Layer-by-layer assembled WO3 and tungstophosphate nanocomposite with enhanced electrochromic properties
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Abstract
Construction of a nanocomposite WO3 film has been considered to be an important way to enhance electrochromic performance of the material. Herein, we fabricated a nanocomposite film containing WO3 nanoparticles, tungstophosphate clusters K6P2W18O62 (P2W18) and poly(ethylene imine) by the layer-by-layer method. The fabrication and morphology of composite materials were investigated by UV–Vis spectra and scanning electron microscopy. The electrochemical and electrochromic properties were also examined and compared with P2W18–WO3 composite film as well as individual P2W18 and WO3 thin film. The composite film supported a greater number of sites for Li+ ion intercalation and extraction due to its large active surface area. As a result, the composite film displays enhanced optical contrast (48.4 %) and coloration efficiency (46.1 cm2 C−1) by incorporation of P2W18 into the WO3 film. The enhanced electrochromic performances can be attributed to the composite structure, which provides large active surface area for electrochemical reactions and electrochromic performances. These results demonstrate that enhanced electrochromic properties could be achieved using the WO3 and P2W18 composite structure.
Keywords
Composite Film Optical Contrast Tungsten Trioxide Ethylene Imine Electrochromic PropertyNotes
Acknowledgments
This work was supported by the Natural Science Foundation of China (Grant No. 21301041), Postdoctoral Scientific Research Starting Foundation of Heilongjiang Province, China (No. LBH-Q15072), Harbin University of Commerce Doctor Start-up Fund Research (No. 12DW030), the Department of Education of Jilin Province (No. 2014349 and 2015431), Jilin Science and Technology Bureau (No. 20156418), Jilin Institute of Chemical Technology (No. 201343 and 2015031) and Natural Science Foundation of Heilongjiang Province of China (No. B201409).
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