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고체산화물 연료전지용 (La, Sr)$MnO_3$ 양극에 대한 Co 첨가효과
김재동,김구대,이기태 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.6
The effect of Co dopant on the (La, Sr)MnO3 cathode was investigated. La2Zr2O7 and SrZrO3 were formed as the reaction products between YSZ and LSMC. The reactivity of LSMC with YSZ increased with increasing Co content. However, the cathodic polarization resistance decreased with increasing Co doping. Therefore, doping Co at Mn site in the (La, Sr)MnO3 cathode was effective on controlling the polarization resistance of the cathode. The polarization property of LSMC-YSZ composite(60 wt%: 40 wt%) cathode was better than that of LSMC single cathode.
LSM과 YSZ의 분말크기 및 분말크기비가 SOFC의 양극특성에 미치는 영향
김재동,김구대,박지애 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.3
The LSM-YSZ composite electrode as a mixture of LSM and YSZ shows percolation characteristics. It was identified that the polarization resistance of LSM-YSZ composite electrode depend on YSZ connectivity by changing powder size ratio of the DLSM/DYSZ. That is, YSZ in composite electrode showed low electrochemical activity without YSZ connectivity. However, the polarization resistance decreased abruptly with YSZ connectivity due to high electrochemical activity of YSZ in composite electrode. Because the amount of three phase boundary is dependent on LSM and YSZ particle size, the polarization resistance of cathode decreases as LSM and YSZ particle size decreases.
LSMC-YSZ Composite 양극의 임피던스 특성
김재동,김구대,문지웅,김창은,이동아 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.9
YSZ와 계면반응하지 않는 ${(La_{0.75}Sr_{0.25})}_{0.95}Mn_{0.8 }Co_{0.2}O_3$에 전해질 물질인 YSZ를 첨가하여 양극의 분극특성을 고찰하였다. LSMC에 YSZ를 첨가함에 따라 삼상계면(Three Phase Boundary)이 증가하고, 분극저항이 감소하여 60 : 40wt% 비에서 최소값을 나타내었다. LSMC-YSZ composite 전극은 $1200^{\circ}C$ 에서 소결하여 최소의 분극저항을 나타내었고, 정전용량의 값은 소결온도의 증가에 따라 증가하였다. The polarization characteristics of the cathodes were discussed which were composed YSZ and ${(La_{0.75 }Sr_{0.25 })}_{0.95}Mn_{0.8 }Co_{0.2}O_3$ The three-phase-boundary length increased with the addition of YSN resulting in the minimum po-larization resistance at 60(LSMC) : 40(YSZ) wt% When LSMC-YSZ compoiste cathodes was sintered at $1200^{\circ}C$ minimum polarization resistance was observed and the capacitace increased with increasing sintering tem-perature.