Preparation method for ferric oxide coated tin dioxide nanometer polycrystalline microballoon

The invention relates to a preparation method for ferric oxide coated tin dioxide nanometer polycrystalline microballoons, and belongs to the technical field of preparation of new energy materials of inorganic compounds. The ferric oxide coated tin dioxide nanometer polycrystalline microballoons are prepared by the hydrothermal method with cane sugar, urea, tin tetrachloride and ferric trichloride as raw materials. The method comprises the following steps: dissolving tin tetrachloride in water, adding cane sugar, carrying out stirring for 0.5 hour at room temperature, putting the obtained solution into a hydro-thermal vessel with a volume of 45 ml, heating the solution to a temperature of 180 DEG C for a hydro-thermal reaction for 24 hours, carrying out centrifugal separation when the reaction is finished, and carrying out rinsing with considerable deionized water so as to obtain black powder; dissolving ferric trichloride and urea in a mixed solution of ethanol and water, adding the black powder into the sol