Electrochemical property of ordered mesoporous TiO2 films

Ordered mesoporous TiO2 films with high surface area and narrow pore size distribution have been synthesized by using triblock copolymer as the structure - directing agent in nonaqueous media, Electrochemical properties of mesoporous anatase TiO2 films have been studied by using cyclic voltammogram and potential step techniques. Large Li+ insertion capacitity was observed by cyclic voltammogram,and the double - layer capacitance has significant effect on cyclic voltammogram curves. The charge transfer coefficient is in the range of 0.15 similar to 0.4 for Li+ extraction, and the diffusion coefficient is estimated to be in the range of (4.71 similar to 55.8) x 10(-12)cm(2)/s. These results show that the electrochemical properties of Li+ ion insertion of mesoporous anatase TiO2 films with high surface area are different from those of normal TiO2 films prepared without surfactant.