超级电容器
材料科学
电解质
电极
乙烯醇
电容
聚吡咯
复合材料
储能
弯曲
电化学
复合数
化学工程
纳米技术
聚合物
聚合
化学
功率(物理)
物理
物理化学
量子力学
工程类
作者
Kanjun Sun,Enke Feng,Guohu Zhao,Hui Peng,Ganggang Wei,Yaya Lv,Guofu Ma
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2018-11-10
卷期号:7 (1): 165-173
被引量:96
标识
DOI:10.1021/acssuschemeng.8b02728
摘要
Integrated configuration can greatly improve the stability of an energy-storage device in a large or repeated mechanical deformation process, but there is little attention paid to develop this conceptual energy-storage device. Here, we successfully design two embedded polypyrrole (PPy) layers as electrodes and a boron cross-linked PVA(poly(vinyl alcohol))/KCl hydrogel film as electrolyte to construct an integrated electrode–electrolyte–electrode flexible supercapacitor (so-called all-in-one supercapacitor). The boron cross-linked PVA/KCl hydrogel film (B-PVA/KCl) is prepared by simple physical and chemical cross-linking methods. Then, the conducting PPy is embedded in the B-PVA/KCl film by in situ growth to form a PPy/B-PVA/KCl composite film, which shows superior toughness and strength when it undergo large deformations, such as stretch, twist and compression. The integrated flexible supercapacitor can obtain a large areal capacitance of 224 mF cm–2 and a remarkable energy density of 20 μWh cm–2. Furthermore, such device exhibits excellent electrochemical stability under various bending angles (0°, 90°, and 180°) or 500 bending-releasing cycles, which due to the integrated electrode–electrolyte–electrode configuration can avoid the fall-off of electrode materials from the substrates and overcome the relative displacement between electrode and electrolyte layers during the consecutive bending cycles.
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