Direct growth of bundle-like cobalt selenide nanotube arrays on Ni foam as binder-free electrode for high-performance supercapacitors
详细信息 查看全文
- 作者：Peng Sun ; Ji-Cai Liang ; Guang-Yi Chen ; Kai-Yuan Zhou…
- 关键词：Co0.85Se nanotube arrays ; Binder ; free electrode ; Supercapacitors ; Electrochemical performance
- 刊名：Research on Chemical Intermediates
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：43
- 期：3
- 页码：1969-1978
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Catalysis; Physical Chemistry; Inorganic Chemistry;
- 出版者：Springer Netherlands
- ISSN：1568-5675
- 卷排序：43
文摘
Freestanding bundle-like Co0.85Se nanotube arrays on nickle foam were prepared through a facile ion-exchange reaction and directly used as electrodes for supercapacitors. The morphology and structure of the obtained Co0.85Se nanotube arrays were studied by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and selected-area electron diffraction (SAED). The electrochemical properties of the obtained Co0.85Se electrodes were studied by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) analysis, and electrochemical impedance spectroscopy (EIS) in a three-electrode system. The Co0.85Se nanotube array/Ni foam electrode exhibited remarkable pseudocapacitive performance with high specific capacitance (1394 F g−1 at 4 A g−1) as well as good cycling performance and rate capability. The good electrochemical properties were due to the hollow nanostructure of the bundle-like Co0.85Se nanotube arrays and the three-dimensional (3D) conductive Ni foam, which can increase the contact between electrode and electrolyte and improve the conductivity of the whole electrode.