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首页> 外文期刊>International Journal of Electrochemical Science >Contrast Enhancement in Polymeric Electrochromic Devices Encompassing Room Temperature Ionic Liquids
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Contrast Enhancement in Polymeric Electrochromic Devices Encompassing Room Temperature Ionic Liquids

机译：包含室温离子液体的聚合物电致变色器件的对比度增强

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We report the preparation and spectro-electrochemical characterization of electrochromic devices(ECD) combining inkjet-printed WO3 as cathode and electro-deposited V2O5 as anode. ECD wereprepared for the first time with an optimized formulation of gel polymer electrolyte based onBisphenol A ethoxylate dimethacrylate and Poly(ethylene glycol) methyl ether methacrylate(BEMA/PEGMA) encompassing the Room Temperature Ionic Liquid (RTIL, 1-Ethyl-3- methylimidazolium bis(trifluoromethylsulfonyl)imide) as solvent. The UV-VIS spectrum of ECD was+ recorded at different potentials during Li insertion and de-insertion; additionally the PercentTrasmittance (T%) of ECD vs. time was investigated during repeated bleaching and coloring cyclesallowing thus the estimation of switching times and device stability. Due to the lower ionicconductivity and the apparent superior solvent permeability within WO3 active layer, RTIL containingECD showed slower switching times, but higher contrast with respect to the similar ones with EC/DECas solvent. These results indicate that the ECD containing environment-friendly RTIL electrolytes aresuitable for applications requiring high contrast, high safety and moderately fast switching times.
机译：我们报道了电致变色器件（ECD）的制备和光谱电化学表征，该器件结合了喷墨打印的WO3作为阴极和电沉积的V2O5作为阳极。首次使用基于双酚A乙氧基化物二甲基丙烯酸酯和聚（乙二醇）甲基醚甲基丙烯酸甲酯（BEMA / PEGMA）的凝胶聚合物电解质的优化配方首次制备了ECD，其中包含室温离子液体（RTIL，1-乙基-3-甲基咪唑鎓双（三氟甲基磺酰基）酰亚胺）作为溶剂。在锂的插入和插入过程中，以不同的电位记录了ECD的UV-VIS光谱。另外，在反复的漂白和着色循环过程中研究了ECD的百分透过率（T％）与时间的关系，从而估算了开关时间和器件稳定性。由于较低的离子电导率和在WO3活性层中明显的优越的溶剂渗透性，含ECD的RTIL显示出较慢的转换时间，但相对于使用EC / DECas溶剂的相似离子而言，对比度更高。这些结果表明，含有ECD的环保型RTIL电解质适用于需要高对比度，高安全性和适度快速切换时间的应用。

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