Electrochromic Properties of Sol-gel Deposited V2O5 and TiO2-V2O5 Binary Thin Films
摘要
Transparent mixed phase (1 - x)V2O5-xTiO2 (x=0,0.1,0.2,0.3,0.4) thin films were prepared on indium tin oxide (ITO) coated glass via sol-gel process. The films were characterized by cyclic voltammetry, optical spectroscopy, scanning electron microscopy, IR and X-ray diffractometer.Electrochemical lithium insertion/extraction showed that the porous structure of sol-gel (1 -x)V2.O5-xTiO2 thin films exhibited good recharge ability of Li+/e- insertion/extraction process.For a 220 nm thick (1 - x)V2O5-xTiO2 film with 90% V2O5, the capacity of charge exchange reached 9 mC/cm2. In both Li+ intercalated and free states, the films were highly transparent to visible light. Such films have potential applications in counter electrodes for electrochromic smart windows and other electrochemical devices.