Abstract
The performance of multi-layer (1 − x) La 0.8Sr 0.2MnO 3/ 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)La 0.8Sr 0.2MnO 3/ 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/cm 2) was the highest and that of the monolayer cathode (0.13 A/cm 2) was the lowest. The polarization resistance ( R p) of the triple-layer graded composite cathode was only 0.182 ω·cm 2 and that of the monolayer composite cathode was 0.323 ω·cm 2. 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.
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