三苯胺
电致变色
轨道能级差
材料科学
共轭体系
超级电容器
电容
噻吩
光电子学
聚合物
纳米技术
化学
电极
有机化学
物理化学
复合材料
分子
作者
Yingchao Zhang,Fu-Quan Bai,Yunfei Xie,Meihua Zhu,Hailong Li,Daqiang An,Duomei Xue,Erik B. Berda,Caiyun Wang,Geyu Lu,Xiaoteng Jia,Danming Chao
标识
DOI:10.1016/j.cej.2022.138386
摘要
Flexible electrochromic supercapacitors (ECSCs) consisting of conjugated polymer electrodes are promising for integrating optical modulation with sustainable energy storage. However, there remain formidable challenges to achieving long-term cycling stability while maximizing high device output voltage. Here, we design a new twisted conjugated polymer bearing dual-redox centers (thiophene and triphenylamine) and an electron-withdrawing cyano group. The as-prepared conjugated polymer showcases elevated discharge potential and highly efficient charge transport synchronously, attributed to the lowered energy of the lowest unoccupied molecular (LUMO) orbitals and twisted alignment of the polymer chain. Coupled with the transparent vanadium pentoxide (V2O5) nanowires ion-storage material, the flexible ECSC affords a high optical contrast of 67 %, wide voltage window of 2 V, large capacitance of 32.9 mF/cm2, and outstanding cycling durability (86 % capacitance and 96 % optical modulation retention after 7000 cycles at 0.2 mA/cm2). This molecular engineering strategy and insight illustrated by density functional theory (DFT) calculation together with electrochemical kinetics analysis provide another way along the route toward the synergetic improvement of electrochromic and energy storage performance.
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