The Effect of La-Doped on Electrical and Structural Properties of Ce-Based Solid Oxide Fuel Cell Electrolyte

Abstract

In this paper, the Ce-0.8(Sm0.5-x Y0.5Lax)(0.2)O2-delta (x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) electrolyte ceramics were fabricated by using the solid-state reaction method. We investigated the electrical and structural properties of Ce-0.8(Sm0.5-x Y0.5Lax)(0.2)O2-delta electrolyte ceramics with variation in La contents. All samples showed a fluorite structure and no secondary phase. With increasing La contents, resistance of Ce-0.8(Sm0.5-x Y0.5Lax)(0.2)O2-delta electrolyte ceramics decreased until x = 0.3. When the La content was 0.3, Ce-0.8(Sm0.5-x Y0.5Lax)(0.2)O2-delta electrolyte ceramics showed the highest level of electrical properties. The values of conductivity and activation energy were 1.54 x 10(-3) S cm(-1) and 0.413 eV, respectively.