纳米针
材料科学
超级电容器
阳极
电化学
水平扫描速率
电流密度
功率密度
形态学(生物学)
储能
热液循环
纳米技术
纳米结构
镍
多孔性
化学工程
电极
复合材料
冶金
循环伏安法
物理化学
功率(物理)
化学
工程类
物理
生物
量子力学
遗传学
作者
Dezhi Kong,Jingshan Luo,Yanlong Wang,Weina Ren,Ting Yu,Yongsong Luo,Yaping Yang,Chuanwei Cheng
标识
DOI:10.1002/adfm.201304206
摘要
In this paper, a highly ordered three‐dimensional Co 3 O 4 @MnO 2 hierarchical porous nanoneedle array on nickel foam is fabricated by a facile, stepwise hydrothermal approach. The morphologies evolution of Co 3 O 4 and Co 3 O 4 @MnO 2 nanostructures upon reaction times and growth temperature are investigated in detail. Moreover, the as‐prepared Co 3 O 4 @MnO 2 hierarchical structures are investigated as anodes for both supercapacitors and Li‐ion batteries. When used for supercapacitors, excellent electrochemical performances such as high specific capacitances of 932.8 F g −1 at a scan rate of 10 mV s −1 and 1693.2 F g −1 at a current density of 1 A g −1 as well as long‐term cycling stability and high energy density (66.2 W h kg −1 at a power density of 0.25 kW kg −1 ), which are better than that of the individual component of Co 3 O 4 nanoneedles and MnO 2 nanosheets, are obtained. The Co 3 O 4 @MnO 2 NAs are also tested as anode material for LIBs for the first time, which presents an improved performance with high reversible capacity of 1060 mA h g −1 at a rate of 120 mA g −1 , good cycling stability, and rate capability.
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