Abstract
Alumina (Al 2O 3) is doped into cubic structured yttrium stabilized zirconia (ZrO 2) 0.92(Y 2O 3) 0.08 (YSZ) by a ceramic method. The influence caused by the access of Al 2O 3 on the sintering behavior, mechanical and electrical properties of YSZ are studied, and the mechanism is analyzed. The experiments show that doping Al 2O 3 to YSZ can significantly improve the sintering behavior by reducing sintering temperature. Impedance analysis shows that the electrical properties can be also improved by doping Al 2O 3 because of the improvement of grain boundary conditions. YSZ doped with different amount of Al 2O 3 have different grain boundary conductivities among which the highest value belongs to the specimen of YSZ doped with 4 wt% Al 2O 3. Pure YSZ and YSZ doped with 4 wt% Al 2O 3 are used as the electrolytes to make SOFCs. The performance of SOFC with an Al 2O 3 doped electrolyte is better than that with a pure YSZ one.
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