超级电容器
电解质
电化学
材料科学
电容
储能
电化学窗口
化学工程
自愈水凝胶
纳米技术
电极
化学
高分子化学
工程类
离子电导率
物理化学
功率(物理)
物理
量子力学
作者
Qi Zhang,Ruili Ren,Jingwen Hu,Ying Chen,Youming Guo,Yue Huang,Junfu Wei,Huan Zhang,Qingsong Pang,Xiaoqing Zhang,Huicai Wang
出处
期刊:Small
[Wiley]
日期:2024-04-01
标识
DOI:10.1002/smll.202400369
摘要
Hydrogel electrolyte can endow supercapacitors with excellent flexibility, which has developed rapidly in recent years. However, the water-rich structures of hydrogel electrolyte are easy to freeze at subfreezing and dry at high temperatures, which will affect its energy storage characteristics. The low energy density of micro supercapacitors also hinders their development. Herein, a strategy is proposed to reduce the free water activity in the hydrogel to improve the operating voltage and the energy density of the device, which is achieved through the synergistic effect of the hydrogel skeleton, N, N'-dimethylformamide (DMF), NaClO4 and water. High concentrations of DMF and NaClO4 are introduced into sodium alginate/polyacrylamide (SA/PAAM) hydrogel through solvent exchange to obtain SA/PAAM/DMF/NaClO4 hydrogel electrolyte, which exhibited a high ionic conductivity of 82.1 mS cm-1, a high breaking strength of 563.2 kPa, and a wide voltage stability window of 3.5 V. The supercapacitor devices are assembled by the process of direct adhesion of the hydrogel electrolyte and laser induced graphene (LIG). The micro-supercapacitor exhibited an operating voltage of 2.0 V, with a specific capacitance of 2.41 mF cm-2 and a high energy density of 1.34 µWh cm-2, and it also exhibit a high cycle stability, good flexibility, and integration performance.
科研通智能强力驱动
Strongly Powered by AbleSci AI