HIGH IONIC CONDUCTIVE ELECTROLYTE SUPPORT AND UNIT CELL FOR SOLID OXIDE FUEL CELL

摘要

The present invention relates to a plate type zirconia electrolyte support. The plate type zirconia electrolyte support has the chemical formula of (Re_2O_3)_x(ZrO_2)_1-x and utilizes complex rare earth oxide (Re_2O_3) as a stabilizer. The capacity of the total complex oxide stabilizer is 0.08<=X<=0.12. The complex rare earth oxide consists of ytterbium oxide (Yb_2O_3) and scandium oxide (Sc_2O_3). The plate type zirconia electrolyte support is given a sintered density of 95% or more by using zirconia electrolyte powder having scandium oxide, from solid electrolyte, which has a capacity of 0.02<=Sc_2O_3<0.05. The plate type zirconia electrolyte support is stabilized into a cubic structure without any phase change at a constant temperature of 1000°C and has an oxygen ion conductivity of 0.07 S/cm or more under normal atmospheric conditions and at a temperature of 800°C. The thickness of the plate type zirconia electrolyte support is 100-200 um and the area is 25-400 cm^2. [Reference numerals] (AA) Contour chart of viscosity (amount of components); (BB) Powder; (CC) Binder; (DD) Solvent; (EE) Viscosity