文献类型：期刊文献

英文题名：In Situ Polymerization of Hydrogel Electrolyte on Electrodes Enabling the Flexible All-Hydrogel Supercapacitors with Low-Temperature Adaptability

作者：Zhang, Yijing[1,2] Sun, Yue[1,2] Nan, Jingya[1] Yang, Fusheng[1] Wang, Zihao[1] Li, Yuxi[1] Wang, Chuchu[1] Chu, Fuxiang[1,2] Liu, Yupeng[1,2] Wang, Chunpeng[1,2]

第一作者：Zhang, Yijing

通信作者：Nan, JY[1];Liu, YP[1];Wang, CP[1];Liu, YP[2];Wang, CP[2]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Key Lab Biomass Energy & Mat, Nanjing 210042, Jiangsu, Peoples R China;[2]Nanjing Forestry Univ, Coinnovat Ctr Efficient Proc & Utilizat Forest Res, Nanjing 210037, Jiangsu, Peoples R China

年份：2024

外文期刊名：SMALL

收录：;EI(收录号：20240615511794);Scopus(收录号：2-s2.0-85184242549);WOS:【SCI-EXPANDED(收录号:WOS:001157481900001)】；

基金：This work was supported by the National Natural Science Foundation of China (32071724), the Natural Science Foundation of Jiangsu Province (BK20220213), and the Fundamental Research Funds of Jiangsu Key Laboratory of Biomass Energy and Material (JSBEM-S-202210, JSBEM-S-202102).

语种：英文

外文关键词：all-hydrogel; flexible supercapacitors; low-temperature; robust interface

摘要：All-hydrogel supercapacitors are emerging as promising power sources for next-generation wearable electronics due to their intrinsic mechanical flexibility, eco-friendliness, and enhanced safety. However, the insufficient interfacial adhesion between the electrode and electrolyte and the frozen hydrogel matrices at subzero temperatures largely limit the practical applications of all-hydrogel supercapacitors. Here, an all-hydrogel supercapacitor is reported with robust interfacial contact and anti-freezing property, fabricated by in situ polymerizing hydrogel electrolyte onto hydrogel electrodes. The robust interfacial adhesion is developed by the synergistic effect of a tough hydrogel matrix and topological entanglements. Meanwhile, the incorporation of zinc chloride (ZnCl2) in the hydrogel electrolyte prevents the freezing of water solvents and endows the all-hydrogel supercapacitor with mechanical flexibility and fatigue resistance across a wide temperature range of 20 degrees C to -60 degrees C. Such all-hydrogel supercapacitor demonstrates satisfactory low-temperature electrochemical performance, delivering a high energy density of 11 mWh cm(-2) and excellent cycling stability with a capacitance retention of 90% over 10000 cycles at -40 degrees C. Notably, the fabricated all-hydrogel supercapacitor can endure dynamic deformations and operate well under 2000 tension cycles even at -40 degrees C, without experiencing delamination and electrochemical failure. This work offers a promising strategy for flexible energy storage devices with low-temperature adaptability.