Carbon nanotubes-assisted polyoxometalate nanocomposite film with enhanced electrochromic performance

• Published in: Electrochimica acta 2011-10, Vol.56 (24), p.8156-8162
• Main Authors: Liu, Shuping, Xu, Lin, Li, Fengyan, Guo, Weihua, Xing, Yan, Sun, Zhixia
• Format: Article
• Language: English
• Subjects: Acetal resins; Carbon nanotubes; Chemistry; Displays; Electrochemistry; Electrochromic; Electrochromism; Exact sciences and technology; General and physical chemistry; Layer-by-Layer; Miscellaneous (electroosmosis, electrophoresis, electrochromism, electrocrystallization, ...); Multilayers; Nanocomposites; Nanomaterials; Nanostructure; Performance enhancement; Polyoxometalates
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2011.05.131

The optical contrast achieves 20.3% by incorporation of CNTs into the P 2W 18 films, showing the CNTs could obviously improve the electrochromic performances of POMs-based films. [Display omitted] ► The effect of carbon nanotubes on the electrochromic performances of polyoxometalate-based films was investigated in detail. ► The electrochromic performances of the composite material is obviously improved by incorporation of carbon nanotubes into the P 2W 18 films ► The optical contrast and coloration efficiency achieve 20.3% and 91.5 cm 2 C −1, respectively. ► Electrochemically induced oxidation–reduction reaction is related with electrochromism. A nanocomposite film containing polyoxometalates (POMs) cluster K 6P 2W 18O 62·14H 2O (P 2W 18), carbon nanotubes (CNTs) and chitosan (CS) was fabricated by layer-by-layer (LbL) methods. The composite material displays enhanced electrochromic performance, with the optical contrast of 20.3% and coloration efficiency of 91.5 cm 2 C −1 at 620 nm. Furthermore, the composite material displays the increased thickness and surface roughness by incorporation of CNTs into the P 2W 18 film. Obviously, the presence of CNTs has the strong influence on the multilayer structure, leading to high optical contrast and coloration efficiency. The results demonstrate the essential role of CNTs in enhancing functionality on POMs for applications of electrochromic devices.