Micro-Flower NiCoMnO2 Superstructures Prepared by a Catalytic Chemical Oxidation for Supercapacitor Applications

Herein, a facile method of catalytic chemical oxidation was reported to produce the micro-flower NiCoMnO2 superstructures. FE-SEM confirmed the uniform NiCoMnO2 flower-like morphologies with an averaged diameter of 1−2 μm, composed of the nanosheets with the thickness of 10 ± 2 nm, could provide the pathways for efficient and fast transport of both electrolyte ions and electrons due to higher electroactive surface areas and enhanced electrical conductivity. As an anode material, nanorod-like β-FeOOH with the average diameter of 139 ± 30 nm and the length of 796 ± 140 nm was obtained by a hydrothermal method. The NiCoMnO2 and β-FeOOH electrode materials showed the good electrochemical performance with maximum specific capacitances of 726 F g-1 and 276 F g-1 at 1 A g-1, respectively. Furthermore, the fabricated asymmetric supercapacitor (ASC) NiCoMnO2//β-FeOOH device exhibited excellent specific capacitance of 110 F g-1 at 1 A g-1, cycle stability of 84.5% after 2000 charge/discharge cycles and high energy density of 34.38 Wh kg-1 at the power density of 750 W kg-1.

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Micro-Flower NiCoMnO2 Superstructures Prepared by a Catalytic Chemical Oxidation for Supercapacitor Applications

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