A hydrogel electrolyte with dynamically Tunable mechanical properties for wide-temperature flexible supercapacitor

作     者：Han, Jun Fan, Changchun Li, Dian-sen Jiang, Lei 

作者机构：Beihang Univ Sch Chem Key Lab Bioinspired Smart Interfacial Sci & Techno Minist Educ Beijing 100191 Peoples R China 

出 版 物：《JOURNAL OF POWER SOURCES》 (J Power Sources)

年 卷 期：2025年第631卷

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：National Natural Science Foundation of China Project of the Science and Technology Commission of Military Commission [2022-JCJQ-JJ-0177] Aeronautical Science Foundation of China [2022Z057051004] Opening Foundation of State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology Foundation of Advanced Fiber Materials Engineering Research Center of Anhui Province [2023AFMC04] Foundation of State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment, Dalian University of Technology [GZ23111] 

主　　题：Antifreeze Flexibility Dynamic coordination Water retention Supercapacitor 

摘      要：The application of conductive polymer hydrogels in flexible energy storage devices has gained a great deal of attention. In this paper, the hydrogel integrating water retention and antifreeze properties is realized by the organic binding of polyvinyl alcohol (PVA) chains and NaClO4. The composite hydrogel is assembled with MnO2/ carbon fiber and activated carbon fiber to constitute a flexible quasi-solid-state supercapacitor. The capacitor can cycle 25,000 times with the capacitance retention of 81 % when exposed directly to the external environment. In addition, the capacitor can store charge consistently and stably between-40 degrees C and 40 degrees C. This demonstrates the excellent environmental stability of the composite gel, which ensures stable operation of the device under extreme conditions. Excitingly, the mechanics of PVA composite gel electrolyte can be dynamically coordinated using the Hofmeister effect. The longer the flexible quasi-solid supercapacitor is soaked in 1.5 M Na2SO4 solution, the stronger the mechanical properties are. There are new thoughts in engineering new flexible supercapacitors with this biological compatibility and multi-functional conductive hydrogel.