高比表面积Y-掺杂二氧化铈纳米颗粒和纳米棒的制备及电学性质

摘要

分别通过室温老化和高温沉降热处理成功的合成了大量均匀的Y-掺杂铈纳米颗粒和纳米棒,并对Y-掺杂铈粉末中Y的含量和形态对于固体溶液性质的影响进行了研究.结果表明,Y的掺杂大大提高了铈纳米颗粒和纳米棒的比表面积,其中30％的Y-掺杂纳米颗粒的比表面积最大,可达197 m2·g-1.此外,所制备的粉末可以很容易被烧结和硬化,而相应的电解质具有良好的电学性质,其中Y0.3Ce0.7O1.85纳米颗粒电解质在850℃时具有最大电导率(4.32 S·m-1)和最小表观活化能(0.81 eV).%Large-scaled uniform Y-doped ceria nanoparticles and nanorods were synthesized via room-temperature aging and hydrothermal treatments of high-temperature precipitates,respectively.The influence of Y content and morphology of the Y-doped ceria powders on the solid solution properties was studied.The specific surface areas (SBET) of both the nanoparticles and nanorods were greatly enhanced by Y-doping,and the highest SBET was 197m2·g-1 in 30 mol％ Y-doped ceria nanoparticles.Moreover,the as-prepared powders could be easily sintered and densified,and the corresponding electrolyte possesses good electrical properties,Y0.3Ce0.7O1.85 nanoparticles electrolyte has a maximum total electrical conductivity (4.32 S ·m-1) and minimum apparent activation energy (0.81 eV) at 850 ℃.