Enhanced Electrochromic Performance of Film Based on Preyssler-Type Polyoxometalate and Tungsten Oxide

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 WO(3)film limit its use. Herein, a nanocomposite film containing Preyssler-type polyoxometalate (POM) K12.5Na1.5[NaP5W30O110]center dot 15H(2)O (P5W30) and WO(3)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 WO(3)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 cm(2)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. Graphic