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Timestamp: 2019-04-25 18:22:41+00:00

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英文摘要 In this study, using the metal tungsten powder and hydrogen peroxide as starting materials, and adding polyethylene glycol (PEG, MW = 20,000) to prepare precursor. Dried anhydrous ethanol and dichloromethane as the solvent of the precursor prepared PEG-template WO3 thin film by sol / gel and spin coating method. Adding PEG to WO3 precursor to modify WO3 thin films microstructure by changing the ratio of PEG / W. The thin film surface component, microstructure analysis obtained from SEM and TEM respectively. In situ potentiostat / galvanostat and UV / Vis study of measuring quantitative and qualitative analysis (electrochemical performance, colored / bleaches state, modulation transmittance and coloration efficiency). Diffusion coefficient of Li ion in the thin film obtained from EIS. As PEG / W = 1 / 2 (w / w), WO3 thin film is amorphous phase by XRD. HR-TEM image reveals that the PEG-template WO3 thin film have line lattice with 5 ~ 8 nm. Combining the XRD, SEM and HT-TEM results, we conclude that the PEG-template WO3 thin film has porous nanostructure of nanocrysrtalline WO3 embedded in an amorphous WO3 matrix. W-P33 thin film has the much better electro-optical performance (ΔT = 93.95% @ 700 nm, tc / tb = 19.09 s / 3.82 s, C.E. = 50.56 cm2/C).
Adding TTNB, photoelectron provider, to be modified WO3 thin film to form photoelectrochromic devices. The above thin film was working electrode and sputtering Pt on the ITO was counter electrode. The electrolyte solution was 0.5 M LiI /PC. On open circuit state, PECD was placed under UV exposure machine (365 nm, 18 mW/cm2) for coloring. W90 (W / Ti = 90 / 10 (mol/mol)) thin film has much better optic properties (ΔT = 23.18 %, 92.68 % ~ 69.50 %). For electrochromic prpperties, it also has great performance (ΔT = 86.86 %, 7.98 % ~ 94.84 % @700 nm, tc / tb = 18.86 s / 3.17 s, C.E. = 43.79 cm2/C).
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