Abstract: TiO2 films doped Ce and Sm were prepared by solgel methods with butyltitanate(Ti(OC4H9)4)， cerium nitrate(Ce(NO3)3·6H2O) and samarium nitrate(Sm(NO3)3·6H2O) as main raw materials on the ITO conductive glass substrate. The molar fractions of Ce and Sm are 0， 2%， 5% and 10%， respectively. Cyclic voltammetry and optical properties were studied using the electrochemical workstation and ultraviolet visible spectroscopy. The results showed that the film had the largest peak current and strongest ion storage capacity when Ce and Sm doping content was 2%， the injection charge density was up to 1512mC·cm-2and K value was 07. When the contents of Ce and Sm increased to 5% and 10%， the peak current decreased and the charge storage ability reduced with the increase contents of Ce and Sm. The colored state of TiO2 films doped Ce and Sm was pretty shallow. Transmittance was more than 90% in both the colored state and bleached state. Therefore TiO2 films doped Ce and Sm had good transparency in the visible light range and would be used as ion storage materials in the electrochromic glass.

Key words: electrochromic property, ion storage film, TiO2, doped rare earth, solgel