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배중면,강인용,유영성,김기현,지현진,김정현,임성광 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.12
This study aims to investigate the functional analysis of anode and cathode materials in Anode supported Solid Oxide Fuel Cell. The concentration polarization of single cell was investigated with CFD (Computational Fluid Dynamics) method for the case of the different morphology by using four types of unit cell and discussed to reduce the concentration polarization. The concentration polarization at anode side effected the voltage loss in Anode supported Solid Oxide Fuel Cell and increased contact areas between fuel gas and anode side could reduce the concentration polarization. For intermediate temperature operation, Anode-supported single cells with thin electrolyte layer of YSZ (Yttria-Stabilized Zirconia) were fabricated and short stacks were built and evaluated. We also developed diesel and methane autothermal reforming (ATR) reactors in order to provide fuels to SOFC stacks. Influences of the H2O/C (steam to carbon ratio), O2/C (oxygen to carbon ratio) and GHSV (Gas Hourly Space Velocity) on performances of stacks have been investigated. Performance of the stack operated with a diesel reformer was lower than with using hydrogen as a fuel due to lower Nernst voltage and carbon formation at anode side. The stack operated with a natural gas reformer showed similar performances as with using hydrogen. Effects of various reformer parameters such as H2O/C and O2/C were carefully investigated. It is found that O2/ C is a sensitive parameter to control stack performance.
중저온형 SOFC를 위한 PSCF3737(Pr0.3Sr0.7Co0.3Fe0.7O3) 공기극 물질의 특성 및 최적화에 관한 연구
배중면,박광진,이창보,김정현,백승욱 한국전기화학회 2007 한국전기화학회지 Vol.10 No.3
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.