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Crystalline NiCo2S4 nanotube array coated with amorphous NiCoxSy for supercapacitor electrodes
Rui Ding1, Mingyi Zhang1, Yunhe Yao1
1Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, PR China.
Abstract:
Hierarchical NiCo2S4@NiCoxSy core/shell nanoarrays grown on carbon cloth were successfully synthesized via a two-step hydrothermal route and following an electrodeposition process. Compared with bare NiCo2S4, the electrochemical performance of NiCo2S4@NiCoxSy nanoarrays have been apparently improved, which shows areal capacitance as high as 3.9F/cm(2) at a constant current density of 1mA/cm(2). And the composite material exhibits excellent rate capability that a high areal capacitance of 2.9F/cm(2) is still retaining as the current density increase to 50mA/cm(2). The superior electrochemical performance can be attributed to the reasonably designed core/shell hierarchical structure of NiCo2S4@NiCoxSy nanoarrays, which would be promising for high-performance supercapacitor materials.
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