Electrolyte for solid oxide fuel cell and preparation method thereof

The invention relates to an electrolyte for a solid oxide fuel cell and a preparation method thereof. In order to improve the performance of the electrolyte of the solid oxide fuel cell, the invention adopts a nitrate gel combustion method to prepare 30%BaCe0.8Y0.2O2.9-70%Ce0.8Gd0.2O1.9 electrolyte. When the electrolyte is used for the solid oxide fuel cell, the operating temperature of the cell is intermediate temperate 600-800 DEG C, but the operating temperature of the traditional solid oxide fuel cell is high temperate 900-1000 DEG C. The relative density of the electrolyte achieves 100 percent. Under the humid air atmosphere (3%H2O) and the temperature 700 DEG C, the conductivity is 0.01S/cm and is higher than the conductivity of the commonly-used electrolytes Ce0.8-Gd0.2O1.9 and BaCe0.8Y0.2O2.9 prepared by the same method.