Fabrication and performance of La(0.8)Sr(0.2)MnO3/YSZ graded composite cathodes for SOFC  

作　　者：SUN Kening PIAO Jinhua ZHANG Naiqing CHEN Xinbing XU Shen ZHOU Derui 

机构地区：[1]Department of Materials Science and Engineering, Beijing Normal University, Beijing 100875, China [2]Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China

出　　处：《Rare Metals》2008年第3期278-281,共4页稀有金属（英文版）

基　　金：This project is financially supported by the National Nature Science Foundation of China （No. 90510006）.

摘　　要：The performance of multi-layer （1 -x）La0.8Sr0.2MnO3/xYSZ graded composite cathodes was studied as electrode materials for intermediate solid oxide fuel cells （SOFC）. The thermal expansion coefficient, electrical conductivity, and electrochemical performance of multi-layer composite cathodes were investigated. The thermal expansion coefficient and electrical conductivity decreased with the increase in YSZ content. The （1 -x）Lao.sSr0.EMnO3/xYSZ composite cathode greatly increased the length of the active triple phase boundary line （TPBL） among electrode, electrolyte, and gas phase, leading to a decrease in polarization resistance and an increase in polarization current density. The polarization current density of the triple-layer graded composite cathode （0.77 A/cm2） was the highest and that of the monolayer cathode （0.13 A/cm2） was the lowest. The polarization resistance （Rp） of the triple-layer graded composite cathode was only 0.182 Ω·cm2 and that of the monolayer composite cathode was 0.323 Ω·cm2. The power density of the triple-layer graded composite cathode was the highest and that of the monolayer composite cathode was the lowest. The triple-layer graded composite cathode had superior performance.The performance of multi-layer （1 -x）La0.8Sr0.2MnO3/xYSZ graded composite cathodes was studied as electrode materials for intermediate solid oxide fuel cells （SOFC）. The thermal expansion coefficient, electrical conductivity, and electrochemical performance of multi-layer composite cathodes were investigated. The thermal expansion coefficient and electrical conductivity decreased with the increase in YSZ content. The （1 -x）Lao.sSr0.EMnO3/xYSZ composite cathode greatly increased the length of the active triple phase boundary line （TPBL） among electrode, electrolyte, and gas phase, leading to a decrease in polarization resistance and an increase in polarization current density. The polarization current density of the triple-layer graded composite cathode （0.77 A/cm2） was the highest and that of the monolayer cathode （0.13 A/cm2） was the lowest. The polarization resistance （Rp） of the triple-layer graded composite cathode was only 0.182 Ω·cm2 and that of the monolayer composite cathode was 0.323 Ω·cm2. The power density of the triple-layer graded composite cathode was the highest and that of the monolayer composite cathode was the lowest. The triple-layer graded composite cathode had superior performance.

关 键 词：MANGANITE composite cathode impedance spectrum triple phase boundary 

分 类 号：O64[理学—物理化学]