Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1634975 | Rare Metals | 2008 | 4 Pages |
Abstract
The performance of multi-layer (1 â x) La0.8Sr0.2MnO3/x YSZ 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)La0.8Sr0.2MnO3/x YSZ 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 Ï·cm2 and that of the monolayer composite cathode was 0.323 Ï·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.
Related Topics
Physical Sciences and Engineering
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Authors
Kening SUN, Jinhua PIAO, Naiqing ZHANG, Xinbing CHEN, Shen XU, Derui ZHOU,