小提琴手
材料科学
电致变色
聚合物
离子液体
电致变色装置
化学工程
光化学
有机化学
复合材料
化学
电极
工程类
物理化学
催化作用
作者
Xilu Wu,Qingchao Fan,Zhiyuan Bai,Qinghong Zhang,Weizhong Jiang,Yaogang Li,Chengyi Hou,Kerui Li,Hongzhi Wang
出处
期刊:Small
[Wiley]
日期:2023-05-04
卷期号:19 (37)
被引量:19
标识
DOI:10.1002/smll.202301742
摘要
Viologens-based electrochromic (EC) devices with multiple color changes, rapid response time, and simple all-in-one architecture have aroused much attention, yet suffer from poor redox stability caused by the irreversible aggregation of free radical viologens. Herein, the semi-interpenetrating dual-polymer network (DPN) organogels are introduced to improve the cycling stability of viologens-based EC devices. The primary cross-linked poly(ionic liquid)s (PILs) covalently anchored with viologens can suppress irreversible face-to-face contact between radical viologens. The secondary poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP) chains with strong polar groups of -F can not only synergistically confine the viologens by the strong electrostatic effect, but also improve the mechanical performance of the organogels. Consequently, the DPN organogels show excellent cycling stability (87.5% retention after 10 000 cycles) and mechanical flexibility (strength of 3.67 MPa and elongation of 280%). Three types of alkenyl viologens are designed to obtain blue, green, and magenta colors, demonstrating the universality of the DPN strategy. Large-area EC devices (20 × 30 cm) and EC fibers based on organogels are assembled to demonstrate promising applications in green and energy-saving buildings and wearable electronics.
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