碱土金属双掺杂的Ce_(0.9)Ca_(0.1-x)Sr_xO_(1.9)中温固体电解质的性能与应用

以固相反应方法合成了碱土 (Ca ,Sr)双掺杂的氧化铈基固溶体材料Ce0 .9Ca0 .1 -xSrxO1 .9(x =0 ,0 0 4,0 0 5 ,0 0 6 ,0 1)。结构研究表明 :碱土双掺杂的CeO2 呈立方萤石结构。利用阻抗谱研究了材料的离子导电性 ,发现碱土双掺杂有利于提高材料离子导电率 ,掺杂两种碱土金属离子的等效半径接近临界离子半径时导电率最高。将此系列材料作为电解质进行了燃料电池试验 ,发现电池的输出功率高于YSZ电解质及碱土单掺杂氧化铈 ,且电池输出开路电压亦高于单掺杂的情况。

Properties and Application of Double Alkali Earth Doped Ce_(0.9) Ca_0.1-x)Sr_xO_(1.90)

A series of ceria based solid solution material, Ce 0.9 Ca 0.1- x Sr x O 1.90 ( x =0, 0 04, 0 05 0 06), were synthesized by solid reaction method. Ceria with alkali earth double doped has a cubic fluorite structure. The ionic conductivity of these materials was studied by impedance spectra at high temperature, and an increasing effect of ionic conductivity was found. A maximum conductivity is achieved when the effective ionic radius is near the critical radius (0 1106nm). Some fuel cells were made using these materials as electrolyte. The output power and current of the SOFC with the electrolyte of double doped ceria are better than those of YSZ and single doped ceria. The open circuit voltage of the double doped ceria is also larger than that of the single doped ones.