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Facile synthesis of hierarchical mesoporous beta-manganese dioxide nanoflowers with extremely high specific surface areas for high-performance electrochemical capacitors.

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Title: Facile synthesis of hierarchical mesoporous beta-manganese dioxide nanoflowers with extremely high specific surface areas for high-performance electrochemical capacitors.
Authors: Li, Rong-Bing1, Yu, Li-Li1 lly522@shu.edu.cn, Li, Shuang1, Fan, Jun1, Luo, Rong1, Zhao, Jing-Tai1,2 jtzhao@shu.edu.cn
Source: Electrochimica Acta. Sep2018, Vol. 284, p52-59. 8p.
Subjects: Nanorods, Surface area, Current density (Electromagnetism), Biochemical substrates, Supercapacitors, Manganese dioxide
Abstract: Ultrathin nanorods self-assembled porous nanoflowers to form hierarchical mesoporous beta -manganese dioxide (β-MnO 2 ) with extremely high specific surface areas of >400 m 2  g −1 are fabricated in high yield at room temperature in a simple 1,2-butanediol/KMnO 4 system. As supercapacitor electrodes, specific capacitances of as-prepared β-MnO 2 nanoflowers can reach 500-430 F g −1 at a current density of 0.1 A g −1 in 0.5 M Na 2 SO 4 aqueous electrolytes. And greatly enhanced rate capability of 66.4% at 20 A g −1 with a good cycling stability of 95.5% (10 A g −1 , after 5000 cycles) is obtained by reducing the particle size of β-MnO 2 nanoflowers with well-defined morphologies, which can be achieved by regulating the molar ratios of the reactants. In view of its easy preparation, the as-prepared β-MnO 2 is considered as a promising candidate for high-performance supercapacitor electrode material. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Ultrathin nanorods self-assembled porous nanoflowers to form hierarchical mesoporous beta -manganese dioxide (β-MnO 2 ) with extremely high specific surface areas of >400 m 2  g −1 are fabricated in high yield at room temperature in a simple 1,2-butanediol/KMnO 4 system. As supercapacitor electrodes, specific capacitances of as-prepared β-MnO 2 nanoflowers can reach 500-430 F g −1 at a current density of 0.1 A g −1 in 0.5 M Na 2 SO 4 aqueous electrolytes. And greatly enhanced rate capability of 66.4% at 20 A g −1 with a good cycling stability of 95.5% (10 A g −1 , after 5000 cycles) is obtained by reducing the particle size of β-MnO 2 nanoflowers with well-defined morphologies, which can be achieved by regulating the molar ratios of the reactants. In view of its easy preparation, the as-prepared β-MnO 2 is considered as a promising candidate for high-performance supercapacitor electrode material. [ABSTRACT FROM AUTHOR]
ISSN:00134686
DOI:10.1016/j.electacta.2018.07.172