镱铝共掺杂氧化锆电解质材料制备与性能

Preparation and performance of ytterbia and alumina co-doped zirconia electrolyte material with high strength

采用固相法制备了镱铝共掺杂氧化锆电解质材料。实验结果表明:Al_2O_3(氧化铝)能促进电解质的烧结并提高电解质的抗弯强度。Al_2O_3对电导率的影响与Yb_2O_3(氧化镱)的掺杂量有关,仅当Yb_2O_3掺杂量为6%(摩尔分数)时,Al_2O_3掺杂有利于氧离子电导率。6%(摩尔分数)Yb_2O_3和0.5%(摩尔分数)Al_2O_3共掺杂的氧化锆电解质具有优异的抗弯强度和最高的氧离子电导率,以其作为支撑体的电池在800℃的功率密度为0.40W/cm^2。

The ytterbia and alumina co-doped zirconia electrolyte materials were synthsized by a solid-state method. The results revealed that Al2 O3-doping was beneficial for sintering and increasing flexural strength. The effect of Al2 O3-doping on ionic conductivity was in relation to the doping content of ytterbia. Only the ionic conductivity of sample with 6 % （mole fraction）Yb2 O3 was enhanced by alumina doping. 6% （mole fraction） Yb2O3 and 0. 5 % （mole fraction） Al2 O3. codoped zirconia electrolyte showed excellent bending strength and the best oxygen ionic conductivity. A maximum density of 0.40W/cm2 was measured at 800℃ for the cell with this material as electrolyte.