Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2022-07-29 , DOI: 10.1016/j.cej.2022.138311
Tao Cheng , Feng Wang , Yi-Zhou Zhang , Lang Li , Si-Ya Gao , Xuan-Li Yang , Shi Wang , Peng-Fei Chen , Wen-Yong Lai
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Conductive polymer hydrogels (CPHs), especially poly(3,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) hydrogels, have become research hotspot because they demonstrate tremendous application potential in cutting-edge technologies such as flexible electrochemical energy storage, bioelectronics, and wearable electronics due to their unique electrical, electrochemical and mechanical properties. However, the existing gelation strategies generally fail to achieve excellent electrical and mechanical properties simultaneously in PEDOT:PSS hydrogels and limit their broad applications. Herein, an effective gelation strategy is developed to achieve a kind of free-standing PEDOT:PSS hydrogels by double-additive induced physical cross-linking. Through the interconnection and entanglement between conductive PEDOT nanofibril chains in the physical cross-linking network, the electrical, mechanical and electrochemical properties can be synergistically optimized. The resulting PEDOT:PSS hydrogels simultaneously show ultra-high electrical conductivity, excellent mechanical stretchability, high resilience, low Young’s moduli, superior swelling behavior, and extrusion 3D printability, demonstrating extensive applicability. As proof of concept applications, substrate-free, highly elastic all-gel supercapacitors (SCs) have been fabricated using the resulting PEDOT:PSS hydrogels as electrodes. The SCs exhibit simple structure, facile assembly process, high specific capacitance, excellent energy storage capacity, superior cyclic stability, and arbitrary deformability, holding great promise for wearable electronics.
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用于独立弹性全凝胶超级电容器的 3D 可打印导电聚合物水凝胶具有超高导电性和出色的拉伸性
导电聚合物水凝胶(CPHs),尤其是聚(3,4-乙烯二氧噻吩):聚(苯乙烯磺酸盐)(PEDOT:PSS)水凝胶,因其在柔性电化学储能等尖端技术中显示出巨大的应用潜力而成为研究热点、生物电子学和可穿戴电子学由于其独特的电学、电化学和机械性能。然而,现有的凝胶化策略通常无法在 PEDOT:PSS 水凝胶中同时实现优异的电气和机械性能,并限制了它们的广泛应用。在此,开发了一种有效的凝胶化策略,通过双添加剂诱导的物理交联来实现一种独立的 PEDOT:PSS 水凝胶。通过物理交联网络中导电PEDOT纳米纤维链之间的互连和缠结,可以协同优化电气、机械和电化学性能。所得的 PEDOT:PSS 水凝胶同时表现出超高导电性、优异的机械拉伸性、高回弹性、低杨氏模量、优异的溶胀行为和挤出 3D 打印性,展示了广泛的适用性。作为概念应用的证明,已经使用所得的 PEDOT:PSS 水凝胶作为电极制造了无基板、高弹性的全凝胶超级电容器 (SC)。SCs具有结构简单、组装工艺简单、比电容高、储能能力强、循环稳定性好、可任意变形、