Abstract
The Sc 2 O 3 -ZrO 2 system, which has higher electrical conductivity compared to the Y 2 O 3 -ZrO 2 system, was examined for electrolyte component of the planar type SOFC. For low temperature operation, the effect of cathode material and Sc 2 O 3 dopant concentration in electrolyte were investigated; maximum power density of 0.6 W/cm 2 was obtained for electrolyte-supported cells using humidified H 2 as fuel and air as oxidant at 800°C. Furthermore, the maximum power density of 2.4 W/cm 2 was obtained for anode-supported cells in humidified H 2 as fuel and O 2 as oxidant at 800°C.
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