Tao Mengxin, Liu Guodong, Wang Yaoli, Wang Jianing, Zhang Wenliang, Li Zhijian
College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an 710021, China.
ACS Appl Mater Interfaces. 2024 Oct 9;16(40):54316-54327. doi: 10.1021/acsami.4c14196. Epub 2024 Sep 25.
The electrode optimization and rational design are of great significance for the performance enhancement of self-powered electrochromic devices (ECDs). It can be effectively enhanced by developing interfacial properties of electrodes, which can promote the internal ion transport within functional components consisting of an electrode, electrochromic layer, and electrolyte layer and thus obtain performance improvement of fabricated devices. This work aims to construct the electrode of poly(3,4-ethylenedioxythiophene): polystyrenesulfonate (PEDOT:PSS) on different substrates and promote interface performance of the prepared electrodes via inheriting the surface topography of substrates. Besides, the prepared PEDOT:PSS electrodes as a dual-function layer including the electrochromic and electrode layer are employed to assemble the ECDs. It is found that the intrinsic roughness of the paper substrate can facilitate the electrochemical performance of the prepared PEDOT:PSS electrode on it effectively, thereby showing a superior electrochemical surface area and diffusion coefficient as well as a lower charge-transfer resistance of 13.56 Ω. Similarly, for the prepared self-powered ECD on the paper substrate, it also indicates a high light absorption property (0.413), well-defined electrochromic contrast (33.09), fast switching (τ = 4.0 s, τ = 6.8 s), high coloration efficiency (92.275 cm C), high areal capacity (10.93 mAh m) at 0.01 mA cm, and lower equivalent series resistance (176.2 Ω) in comparison to parallel ECDs on the PET and glass substrate. Leveraging the intrinsic roughness of the substrate is able to enhance the electrochemical performance of electrodes, which can also provide a new strategy for the construction of high-performance self-powered ECDs.
电极的优化与合理设计对于自供电电致变色器件（ECD）性能的提升具有重要意义。通过开发电极的界面特性可以有效增强其性能，这能够促进由电极、电致变色层和电解质层组成的功能组件内部的离子传输，从而实现所制备器件的性能提升。这项工作旨在在不同基底上构建聚（3,4 - 乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）电极，并通过继承基底的表面形貌来提升所制备电极的界面性能。此外，将制备的PEDOT:PSS电极作为兼具电致变色和电极层功能的双层来组装ECD。研究发现，纸基底的固有粗糙度能够有效促进其上所制备的PEDOT:PSS电极的电化学性能，从而展现出优异的电化学表面积和扩散系数，以及低至13.56 Ω的电荷转移电阻。同样，对于在纸基底上制备的自供电ECD，与在PET和玻璃基底上的平行ECD相比，它还表现出高光吸收特性（0.413）、清晰的电致变色对比度（33.09）、快速切换（τ = 4.0 s，τ = 6.8 s）、高着色效率（92.275 cm²/C）、在0.01 mA/cm²下的高面积容量（10.93 mAh/m²）以及更低的等效串联电阻（176.2 Ω）。利用基底的固有粗糙度能够增强电极的电化学性能，这也为构建高性能自供电ECD提供了一种新策略。
