Abstract
The electrical conductivity and phase stability of ZrO 2 co-doped with Sc 2O 3 and CeO 2 were investigated in order to search for a better solid electrolyte material, which can be applicable for intermediate- or low-temperature solid oxide fuel cells (SOFCs). Present study showed that ZrO 2 doped with Sc 2O 3 and CeO 2 did not show any phase transition during heat treatment up to 1250–1550 °C and was exceedingly stable as a cubic phase in all temperature ranges. The ZrO 2 co-doped with Sc 2O 3 and CeO 2 showed much higher electrical conductivity than YSZ in the whole temperature range of 300–1100 °C and better long-term stability than any other Sc-ZrO 2-based electrolyte. From the long-term performance check of the 5×5 cm 2 unit cell operation, we could verify that ZrO 2 co-doped with Sc 2O 3 and CeO 2 can be a strong candidate electrolyte material for intermediate- or low-temperature SOFC.
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