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J. Korean Ceram. Soc. > Volume 51(4); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(4): 295.
doi: https://doi.org/10.4191/kcers.2014.51.4.295
중·저온형 고체산화물 연료전지 공기극 물질로 사용되는 이중층 페로브스카이트와 컴플렉스 페로브스카이트의 전기 전도도 비교
김정현
국립 한밭대학교 신소재공학과
Comparison of Electrical Conductivities in Complex Perovskites and Layered Perovskite for Cathode Materials of Intermediate Temperature-operating Solid Oxide Fuel Cell
Jung Hyun Kim
Department of Applied Materials Science and Engineering, Hanbat National University
ABSTRACT
Electrical conductivities of complex perovskites, layered perovskite and Sr doped layered perovskite oxides were measured and analyzed for cathode materials of Intermediate Temperature-operating Solid Oxide Fuel Cells (IT-SOFCs). The electrical conductivities of $Sm_{1-x}Sr_xCoO_{3-delta}$ (x = 0.3 and 0.7) exhibit a metal-insulator transition (MIT) behavior as a function of temperature. However, $Sm_{0.5}Sr_{0.5}CoO_{3-delta}$ (SSC55) shows metallic conductivity characteristics and the maximum electrical conductivity value compared to the values of $Pr_{0.5}Sr_{0.5}CoO_{3-delta}$ (PSC55) and $Nd_{0.5}Sr_{0.5}CoO_{3-delta}$ (NSC55). The electrical conductivity of $SmBaCo_2O_{5+delta}$ (SBCO) exhibits a MIT at about $250^{circ}C$. The maximum conductivity is 570 S/cm at $200^{circ}C$ and its value is higher than 170 S/cm over the whole temperature range tested. $SmBa_{0.5}Sr_{0.5}Co_2O_{5+delta}$ (SBSCO), 0.5 mol% Sr and Ba substituted at the layered perovskite shows a typically metallic conductivity that is very similar to the behavior of the SSC55 cathode, and the maximum and minimum electrical conductivity in the SBSCO are 1280 S/cm at $50^{circ}C$ and 280 S/cm at $900^{circ}C$.
Key words: Solid oxide fuel cell, Complex perovskite, Layered perovskite, Sr doped layered perovskite, Electrical conductivity
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