Structure and Ionic Conductivity of Codoped Ceria for IT-SOFC Electrolytes

Abstract

Doped ceria is believed as the promising candidate for IT-SOFC electrolyte. Codoped strategy can increase the conductivity of single doped ceria at lower operating temperature. The purposes of this research were to synthesize and characterize several codoped Ce1-x-yGdxMyO2-gamma, M = Er, Dy, or Nd and 0.0 <= x,y <= 0.1. Solid state method was used due to it is a simple and suitable method for pilot scale. For the same total dopant concentration, the correlation between cation mean radii and the lattice parameter followed the Vegard&apos;s rule. The activation energies of codoped ceria were lower than 1 eV and most of codoped ceria showed conductivities higher than 10(-2) S.cm(-1) at intermediate temperature range (500-800 degrees C).