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Preparation and electrochemical performances of NiCo2O4@NiCo2O4 composite of nanoplates for high performances supercapacitor applications

Abstract

Currently, enormous attention was paid to the perverse design and synthesis of hierarchical nanosheet structures for high-performance supercapacitor. In the present study, we have explored electrochemically synthesized nanostructured of free standing NiCo2O4@NiCo2O4 composite electrode interconnected hierarchical nanoplate and NiCo2O4 connected hierarchical nanowires were directly grown on highly conductivity Ni foam substrate as electrode for supercapacitor applications through a cost effective and simple chemical bath deposition method. Electrochemical properties were investigated by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. These optimized NiCo2O4@NiCo2O4 electrode delivered an remarkable specific capacitance 2800 F/g at a current density of 35 mA cm-2 which is higher than that of the NiCo2O4 electrode (1200 F/g at 35 mA cm-2) in 3M KOH aqueous solution with good electrochemical superior cycling life properties because of its higher conductivity, broad surface area and mesopores on its walls. The NiCo2O4@NiCo2O4 composite electrode are directly grown on highly conductivity Ni foam substrate of NiCo2O4 nanowires for an efficient electrocatalytic oxidation reaction. The mesopores features of the NiCo2O4@NiCo2O4 electrode enhanced property are attributed to the fast electron/ion transfer and enhance the utilization of the electrode materials and large electroactive sites. All these results indicate NiCo2O4@NiCo2O4 composites electrode would be a promising positive electrode material for flexible electrochemical capacitor.

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Publication details

The article was received on 24 Oct 2018, accepted on 06 Nov 2018 and first published on 07 Nov 2018


Article type: Paper
DOI: 10.1039/C8NJ05401K
Citation: New J. Chem., 2018, Accepted Manuscript
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    Preparation and electrochemical performances of NiCo2O4@NiCo2O4 composite of nanoplates for high performances supercapacitor applications

    A. K. Yedluri and H. Kim, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ05401K

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