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Issue 38, 2015
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Advanced asymmetric supercapacitors based on CNT@Ni(OH)2 core–shell composites and 3D graphene networks

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Abstract

Asymmetric supercapacitors (ASCs) with carbon nanotube@nickel hydroxide nanosheet (CNT@Ni(OH)2) core–shell composites as positive electrodes and three-dimensional (3D) graphene networks (3DGNs) as negative electrodes were reported in aqueous KOH electrolyte. The CNT@Ni(OH)2 core–shell composites were prepared through a facile chemical bath deposition method, while 3DGNs were obtained by freeze-drying of graphene hydrogels. By virtue of their unique microstructures, superb electrochemical properties were achieved in a three-electrode system, e.g., 1136 F g−1 at 2 A g−1 for the CNT@Ni(OH)2 electrode within 0–0.5 V and 203 F g−1 at 1 A g−1 for the 3DGN electrode within −1–0 V. Benefiting from these merits, the as-fabricated CNT@Ni(OH)2//3DGN ASC showed a maximum energy density of 44.0 W h kg−1 at a power density of 800 W kg−1 and even retained 19.6 W h kg−1 at 16 000 W kg−1 in the voltage region of 0–1.6 V.

Graphical abstract: Advanced asymmetric supercapacitors based on CNT@Ni(OH)2 core–shell composites and 3D graphene networks

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Publication details

The article was received on 07 Aug 2015, accepted on 17 Aug 2015 and first published on 17 Aug 2015


Article type: Paper
DOI: 10.1039/C5TA06174A
Citation: J. Mater. Chem. A, 2015,3, 19545-19555
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    Advanced asymmetric supercapacitors based on CNT@Ni(OH)2 core–shell composites and 3D graphene networks

    H. Yi, H. Wang, Y. Jing, T. Peng, Y. Wang, J. Guo, Q. He, Z. Guo and X. Wang, J. Mater. Chem. A, 2015, 3, 19545
    DOI: 10.1039/C5TA06174A

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