超级电容器
材料科学
复合数
电容
纳米片
比表面积
金属氢氧化物
纳米技术
电流密度
氢氧化物
电化学
金属
碳纳米管
电极
纳米管
化学工程
复合材料
化学
冶金
有机化学
催化作用
工程类
物理化学
物理
量子力学
作者
Siru Chen,Liangcai Zhao,Wutao Wei,Yanqiang Li,Liwei Mi
标识
DOI:10.1016/j.jallcom.2020.154794
摘要
Designing porous materials with various nanoscales and dimensionalities is very significant for surface/interfacial interaction and mass transport, and are expected to improve the performance of materials. Herein, we first report the preparation of porous NiCo layered double hydroxide (NiCo LDH) nanotube by utilizing a metal organic framework (MOF) and MoO3 composite as a precursor. The NiCo LDH nanotube is composed of two-dimension (2D) nanosheet and a high specific surface area of 107 m2 g−1 is achieved. The unique structure of nanotube and high specific surface area can greatly improve the electrical conductivity and electroactive surface area of the material and also shorten the ion transport path, resulting in enhancement of electrochemical performance. When used as electrode material for supercapacitors, the NiCo LDH nanotube shows a high specific capacitance of 1386 F g−1 at a current density of 1 A g−1. Moreover, the asymmetric supercapacitor assembled by active carbon and the NiCo LDH nanotube shows a high capacitance of 94.3 F g−1 at 0.5 A g−1, an energy density of 118 Wh kg−1 at a power density of 108 W kg−1 and excellent stability without any loss in capacitance even after 10000 charge-discharge cycles, indicating that the NiCo LDH nanotube is a very promising supercapacitor electrode material.
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