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Indexed by:期刊论文

Date of Publication:2017-03-01

Journal:RESEARCH ON CHEMICAL INTERMEDIATES

Included Journals:SCIE、EI

Volume:43

Issue:3

Page Number:1969-1978

ISSN No.:0922-6168

Key Words:Co0.85Se nanotube arrays; Binder-free electrode; Supercapacitors; Electrochemical performance

Abstract: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.