有序中孔纳米多晶TiO~2薄膜的Li^+嵌脱行为

以三嵌段高分子非离子表面活性剂为结构导向剂，在非水条件下，合成了具有均一孔径分布(6.5nm)、高比表面积的稳定的中孔纳米多晶TiO~2薄膜。用循环伏安与电位阶跃技术研究了薄膜的Li^+离子嵌入反应。结果表明，由非离子表面活性剂导向而成的中孔TiO~2薄膜具有较大的Li^+离子嵌入容量，伏安特性中双电层电容效应非常显著，Li^+离子在脱嵌过程中电荷传递系数在0.15～0.4之间，嵌入系数为(4.7～55)×10^-^1^2cm^2/s。这些结果显示了具有大的比表面中孔TiO~2薄膜具有不同一般Li^+离子嵌入TiO~2薄膜的电化学反应特征。

Electrochemical property of ordered mesoporous TiO~2 films

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^-^1^2 cm^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.