Abstract
Three-dimensional (3D) hierarchical porous flower-like nickel–cobalt oxide/multi-walled carbon nanotubes (Ni–Co oxide/MWCNTs) nanocomposites were fabricated by a facile and template-free hydrothermal method as electrodes for high-capacity supercapacitors. The samples were characterized by energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption–desorption and thermal gravimetric analysis (TGA). The electrochemical performance was investigated by cyclic voltammetry (CV), galvanostatic charge–discharge, and cycle life. It was found that Ni–Co oxide/MWCNTs nanocomposites displayed a high specific capacitance (1703Fg−1 at a discharge current density of 1Ag−1) and, additionally, an excellent cycling performance, retaining 97% of the maximum capacitance after 2000cycles at 10Ag−1. Even at a high current density (20Ag−1), the specific capacitance was still up to 1309Fg−1. This outstanding capacitive performance may be attributed to the ideal composition of the material and to its unique 3D hierarchical porous flower-like architecture.
Published Version
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