电解质
超级电容器
材料科学
自愈水凝胶
乙烯醇
自愈
离子电导率
化学工程
氧化石墨
纳米技术
储能
电容
石墨烯
复合材料
高分子化学
化学
电极
聚合物
功率(物理)
物理化学
病理
工程类
替代医学
物理
医学
量子力学
作者
Hui Peng,Yaya Lv,Ganggang Wei,Jiezi Zhou,Xiaojie Gao,Kanjun Sun,Guofu Ma,Ziqiang Lei
标识
DOI:10.1016/j.jpowsour.2019.05.058
摘要
Although the hydrogel electrolytes for flexible energy-storage device have made great progress, it still remains a huge challenge to assemble a smart supercapacitor with high ionic conductivity and excellent self-healing when suffering physical damage. Herein, a novel self-healing hydrogel electrolyte (B-PVA/KCl/GO) is designed and prepared through graphite oxide (GO) doped into a diol-borate ester bonding cross-linked poly(vinyl alcohol) network. It is found that the moderate amount of GO-doped into hydrogel (2.3 wt% GO, 47.5 mS/cm) is obviously improved ionic conductivity compared with bare B-PVA/KCl hydrogel (32.6 mS/cm). Interestingly, the B-PVA/KCl/GO hydrogel electrolyte exhibits excellent self-healing capability that can repair its original configuration with 5 min when it is cut. Moreover, the activated carbon-based supercapacitor with B-PVA/KCl/GO hydrogel electrolyte delivers high specific capacitance of 156 F g−1 at 0.3 A g−1 and can also restore its capacitive performances via 7 times healing cycles without external stimulus. The presented work provides a new strategy to construct a flexible and self-healing hydrogel to apply for wearable electronics, smart apparels or flexible robots.
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