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Controllable Synthesis of MnO2 Nanostructure Anchored on Graphite Foam with Different Morphology for High-Performance Asymmetric Supercapacitor

Abstract

MnO2 nanostructure with different morphologies (nanowires, nanowire bundles and flower-like nanosheets bundles) were synthesized by adjusting the concentration of KMnO4 solution using a simple and surfactant-free hydrothermal method. Both MnO2 nanowires and nanosheets have ultrathin thickness of about 10-30 nanometers. Such ‘open’ nanostructure can facilitate the electrolyte infiltration and increase the active materials utilization efficiency. Owing to the high electron conductivity of graphene/Ni foam (GNF) substrate as well as the large electrolyte/electrode contact interface, a specific capacitance of 201 F g-1 can be obtained in 1 M Na2SO4 electrolyte. An asymmetric supercapacitor assembled with flower-like MnO2 nanosheet bundles on GNF and activated microwave exfoliated graphite oxide (a-MEGO) yields an energy density of 44.5 Wh kg-1 and a power density of 50.0 kW kg-1, respectively. The unique and controllable MnO2 nanostructures may have enormous potential applications in the field of energy storage and sensor.

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Publication details

The article was received on 06 Dec 2017, accepted on 08 Feb 2018 and first published on 08 Feb 2018


Article type: Paper
DOI: 10.1039/C7CE02108A
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Controllable Synthesis of MnO2 Nanostructure Anchored on Graphite Foam with Different Morphology for High-Performance Asymmetric Supercapacitor

    X. Lv, H. Zhang, F. Wang, Z. Hu, Y. Zhang, L. L. Zhang, R. Xie and J. Ji, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C7CE02108A

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