期刊
ADVANCED FUNCTIONAL MATERIALS
卷 22, 期 12, 页码 2632-2641出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201102839
关键词
energy density; graphene; hierarchical structures; nickel hydroxide; supercapacitors
类别
资金
- National Science Foundation of China [51077014, 21003028]
- China Postdoctoral Science Foundation [20100480058, 201104411]
- Heilongjiang Postdoctoral Foundation [LBH-Z10205]
- Fundamental Research funds for the Central Universities
- Program for New Century Excellent Talents in University [NCET-10-0050]
Hierarchical flowerlike nickel hydroxide decorated on graphene sheets has been prepared by a facile and cost-effective microwave-assisted method. In order to achieve high energy and power densities, a high-voltage asymmetric supercapacitor is successfully fabricated using Ni(OH)2/graphene and porous graphene as the positive and negative electrodes, respectively. Because of their unique structure, both of these materials exhibit excellent electrochemical performances. The optimized asymmetric supercapacitor could be cycled reversibly in the high-voltage region of 01.6 V and displays intriguing performances with a maximum specific capacitance of 218.4 F g-1 and high energy density of 77.8 Wh kg-1. Furthermore, the Ni(OH)2/graphene//porous graphene supercapacitor device exhibits an excellent long cycle life along with 94.3% specific capacitance retained after 3000 cycles. These fascinating performances can be attributed to the high capacitance and the positive synergistic effects of the two electrodes. The impressive results presented here may pave the way for promising applications in high energy density storage systems.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据