聚酰亚胺
超级电容器
电容
碳化
材料科学
复合材料
电极
原位聚合
聚合
复合数
电化学
聚合物
化学
图层(电子)
物理化学
扫描电子显微镜
作者
Yongqi Wang,Yunhua Lu,Zhizhi Hu,Sun Jia,Guoyong Xiao,Hongbin Zhao,Jianmin Zhu,Zhaobin Liu
标识
DOI:10.1016/j.elecom.2023.107449
摘要
Herein, we propose an effective strategy for preparing [email protected] composite electrodes. First, the UiO-66 crystals are synthesized and introduced into polyimide (PI) by in-situ polymerization and thermal imidization to fabricate composite films. After carbonization, the [email protected] composites are obtained, and the influences of UiO-66 content and carbonization temperature on the structures and electrochemical behaviors are investigated. After optimization, the specific capacitance of the PI/5%UiO-66–800 reaches a maximum of 345F/g at 0.5 A/g, superior to corresponding PI matrix and UiO-66 crystals. As the current density gradually increases to 10 A/g, the specific capacitance drops to 252F/g with a retention of 73 %. Additionally, the PI/5%UiO-66–800 composites are assembled into symmetric supercapacitors, which show a favorable specific capacitance of 271.2 F/g and an outstanding cycling stability about 99 % after 10,000 charge–discharge cycles. Furthermore, the supercapacitor device has delivered a high specific energy of 37.67 Wh kg−1 with a specific power of 500 W kg−1. Moreover, only one coin cell can successfully power a LED, suggesting its promising potential as an alternative electrode material for high-performance supercapacitor applications. Thus, this study demonstrates a simple way to boost capacitive performances of [email protected] composite electrodes for power sources.
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