College of Materials Science and Engineering, State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle, Hunan University, Changsha, 410004, China.
Macromol Rapid Commun. 2024 Jul;45(13):e2300736. doi: 10.1002/marc.202300736. Epub 2024 May 7.
Electrochromic devices built with ionogel electrolytes are seen as a pivotal step toward the future of quasi-solid electrochromic devices, due to their striking properties like exceptional safety and high ionic conductivity. Yet, the poor mechanical strength of electrolyte of these devices remains a constraint that hampers their advancement. As a resolution, this research explores the use of a robust, transparent ionogel electrolyte, which is designed using an in situ microphase separation strategy. The ionogels are highly transparent and robust and exhibit excellent physicochemical stability, including a wide electrochemical window and high temperature tolerance. Benefitting from these properties, a high-performance electrochromic device is fabricated through in situ polymerization with the ionogels, PPRODOT as the electrochromic layer, and PEDOT: PSS as the ion storage layer, achieving high transmittance contrast (43.1%), fast response (1/1.7 s), high coloring efficiency (1296.4 cm C), and excellent cycling endurance (>99.9% retention after 2000 cycles). In addition, using ITO-poly(ethylene terephthalate) as flexible substrates, a deformable electrochromic device displaying high stability is realized, highlighting the potential use in functional wearables.
基于离子凝胶电解质的电致变色器件被视为准固态电致变色器件未来的关键一步，因为它们具有非凡的安全性和高离子电导率等显著特性。然而，这些器件的电解质机械强度差仍然是阻碍其发展的一个限制因素。有鉴于此，本研究探索了使用一种坚固、透明的离子凝胶电解质，该电解质采用原位微相分离策略设计。离子凝胶具有高透明度和坚固性，表现出优异的物理化学稳定性，包括宽电化学窗口和高温耐受性。得益于这些特性，通过原位聚合将离子凝胶、PPRODOT 作为电致变色层和 PEDOT：PSS 作为离子存储层，制备了一种高性能电致变色器件，实现了高透光率对比度（43.1%）、快速响应（1/1.7 s）、高着色效率（1296.4 cm C）和出色的循环耐久性（2000 次循环后保留率>99.9%）。此外，使用 ITO-聚对苯二甲酸乙二醇酯作为柔性基底，实现了具有高稳定性的可变形电致变色器件，突出了其在功能可穿戴设备中的潜在应用。
