Abstract
Tungsten oxide (WO3) has received attention as an electrochromic material because of its excellent properties. However, the long switch time and low coloration efficiency of WO3 film limit its use. Herein, a nanocomposite film containing Preyssler-type polyoxometalate (POM) K12.5Na1.5[NaP5W30O110]·15H2O (P5W30) and WO3 nanoparticles has been fabricated by layer-by-layer (LbL) self-assembly methods and characterized by UV-Vis spectra, scanning electron microscopy, X-ray photoelectron spectroscopy and electrochemical workstation. Compared to the pure WO3 film, the [P5W30/WO3]20 film has better electrochromic properties. Then, the electrochromic properties of [P5W30/WO3]20 film were studied in different electrolyte. The results indicated that the composite film show high coloration efficiency (191.62 cm2 C− 1), fast switch time (2.58 s, 1.48 s), good CV stability (500 th) in 0.5 M LiClO4/PC electrolyte, and successfully assembled of an electrochromic device. These advantages can make the nanocomposite film become a promising candidate for potential application in electrochromic devices.
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