有序中孔纳米多晶TiO~2薄膜的Li^+嵌脱行为

Ordered mesoporous TiO ₂ 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 TiO ₂ 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 0.15-0.4 for Li ⁺ extraction, and the diffusion coefficient is estimated to be in the range of (4.71-55.8) × 10 ^-12cm ²/s. These results show that the electrochemical properties of Li ⁺ ion insertion of mesoporous anatase TiO ₂ films with high surface area are different from those of normal TiO ₂ films prepared without surfactant.