Synthesis of Hierarchical Graphene-MnO2 Nanowire Composites with Enhanced Specific Capacitance

Synthesis of Hierarchical Graphene-MnO2 Nanowire Composites with Enhanced Specific Capacitance T. Veldevi Department of Chemistry, Vels Institute of Science Technology and Advanced Studies (VISTAS), Chennai-600117, India K. Thileep Kumar Department of Chemistry, Vels Institute of Science Technology and Advanced Studies (VISTAS), Chennai-600117, India R.A. Kalaivani Department of Chemistry, Vels Institute of Science Technology and Advanced Studies (VISTAS), Chennai-600117, India S. Raghu Department of Chemistry, Vels Institute of Science Technology and Advanced Studies (VISTAS), Chennai-600117, India; Centre for Energy and Alternative Fuels, Vels Institute of Science Technology and Advanced Studies (VISTAS), Chennai-600117, India A.M. Shanmugharaj Department of Chemistry, Vels Institute of Science Technology and Advanced Studies (VISTAS), Chennai-600117, India; Centre for Energy and Alternative Fuels, Vels Institute of Science Technology and Advanced Studies (VISTAS), Chennai-600117, India

Hierarchical nanostructured graphene–manganese dioxide nanowire (G-MnO2-NW) composites have been prepared by hydrothermal synthesis route using water/1-decanol as the medium. Synthesized materials were analyzed using various characterization tools to corroborate their chemical compositions, structure/morphology and surface area. Electrochemical measurements of the synthesized G-MnO2-NW electrode materials delivered the highest specific capacity (255 Fg-1), high rate capability and improved cycling stability at 0.5 Ag–1 in 1M sodium sulfate solution and this fact may be attributed to its high surface area and porosity. Moreover, synthesized G-MnO2-NW electrodes displayed better energy and power density, when compared to the MnO2-NW based electrodes.
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