Abstract: The electrolyser was divided into the cathode chamber and the anode chamber by the septum of the anion-exchange membrane. When hydrogen ions in the cathode chamber were consumed under
the electrolyzing process with a constant current density on the cathode, titanyl ions were promoted to react to hydroxide ions produced by electrolyzing
to form uniform deposition of hydrous titania. Titania with different crystal phaseswas produced under different temperatures. TEM and XRD analyses show that the
nanoparticles are spherical and with the average size from 30 to 50nm at 773K, and mainly anatase phase at 873K containing
3.85% rutile. The mechanism of forming ultrafine powder was elementarily investigated.

Key words: electrolytic method, titania, ultrafine