Synthesis and Characterization of Ce_(0.8)Y_(0.2-x)Ca_xO_(2-δ) as Electrolyte for Solid Oxide Fuel Cells

摘要

In this study, ultrafine Ce_(0.8)Y_(0.2-x)Ca_xO_(2-δ) (x = 0 to 0.1) powders have been successfully prepared by the sol-gel method. The samples were characterized by TG-DSC, XRD and AC impedance. Experimental results indicated that highly phase-pure cubic fluorite electrolyte Ce_(0.8)Y_(0.2-x)Ca_xO_(2-δ) powders were obtained. The Ce_(0.8)Y_(0.2-x)Ca_xO_(2-δ) series electrolytes have higher relatively dense over 96 % can obtained after sintered at 1400 °C. Among all the samples, Ce_(0.8)Y_(0.1)Ca_(0.1)O_(1.85) shows excellent ionic conductivity of 0.041 S/cm measured at 800 °C and lower conductive activation energy of 0.89 eV.