Gd_2O_3和Y_2O_3共掺CeO_2基中温SOFC电解质材料的合成(英文)

Synthesis of Gd_2O_3 and Y_2O_3 Co-Doped Ceria-Based Electrolyte Materials for Intermediate Temperature SOFC

采用固相合成法合成Gd2O3和Y2O3共掺CeO2基粉料[(CeO2)0.92(Y2O3)0.08-x(Gd2O3)x,x=0,0.02,0.04,0.06,0.08,摩尔分数,下同],在1 600℃烧成制备固态氧化物燃料电池(solid oxide fuel cells,SOFC)电解质材料。采用X射线衍射仪、热膨胀测量仪和交流阻抗谱仪分别测试电解质材料的晶体结构、热膨胀系数和离子电导率。结果表明:烧成后的样品均为单一的萤石结构相;在CeO2-Y2O3-Gd2O3系统中,相比于单掺Y2O3的样品,300～700℃、掺杂量相同时,共掺样品表现出更高的离子电导率;单掺Gd2O3样品的离子电导率比x=0.02、0.04时的共掺样品的高,样品的离子电导率在x=0.06时达到最大值;所有样品的热膨胀均随温度的升高而线性增长。

Gd2O3 and Y2O3 co-doped CeO2-based solid oxide fuel cells（SOFC） electrolyte materials（CeO2）0.92（Y2O3）0.08-x（Gd2O3）x（x=0,0.02,0.04,0.06,0.08,mole fraction,the same below） were prepared by the solid reaction method and sintered at 1 600 ℃.Crystal structure,thermal expansion and ionic conductivity were characterized by the X-ray diffraction,dilatometry and alternating current impedance spectroscopy.Results show that all samples have single fluorite structures after being sintered at 1 600 ℃.Co-doped CeO2 samples have higher ionic conductivity than Y2O3-doped CeO2 with the same dosage at 300-700 ℃.The highest conductivity is achieved at x=0.06 in CeO2-Y2O3-Gd2O3 system,while Gd2O3-doped CeO2 exhibits higher conductivity in comparison to the co-doped samples with x=0.02 and 0.04.Thermal expansion increases linearly with increasing temperatures for all samples.