Abstract:

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.

Key words: CaZr_0.1Ti_0.9O₃, sol-combustion method, perovskite structure, electrical conductivity