新型电解质材料CaZr0.1Ti0.9O3的制备与电性能研究

采用溶胶-燃烧法合成了可用于固体氧化物燃料电池(SOFC)的新型固体电解质材料CaZr_0.1Ti_0.9O₃。通过XRD、交流复阻抗等电化学方法对样品的结构、电导性能进行了表征，并考察了材料的烧结性能。结果表明，溶胶-燃烧法可以成功制备出具有良好烧结性能的CaZr_0.1Ti_0.9O₃电解质粉末，1400℃下得到的烧结体的相对密度可达到95%。电性能测试表明CaZr_0.1Ti_0.9O₃烧结体在中温范围内具有较高的氧离子电导率（σ^_800℃＝2.24×10^-3 S/cm）、低的电导活化能（0.89 eV）；样品的导电性能受烧结温度的影响，合理的控制烧结温度对于获得导电性能优良的CaZr_0.1Ti_0.9O₃电解质材料具有重要作用。

Preparation and Characterization of Novel Electrolyte Material CaZr0.1Ti0.9O3

Single-phase and ultrafine CaZr_0.1Ti_0.9O₃electrolyte material for solid oxide fuel cell (SOFC) has been synthesized by a newly sol-combustion method. The structure and conduction properties of the sample were systematically investigated using XRD and electrochemical methods. With the research on properties of CaZr_0.1Ti_0.9O₃， a conclusion can be drawn that CaZr_0.1Ti_0.9O₃ electrolyte material prepared by sol-combustion method has a high sintering activity, and CaZr_0.1Ti_0.9O₃ceramic could reach 95% of the theoretical density at a sintering temperature of 1400 ℃. Electrochemistry measurements showed that the CaZr_0.1Ti_0.9O₃ceramics had relatively high oxide ionic conductivities(σ^_800℃＝2.24×10^-3 S/cm), low electrical activation energy (E_a=0.89 eV) in low-temperature range. The influence of sinter temperature on conductivity of electrolyte was also introduced, and sintering temperature should be controlled properly in order to get excellent electrical property.