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 ce0.8gd_0.2o_2-δ appeared higher conductivity at the temperature range of 550–700 °c.