Nucera Antonello, Rizzuto Carmen, Pipita Mario Michele, Barba Castagnaro Irene, Termine Roberto, Barberi Riccardo C, Castriota Marco
Department of Physics, University of Calabria, Via Ponte Bucci, Cubo 33B, 87036 Rende, CS, Italy.
CNR-Nanotec c/o, Department of Physics, University of Calabria, Via Ponte Bucci, Cubo 33B, 87036 Rende, CS, Italy.
Gels. 2024 Oct 25;10(11):694. doi: 10.3390/gels10110694.
In this work, electrochromic devices were prepared using the redox couple ethyl viologen diperchlorate and 1,1'-diethyl ferrocene in propylene carbonate as an aprotic solvent to facilitate ions separation and diffusion inside the devices. Electrochromic devices were made using electrochromic gel mixtures at the concentrations of 55%, 60% and 65% with respect to the bisphenol A polymer. In particular, two sets of gels were made: one set contained the bisphenol A not-polymerized while and the second one contained the polymerized polymer. Different techniques, such as cyclic voltammetry, UV-vis-NIR, and Raman spectroscopy, were used to study such systems to understand the differences in terms of performances between the different sets of electrochromic devices. Cyclic voltammetry confirmed that the oxidation process of the 1,1'-diethyl ferrocene and the reduction of the ethyl viologen diperchlorate occurred at about 0.4 V. Interesting variations in the transmittances were found between the two groups of samples. The best values of CE were provided by the electrochromic devices based on the polymerized electrochromic gel mixture at a concentration of 60% (EM). The EM device result was CE = 92.82 C/cm in the visible region and CE = 80.38 C/cm in the near-infrared region, confirming that these devices can be used for energy-saving applications. A structural characterization of the materials used in the two sets of electrochromic devices was made using Raman spectroscopy, and the analysis supports the electrochemical models used to explain the processes involved during operation of the electrochromic systems.
在这项工作中，使用高氯酸乙酯紫精和1,1'-二乙基二茂铁的氧化还原对在碳酸丙烯酯（一种非质子溶剂）中制备电致变色器件，以促进离子在器件内部分离和扩散。使用相对于双酚A聚合物浓度为55%、60%和65%的电致变色凝胶混合物制作电致变色器件。具体而言，制作了两组凝胶：一组含有未聚合的双酚A，另一组含有聚合后的聚合物。使用不同技术，如循环伏安法、紫外-可见-近红外光谱和拉曼光谱，来研究此类系统，以了解不同组电致变色器件在性能方面的差异。循环伏安法证实1,1'-二乙基二茂铁的氧化过程和高氯酸乙酯紫精的还原过程发生在约0.4V。在两组样品之间发现了有趣的透过率变化。基于浓度为60%（EM）的聚合电致变色凝胶混合物的电致变色器件提供了最佳的CE值。EM器件的结果是在可见光区域CE = 92.82 C/cm，在近红外区域CE = 80.38 C/cm，证实这些器件可用于节能应用。使用拉曼光谱对两组电致变色器件中使用的材料进行了结构表征，该分析支持了用于解释电致变色系统运行过程中所涉及过程的电化学模型。
