Hierarchical composite electrodes of nickel oxide nanoflake 3D graphene for high-performance pseudocapacitors

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Chundong Wang
  • Junling Xu
  • Muk-Fung Yuen
  • Jie Zhang
  • Xianfeng Chen

Detail(s)

Original languageEnglish
Pages (from-to)6372-6380
Journal / PublicationAdvanced Functional Materials
Volume24
Issue number40
Online published14 Aug 2014
Publication statusPublished - 29 Oct 2014

Abstract

NiO nanoflakes are created with a simple hydrothermal method on 3D (three-dimensional) graphene scaffolds grown on Ni foams by microwave plasma enhanced chemical vapor deposition (MPCVD). Such as-grown NiO-3D graphene hierarchical composites are then applied as monolithic electrodes for a pseudo-supercapacitor application without needing binders or metalbased current collectors. Electrochemical measurements impart that the hierarchical NiO-3D graphene composite delivers a high specific capacitance of ≈1829 F g-1 at a current density of 3 A g-1 (the theoretical capacitance of NiO is 2584 F g-1). Furthermore, a full-cell is realized with an energy density of 138 Wh kg-1 at a power density of 5.25 kW kg-1, which is much superior to commercial ones as well as reported devices in asymmetric capacitors of NiO. More attractively, this asymmetric supercapacitor exhibits capacitance retention of 85% after 5000 cycles relative to the initial value of the 1st cycle.

Citation Format(s)

Hierarchical composite electrodes of nickel oxide nanoflake 3D graphene for high-performance pseudocapacitors. / Wang, Chundong; Xu, Junling; Yuen, Muk-Fung; Zhang, Jie; Li, Yangyang; Chen, Xianfeng; Zhang, Wenjun.

In: Advanced Functional Materials, Vol. 24, No. 40, 29.10.2014, p. 6372-6380.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal