Synthesis and impedance analysis of gadolinium-doped cerium electrolyte

Gadolinium-doped ceria-based electrolyte (at 20 % dopant cation) was prepared for intermediate temperature solid oxide fuel cells (ITSOFCs). The fine powder has been synthesized by a simple and fast freeze drying method at relatively low temperature. The XRD results showed that the powder has a single phase with cubic fluorite structure. The SEM results exhibited that electrolyte pellets sintered at 1100 °C was dense, and the relative density of pellet was over 96 %. Impedance spectra analysis of this electrolyte has been performed at 200-850 °C. The results displayed that Ce08Gd02O2-5 appeared higher conductivity at the temperature range of 550-700 °C.