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Issue 2, 2017
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Flexible high-energy asymmetric supercapacitors based on MnO@C composite nanosheet electrodes

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Abstract

Developing asymmetric supercapacitors (ASCs) is a promising alternative to achieve both wide voltage windows and high energy densities to meet the application requirements of hybrid vehicles and renewable energy systems. However, a major limitation of high performance asymmetric supercapacitors lies in negative electrode materials which possess relatively low specific capacitance compared to positive electrode materials. Herein, a novel MnO@C composite nanosheet array directly grown on conductive carbon cloth as a negative electrode is prepared successfully, which exhibits a large specific capacitance of 662.9 F g−1 at a current density of 3.7 A g−1 and an areal capacitance of 716 mF cm−2 at a current density of 4 mA cm−2. Afterward, a flexible ASC is successfully assembled with Co3O4 nanosheets and MnO@C nanosheets as the positive electrode and negative electrode, respectively. The optimized ASC achieves a high operating voltage of 1.7 V and displays intriguing performances with a high specific capacitance of 166 F g−1, an exceptional energy density of 59.6 W h kg−1 and superior rate capability and cycling stability. In addition, the ASC exhibits superior flexibility and mechanical stability even under severe bending states. The ASC based on MnO@C nanosheets as a promising candidate for high performance supercapacitors may pave the way for applications in high performance energy storage systems.

Graphical abstract: Flexible high-energy asymmetric supercapacitors based on MnO@C composite nanosheet electrodes

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Publication details

The article was received on 26 Sep 2016, accepted on 30 Nov 2016 and first published on 30 Nov 2016


Article type: Paper
DOI: 10.1039/C6TA08330G
Citation: J. Mater. Chem. A, 2017,5, 804-813
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    Flexible high-energy asymmetric supercapacitors based on MnO@C composite nanosheet electrodes

    N. Yu, K. Guo, W. Zhang, X. Wang and M. Zhu, J. Mater. Chem. A, 2017, 5, 804
    DOI: 10.1039/C6TA08330G

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