0.7Co0.3Fe0.7O3) was carried out. Impedance responses were divided into two parts by frequencyregion. Middle frequency part (~102 Hz) was concerned with oxygen reduction reaction on surface and low frequencypart (~101 Hz) was related with oxygen diffusion. The reasonable sintering temperature and thickness of cathodewere 1200oC and about 27m with regard to EIS(electrochemical impedance spectroscopy). ASR(areas specific resis-tance) of optimized cathode is 0.15Ω.cm2 at 700oC.
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