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3D hierarchical MnO2 microspheres: a prospective material for high performance supercapacitors and lithium-ion batteries

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Abstract

3D hierarchical MnO2 microspheres with an ultrathin nanosheet structure and high specific surface area (184.32 m2 g−1) are synthesized by a rapid microwave heating method in just 10 minutes. In this work, an ionic electrolyte (EMIMBF4/DMF) based asymmetric supercapacitor device is successfully prepared by using 3D hierarchical MnO2 microspheres as the cathode and activated carbon as the anode material. The (EMIMBF4/DMF) electrolyte enables a significant enhancement in the potential windows of individual electrode materials and the asymmetric device which results in much improved electrochemical performance. The asymmetric device operates successfully within a potential window of 3.0 V and exhibits an outstanding energy density of 105 W h kg−1 at a power density of 1494 W kg−1 with good cycling life stability (20% loss after 6000 cycles) at a much higher current density of 6 A g−1. Moreover, 3D hierarchical MnO2 microspheres also exhibit an outstanding Li ion storage performance with a discharge capacity of 715 mA h g−1 even after 200 cycles at a current density of 300 mA g−1. The discharge capacity retention (78% @ the 2nd cycle) after 200 cycles at 300 mA g−1 is the highest amongst those of all the reported anode materials based on MnO2. High specific capacities and outstanding cyclability further indicate their strong potential as an anode material for lithium-ion batteries. The promising energy storage applications can be ascribed to the high specific surface area, mesoporous structure and ultrathin nanosheet building blocks of MnO2 microspheres.

Graphical abstract: 3D hierarchical MnO2 microspheres: a prospective material for high performance supercapacitors and lithium-ion batteries

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Publication details

The article was received on 03 Jul 2017, accepted on 18 Aug 2017 and first published on 21 Aug 2017


Article type: Paper
DOI: 10.1039/C7SE00317J
Citation: Sustainable Energy Fuels, 2017, Advance Article
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    3D hierarchical MnO2 microspheres: a prospective material for high performance supercapacitors and lithium-ion batteries

    S. Khalid, C. Cao, M. Naveed and W. Younas, Sustainable Energy Fuels, 2017, Advance Article , DOI: 10.1039/C7SE00317J

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