Synthesis and Properties of Ba<sub>1-x</sub>Sr<sub>x</sub>Zr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3-δ</sub> Electrolyte Materials

采用甘氨酸–硝酸盐燃烧法合成了Ba1-xSrxZr0.1Ce0.7Y0.1Yb0.1O3-δ (x = 0, 0.25, 0.5, 0.75, 1)系列钙钛矿电解质材料，系统探究了Sr元素掺杂对BZCYYb电解质材料的物相结构、烧结活性及电化学性能的影响。X射线衍射结果可以看出不同Sr掺杂的BZCYYb粉体主相均为钙钛矿结构。烧结实验表明，Sr掺杂能够提升电解质粉体烧结活性，粉体可在1350℃烧结致密。电化学阻抗谱测试表明，随着Sr含量增加粉体电导率先升高后降低，Ba0.75Sr0.25Zr0.1Ce0.7Y0.1Yb0.1O3-δ电导率最高，700℃时可达18.77 × 10−3 S·cm−1，通过阿伦尼乌斯关系拟合活化能为0.59 eV。A series of Ba1-xSrxZr0.1Ce0.7Y0.1Yb0.1O3-δ (x = 0, 0.25, 0.5, 0.75, 1) perovskite-type electrolyte materials were synthesized via the glycine-nitrate combustion method. The effects of Sr doping on the phase structure, sinterability, and electrochemical performance of BZCYYb electrolytes were systematically investigated. X-ray diffraction results confirmed that all Sr-doped BZCYYb powders retained a single-phase perovskite structure. Sintering experiments demonstrated that Sr doping significantly enhanced the sintering activity of the electrolyte powders, enabling dense ceramic pellets to be obtained at 1350˚C. Electrochemical impedance spectroscopy revealed that the electrical conductivity of the materials initially increased and then decreased with higher Sr content. The Ba0.75Sr0.25Zr0.1Ce0.7Y0.1b0.1O3-δ composition exhibited the highest conductivity of 18.77 × 10−3 S·cm−1 at 700˚C, with an activation energy of 0.59 eV calculated from the Arrhenius relationship.