超级电容器
材料科学
碳纳米管
电容
电极
纳米技术
化学工程
多孔性
功率密度
复合材料
电导率
法拉第效率
碳纤维
电化学
储能
复合数
功率(物理)
物理
工程类
物理化学
量子力学
化学
作者
Yazhi Liu,Gaoran Li,Yi Guo,Yibin Ying,Xinsheng Peng
标识
DOI:10.1021/acsami.7b03368
摘要
Rational design of free-standing porous carbon materials with large specific surface area and high conductivity is a great need for ligh-weight suprecapacitors. Here, we report a flexible porous carbon film composed of metal-organic framework (MOF)-derived porous carbon polyhedrons and carbon nanotubes (CNTs) as binder-free supercapacitor electrode for the first time. Due to the synergistic combination of carbon polyhedrons and CNT, the obtained carbon electrode shows a specific capacitance of 381.2 F g-1 at 5 mV s-1 and 194.8 F g-1 at 2 A g-1 and outstanding cycling stability with a Coulombic effciency above 95% after 10000 cycles at 10 A g-1. The assembled aqueous symmetrical supercapacitor exhibits an energy density of 9.1 Wh kg-1 with a power density of 3500 W kg-1. The work opens a new way to design flexible MOF-based hierarchical porous carbon film as binder-free electrodes for high-performance energy storage devices.
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