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 WO3film limit its use. Herein, a nanocomposite film containingPreyssler-type polyoxometalate (POM) K12.5Na1.5[NaP5W30O110]·15H2O (P5W30) and WO3nanoparticles has been fabricatedby layer-by-layer (LbL) self-assembly methods and characterized by UV-Vis spectra, scanning electron microscopy, X-rayphotoelectron spectroscopy and electrochemical workstation. Compared to the pure WO3film, the [P5W30/WO3]20 filmhas better electrochromic properties. Then, the electrochromic properties of [P5W30/WO3]20 film were studied in differentelectrolyte. The results indicated that the composite film show high coloration efficiency (191.62 cm2C−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 electrochromicdevice. These advantages can make the nanocomposite film become a promising candidate for potential application inelectrochromic devices.
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 WO3film limit its use. Herein, a nanocomposite film containingPreyssler-type polyoxometalate (POM) K12.5Na1.5[NaP5W30O110]·15H2O (P5W30) and WO3nanoparticles has been fabricatedby layer-by-layer (LbL) self-assembly methods and characterized by UV-Vis spectra, scanning electron microscopy, X-rayphotoelectron spectroscopy and electrochemical workstation. Compared to the pure WO3film, the [P5W30/WO3]20 filmhas better electrochromic properties. Then, the electrochromic properties of [P5W30/WO3]20 film were studied in differentelectrolyte. The results indicated that the composite film show high coloration efficiency (191.62 cm2C−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 electrochromicdevice. These advantages can make the nanocomposite film become a promising candidate for potential application inelectrochromic devices.