关键词: TiO2薄膜, 电致变色, PC+LiClO4电解质, 电极过程, 异相反应

Abstract: The working electrode was prepared by way of depositing TiO2 thin film on conductive ITO glass substrate via sol-gel method. As 3-electrode testing system was then formed combining it with SCE (saturated calomel electrode) as reference one, black platinum electrode as auxiliary one and PC + LiClO4 solution as electrolyte. The TiC2 thin film was characterized by AFM, SEM and XRD to test the cyclic volt-ampere characteristic curves of the potential of the working electrode at the scanning voltages ± 0.5 V, ± 1.0 V and ± 2.0 V. Testing results showed that on the curve at ± 2.0 V the Li⁺ inserting and extracting peaks appear clearly and that the Li⁺ plays a role as a rate determining step in the electrode process kinetics of the diffusion rate in the electrolyte and TiC2 thin film. However, no Li⁺ inserting and extracting peaks appear on the curves at ± 1.0V and ± 0.5 V. It implies that the potential of working electrode is the rate determining step of the electrode process kinetics. A conclusion is drawn that the scanning potential should be greater than ± 2.0 V when studying the characteristics of heterophase reaction kinetics.