Soluble triarylamine functionalized symmetric viologen for all-solid-state electrochromic supercapacitors
作者:Yanling Zhuang、Weiwei Zhao、Longlu Wang、Feiyang Li、Weikang Wang、Shujuan Liu、Wei Huang、Qiang Zhao
DOI:10.1007/s11426-020-9789-9
日期:2020.11
Electrochromic supercapacitors have drawn enormous attention due to their ability to monitor the charge and discharge processes through color changes of electroactive materials. However, there are few work on small organic molecules as active materials for all-solid-state electrochromic supercapacitors. Herein, we reported two novel multifunctional symmetric viologens (TPA-bpy and CZ-bpy), which showed different solvatochromic, electrochromic, electroluminochromic and energy storage behaviors despite their similar chemical structures. The different performances between these two viologens were attributed to the difference in the intramolecular charge transfer capability and the solubility in organic solvents. Devices containing TPA-bpy displayed faster response time and higher coloration efficiency due to the introduction of packing-disruptive and three-dimensional triarylamine groups. Moreover, devices containing TPA-bpy also showed energy storage characteristics with an obvious color change from purple to yellow. It showed a wide voltage window (2.0 V), long discharge time (230.3 s at 0.01 mA cm−2), and excellent cycling stability with 90% capacitance retention after 6,000 cycles. The work provides a new and convenient strategy towards the development of novel electrochromic capacitive materials.
电致变色超级电容器能够通过电活性材料的颜色变化来监测充放电过程,因而备受关注。然而,将小分子有机物作为全固态电致变色超级电容器活性材料的研究却很少。在此,我们报告了两种新型多功能对称紫胶(TPA-bpy 和 CZ-bpy),尽管它们的化学结构相似,但却表现出不同的溶解变色、电变色、电致发光变色和储能行为。这两种病毒原的不同性能归因于分子内电荷转移能力和在有机溶剂中的溶解度不同。含有 TPA-bpy 的器件响应时间更快,着色效率更高,这是因为引入了具有堆积破坏作用的三维三芳基胺基团。此外,含有 TPA-bpy 的器件还显示出储能特性,颜色从紫色明显变为黄色。它具有宽电压窗口(2.0 V)、长放电时间(0.01 mA cm-2 时 230.3 秒)和出色的循环稳定性,6000 次循环后电容保持率达 90%。这项研究为开发新型电致变色电容材料提供了一种新的便捷策略。