Synthesis and Characterization of Double-Doped Bismuth Oxide Electrolytes for Lower Temperature SOFC Application

摘要

High ionic conductivity double-doped bismuth oxide materials were synthesized using solid state and wet chemical methods to achieve lower total doping while maintaining phase stability. The ionic conductivity for Dy-Gd stabilized bismuth oxide (DGSB), Dy-W stabilized bismuth oxide (DWSB), and Dy-Ce stabilized bismuth oxide (DCSB) at 650℃ are measured to be 0.94 S/cm, 0.53 S/cm, and 0.45 S/cm respectively. The nanopowder forms were incorporated into a bilayer electrolyte and successfully sintered dense onto a prefabricated anode and single electrolyte substrate. DGSB achieved the highest power density of 1.31 W/cm~2, twice that of the single-doped erbium stabilized bismuth oxide case with the same configuration (0.60 W/cm~2) as a result in the improvement in conductivity over the single-doped case.