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Issue 17, 2013
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High energy density asymmetric supercapacitors with a nickel oxide nanoflake cathode and a 3D reduced graphene oxide anode

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Abstract

Here we demonstrate a high energy density asymmetric supercapacitor with nickel oxide nanoflake arrays as the cathode and reduced graphene oxide as the anode. Nickel oxide nanoflake arrays were synthesized on a flexible carbon cloth substrate using a seed-mediated hydrothermal method. The reduced graphene oxide sheets were deposited on three-dimensional (3D) nickel foam by hydrothermal treatment of nickel foam in graphene oxide solution. The nanostructured electrodes provide a large effective surface area. The asymmetric supercapacitor device operates with a voltage of 1.7 V and achieved a remarkable areal capacitance of 248 mF cm−2 (specific capacitance of 50 F g−1) at a charge/discharge current density of 1 mA cm−2 and a maximum energy density of 39.9 W h kg−1 (based on the total mass of active materials of 5.0 mg). Furthermore, the device showed an excellent charge/discharge cycling performance in 1.0 M KOH electrolyte at a current density of 5 mA cm−2, with a capacitance retention of 95% after 3000 cycles.

Graphical abstract: High energy density asymmetric supercapacitors with a nickel oxide nanoflake cathode and a 3D reduced graphene oxide anode

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Publication details

The article was received on 24 May 2013, accepted on 26 Jun 2013 and first published on 01 Jul 2013


Article type: Paper
DOI: 10.1039/C3NR02710D
Citation: Nanoscale, 2013,5, 7984-7990
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    High energy density asymmetric supercapacitors with a nickel oxide nanoflake cathode and a 3D reduced graphene oxide anode

    F. Luan, G. Wang, Y. Ling, X. Lu, H. Wang, Y. Tong, X. Liu and Y. Li, Nanoscale, 2013, 5, 7984
    DOI: 10.1039/C3NR02710D

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