Abstract:To improve optical property and coloration effect, La, Nd and Bi co-doped TiO2 films were synthesized via a Sol-Gel method, by using butyl titanate as precursor on the surface of ITO glass substrate. Structural surface morphologies and electrochromic properties of the as-prepared films were examined with TG-DTA、XRD、UV-vis and Electrochemical workstation. The results showed that anatase TiO2 formed from TiO2 dry gels after heat treatment at 400℃, 500℃, 600℃, and showing tendency of the higher the temperature heat treatment, the more complete the crystal development. La, Nd and Bi doped TiO2 increased the disorder of the TiO2 octahedron, resulting in increase of the amorphized degree. TiO2 films prepared with acurate 12% tetrabutyl titanate exhibited the best electrochemic properties. TiO2 films heat-treated at 500℃ showed excellent electrochemical properties. TiO2 films separately doped with molar amount fraction of 8%La, 18%Nd, 6%Bi, possess excellent electrochemic properties,and single doping effect is in the order of 6% Bi < 8 %La<18% Nd. La-Nd-Bi co-doped TiO2 is anatase with a very high amorphized degree, with the best cyclic valtammentry and highest amorphized degree when the molar amount ratio of La:Nd:Bi=4:10:2.