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Ultralayered Core-shell Metal Oxide Nanosheet Arrays for Supercapacitors With Long-term Electrochemical Stability

Abstract

High-stability electrodes are highly desirable for practical supercapacitor applications, which closely link with high utilization and degradation of active material. Herein, core/shell ultralayered Co3O4@NiO nanosheet arrays were developed by a two-step low temperature hydrothermal method. A porous and thin NiO shell is epitaxial grown on the surface of ultralayered Co3O4 nanosheet. As supercapacitor electrode material with good electrochemical performance, the prepared Co3O4@NiO core/shell nanosheet arrays electrode demonstrated a notably enhanced specific capacitance (715 F·g-1 at 0.5A·g-1) compared with the pure Co3O4 nanosheets. The elegant combination of NiO and Co3O4 nanostructures in the nanosheet arrays show a promising synergistic effect for capacitors with greatly enhanced performance (30.2 Wh·kg-1 at power density of 201.5 Wh·kg-1 ) and a good cycling stability with 102% of the initial capacitance after 6000 cycles. The as-prepared core/shell ultralayered Co3O4@NiO nanosheet arrays with enhanced performances could be considered as a promising electrode material for high -performance supercapacitors.

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Publication details

The article was accepted on 26 Jun 2018 and first published on 03 Jul 2018


Article type: Paper
DOI: 10.1039/C8SE00290H
Citation: Sustainable Energy Fuels, 2018, Accepted Manuscript
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    Ultralayered Core-shell Metal Oxide Nanosheet Arrays for Supercapacitors With Long-term Electrochemical Stability

    D. Han, Y. Shen, Z. Cheng, Y. Wei, G. Zeng and L. Mao, Sustainable Energy Fuels, 2018, Accepted Manuscript , DOI: 10.1039/C8SE00290H

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