Preparation and Conductivity Research of Zinc Ions Doped La9.33(SiO4)6O2 Electrolyte

Abstract

Solid electrolyte as a conductive medium has a good application prospect in the field of fuel cells. In order to improve the conductivity at low and medium temperature. The electrolyte of apatite type lanthanum silicateLa9. 33(SiO4)6O2 (ATLS) was doped with Zn at position of Si using urea nitrate combustion method. And XRD, SEM, IR were performed for ATLS electrolytes doped with Zn. The results showed that the combustion synthesis of zinc doped ATLS powders have apatite crystal structure after calcined 12 hours. Zn doping into the ATLS lattice has little impact on the crystal structure and morphology. Analysis of samples determine the best sintering temperature at 1250 for the La9. 33Si6-xZnxO26-x electrolyte. The electrolyte has good resistance stability by AC impedance test. When the amount of zinc ions doped x = 1. 0, the La9. 33Si6-xZnxO26-x has the highest ionic conductivity. Doping a moderate amount of ion at Si can enhance the conductivity of the ATLS electrolyte.