Jump to main content
Jump to site search

Issue 28, 2011
Previous Article Next Article

Design and synthesis of NiCo2O4–reduced graphene oxide composites for high performance supercapacitors

Author affiliations

Abstract

In the present work, we used charge-bearing nanosheets as building blocks to construct a binary composite composed of NiCo2O4 and reduced graphene oxide (RGO). Co–Ni hydroxides intercalated by p-aminobenzoate (PABA) ion and graphite oxide (GO) were exfoliated into positively charged hydroxide nanosheets and negatively charged graphene oxide nanosheets in water, respectively, and then these oppositely charged nanosheets were assembled to form heterostructured nanohybrids through electrostatic interactions. The subsequent thermal treatment led to the transformation of the hydroxide nanosheets into spinel NiCo2O4 and also to the reduction of graphene oxide. The as-obtained NiCo2O4–RGO composite exhibits an initial specific capacitance of 835 F g−1 at a specific current of 1 A g−1 and 615 F g−1 at 20 A g−1. More interestingly, the specific capacitance of the composite increases with cycling numbers, reaches 1050 F g−1 at 450 cycles and remains at 908 F g−1 (higher than the initial value) after 4000 cycles. The high specific capacitance, remarkable rate capability and excellent cycling ability of the composites mean that they show promise for application in supercapacitors. Comparison with the capacitive behavior of pure NiCo2O4 and NiCo2O4 mechanically mixed with RGO displays the importance of the self-assembly of the nanosheets in making a wide range of graphene-based composite materials for applications in electrochemical energy storage.

Graphical abstract: Design and synthesis of NiCo2O4–reduced graphene oxide composites for high performance supercapacitors

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Feb 2011, accepted on 27 Apr 2011 and first published on 20 Jun 2011


Article type: Paper
DOI: 10.1039/C1JM10758E
Citation: J. Mater. Chem., 2011,21, 10504-10511
  •   Request permissions

    Design and synthesis of NiCo2O4–reduced graphene oxide composites for high performance supercapacitors

    H. Wang, Z. Hu, Y. Chang, Y. Chen, H. Wu, Z. Zhang and Y. Yang, J. Mater. Chem., 2011, 21, 10504
    DOI: 10.1039/C1JM10758E

Search articles by author

Spotlight

Advertisements