Abstract
An optimized thermoset gel polymer electrolyte based on Bisphenol A ethoxylate dimethacrylate and Poly(ethylene glycol) methyl ether methacrylate (BEMA/PEGMA) was prepared by facile photo-induced free radical polymerisation technique and tested for the first time in electrochromic devices (ECD) combining WO3sputtered on ITO as cathodes and V2O5electrodeposited on ITO as anodes. The behaviour of the prepared ECD was investigated electrochemically and electro-optically. The ECD transmission spectrum was monitored in the visible and near-infrared region by varying applied potential. A switching time of ca. 2 s for Li+insertion (coloring) and of ca. 1 s for Li+de-insertion (bleaching) were found. UV-VIS spectroelectrochemical measurements evidenced a considerable contrast between bleached and colored state along with a good stability over repeated cycles. The reported electrochromic devices showed a considerable enhancement of switching time with respect to the previously reported polymeric ECD indicating that they are good candidates for the implementation of intelligent windows and smart displays.
Highlights
Electrochromic (EC) materials have attracted considerable attention due to their potential application in several types of optical devices including intelligent windows and smart displays
An optimized thermoset gel polymer electrolyte based on Bisphenol A ethoxylate dimethacrylate and Poly(ethylene glycol) methyl ether methacrylate (BEMA/PEGMA) was prepared by facile photo-induced free radical polymerisation technique and tested for the first time in electrochromic devices (ECD) combining WO3 sputtered on Indium-doped tin oxide- (ITO) as cathodes and V2O5 electrodeposited on ITO as anodes
We developed an optimized gel polymer electrolyte membrane which can work at the same time as separator, electrolyte, and glue keeping the EC device together
Summary
Electrochromic (EC) materials have attracted considerable attention due to their potential application in several types of optical devices including intelligent windows and smart displays. They can change colour in a persistent and reversible way by potential-promoted ion insertion/deinsertion mechanism. Vanadium oxide (V2O5) is a good candidate for EC devices as it is a lithium battery cathode material, which shows different colours with Li+-ion insertion and it can be proposed as an adequate counter electrode in rocking-chair ECDs. V2O5based thin films can be prepared by various techniques [7], such as sol-gel, electrochemical, and vacuum deposition, for for example, evaporation [8] and sputtering [9]. The effect of mesoporosity on the kinetics of V2O5 thin films, investigated by Liu et al [10], showed that an enhanced charge-discharge rate for porous samples can be achieved
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