Asymmetric supercapacitors based on carbon nanotubes@NiO ultrathin nanosheets core-shell composites and MOF-derived porous carbon polyhedrons with super-long cycle life
Asymmetric supercapacitors based on carbon nanotubes@NiO ultrathin nanosheets core-shell composites and MOF-derived porous carbon polyhedrons with super-long cycle life
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基于碳纳米管@NiO超薄纳米片核壳复合材料和MOF衍生的多孔碳多面体的非对称超级电容器具有超长的循环寿命
DOI：
10.1016/j.jpowsour.2015.03.106
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发表时间：
2015-07-01
影响因子：
9.2
通讯作者：
Wang, Xuefeng
中科院分区：
文献类型：
--
作者：
Yi, Huan;Wang, Huanwen;Wang, Xuefeng
基于水电解质的非对称超级电容器（ASC）最近因其工作电压和高离子电导率而引起了越来越多的关注。在此，我们开发了一种新型ASC，以碳纳米管@氧化镍纳米片（CNT@NiO）核壳复合材料为正极，多孔碳多面体（PCP）为负极，以KOH水溶液为电解质。 CNT@NiO核壳杂化物是通过简单的化学浴沉积方法和热退火制备的，而PCP是通过直接碳化锌基金属有机框架（MOF）获得的。由于其独特的微观结构，在三电极配置中实现了出色的电化学性能，例如，CNT@NiO电极在0-0.5 V窗口内在1 A g(-1)下达到996 F g(-1)，在20 A g(-1)下达到500 F g(-1)，在-1 -0 V窗口内PCPs电极在1 A g(-1)下达到245 F g(-1)。由于这些优点，所制造的CNT@NiO//PCPs ASC在400 W kg(-1)的功率密度下表现出25.4 Wh kg(-1)的最大能量密度，甚至在0-1.6 V的宽电压范围内在16,000 W kg-1（4.4 s内完全充电-放电）时保持9.8 Wh kg(-1)。 CNT@NiO//PCP5非对称超级电容器表现出超长的循环稳定性，10,000次循环后电容保持率为93%。 (C) 2015 Elsevier B.V. 保留所有权利。
Aqueous electrolyte based asymmetric supercapacitors (ASCs) has recently attracted increasing interest by virtue of their operation voltage and high ionic conductivity. Herein, we developed a novel ASC based on carbon nanotubes@nickel oxide nanosheets (CNT@NiO) core-shell composites as positive electrode and porous carbon polyhedrons (PCPs) as negative electrode in aqueous KOH solution as electrolyte. The CNT@NiO core-shell hybrids were prepared through a facile chemical bath deposition method followed by thermal annealing, while PCPs were obtained by direct carbonization of Zn-based metal-organic frameworks (MOFs). Owing to their unique microstructures, outstanding electrochemical properties have been achieved in three-electrode configuration, e.g., 996 F g(-1) at 1 A g(-1), 500 at 20 A g(-1) for the CNT@NiO electrode within 0-0.5 V window, and 245 F g(-1) at 1 A g(-1) for the PCPs electrode within -1 -0 V window. Resulting from these merits, the as-fabricated CNT@NiO//PCPs ASC exhibits maximum energy density of 25.4 Wh kg(-1) at a power density of 400 W kg(-1) and even remains 9.8 Wh kg(-1) at 16,000 W kg-1 (a full charge-discharge within 4.4 s) in the wide voltage region of 0-1.6 V. More importantly, the CNT@NiO//PCP5 asymmetric supercapacitor shows ultralong cycling stability, with 93% capacitance retention after 10,000 cycles. (C) 2015 Elsevier B.V. All rights reserved.