Jump to main content
Jump to site search

Issue 8, 2014
Previous Article Next Article

Fabrication of a 3D MnO2/graphene hydrogel for high-performance asymmetric supercapacitors

Author affiliations

Abstract

A three-dimensional hydrogel of graphene and MnO2 nanoparticles has been prepared by a two-step synthesis. At first, nanoparticles of MnO2 were grown onto both surfaces of nanosheets of graphene oxide with the aid of benzyl alcohol in an aqueous suspension, and then the composite hydrogel of reduced graphene oxide (rGO) and MnO2 was prepared by a reduction-induced in situ self-assembly. Then, asymmetric supercapacitors with high energy and power densities were fabricated using the MnO2/rGO hydrogel as the positive electrode and a pure rGO hydrogel as the negative electrode in a neutral aqueous Na2SO4 (1.0 M) electrolyte. The asymmetric supercapacitor exhibited a high performance with an energy density of 21.2 W h kg−1 and a power density of 0.82 kW kg−1, and it can be cycled reversibly in a wide potential window of 1.6 V (0–1.6 V). The asymmetric supercapacitor also exhibited stable cycling performance with 89.6% capacitance after 1000 cycles. This work provides a new method for the preparation of a metal oxide/graphene hydrogel-based asymmetric supercapacitor free of polymer binders and conducting additives.

Graphical abstract: Fabrication of a 3D MnO2/graphene hydrogel for high-performance asymmetric supercapacitors

Back to tab navigation

Publication details

The article was received on 29 Oct 2013, accepted on 20 Nov 2013 and first published on 25 Nov 2013


Article type: Paper
DOI: 10.1039/C3TA14387B
Citation: J. Mater. Chem. A, 2014,2, 2765-2772
  •   Request permissions

    Fabrication of a 3D MnO2/graphene hydrogel for high-performance asymmetric supercapacitors

    S. Wu, W. Chen and L. Yan, J. Mater. Chem. A, 2014, 2, 2765
    DOI: 10.1039/C3TA14387B

Search articles by author

Spotlight

Advertisements