To improve the electrochromic performance of the WO3 film,the P2W17V-WO3 film based on vanadotungstate polyanion [P2W17VO62 ]7- and WO3 nanoparticles arrays has been fabricated via layer-by-layer self-assembly methods.The morphology of the P2W17V-WO3 film modified electrodes were characterized by scanning electron microscopy and atomic force microscopy.Electrochemical workstation and the UV-Vis spectra were used to analyze growth process and electrochromic properties of the P2W17V-WO3 film.Compared to many reported of the WO3 film,the P2W17V-WO3 film has an enhanced electrochemical performance with a larger optical modulation (23.93％),faster switching responses (3.03 s and 10.12 s for coloration and bleaching,respectively),higher CE (111.23 cm2/C),and the losses of it after 600 cycles is 6.9％.
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