Synthesis and supercapacitance of flower-like Co(OH)2 hierarchical superstructures self-assembled by mesoporous nanobelts
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- 作者：Changzhou Yuan (1) ayuancz@163.com
Long Yang (1)
Linrui Hou (1)
Diankai Li (1)
Laifa Shen (2)
Fang Zhang (2)
Xiaogang Zhang (2) azhangxg@163.com - 关键词：Co(OH)2 – ; Hierarchical superstructures – ; Flower ; like microspheres – ; Electrochemical capacitors
- 刊名：Journal of Solid State Electrochemistry
- 出版时间：April 2012
- 出版年：2012
- 期刊代码：79_1432-8488
- 类别：ch
- 卷：16
- 期：4
- 页码：1519-1525
- 数据来源：sp
摘要
A facile hydrothermal strategy was first proposed to synthesize flower-like Co(OH)2 hierarchical microspheres. Further physical characterizations revealed that the flower-like Co(OH)2 microspherical superstructures were self-assembled by one-dimension nanobelts with rich mesopores. Electrochemical performance of the flower-like Co(OH)2 hierarchical superstructures were investigated by cyclic voltammgoram, galvanostatic charge–discharge and electrochemical impedance spectroscopy in 3 M KOH aqueous electrolyte. Electrochemical data indicated that the flower-like Co(OH)2 superstructures delivered a specific capacitance of 434 F g−1 at 10 mA cm−2 (about 1.33 A g−1), and even kept it as high as 365 F g−1 at about 5.33 A g−1. Furthermore, the SC degradation of about 8%after 1,500 continuous charge–discharge cycles at 5.33 A g−1 demonstrates their good electrochemical stability at large current densities.