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Gd2O3和Y2O3共掺CeO2基中温SOFC电解质材料的合成

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Abstract:

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1600℃烧成制备固态氧化物燃料电池(solidoxidefuelcells,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。

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