Abstract
Poly(ethyl methacrylate), PEMA and poly(vinylidenefluoride-co-hexafluoropropylene), PVdF-HFP have been blended in the weight ratio 70:30. The blend has been incorporated with lithium trifluoromethanesulfonate (LiCF3SO3) and added with ethylene carbonate (EC) and propylene carbonate (PC). The sample 70wt.% PEMA/PVdF-HFP – 30wt.% LiCF3SO3 exhibits the highest room temperature ionic conductivity of 2.87×10−7 S cm−1 for the blend-salt system. The sample in the PC system (designated 6PC) has the highest room temperature conductivity of 1.46×10−6 S cm−1. The highest conducting EC system has conductivity of 1.05×10−4 S cm−1 and the sample is designated as 6EC. The polymeric gel electrolytes are transparent and mechanically stable at room temperature. An electrochromic device (ECD) with configuration glass/FTO/WO3/sample/CeO2-TiO2/FTO/glass utilizing S30, 6PC and 6EC as electrolytes have been fabricated. The cyclic voltammogram (CV) of glass/FTO/WO3/6EC/CeO2-TiO2/FTO/glass shows a cathodic peak occurring at −1.3V upon coloration while an anodic peak is observed at −0.8V during bleaching process.
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