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In-situ encapsulate Fe3O4 nanosheet arrays with graphene layers as anode for high-performance asymmetric supercapacitors

Abstract

The energy density of the asymmetric supercapacitors (ASCs) is greatly limited by the electrochemical performance of anode materials, especially the low specific capacitance and poor cycling stability. To achieve the high-performance ASCs, here we design and synthesize a new anode material of Fe3O4 nanosheet arrays, which are in situ encapsulated by graphene layers (G@Fe3O4) through plasma enhanced chemical vapor deposition. Vertical-standing G@Fe3O4 nanosheet arrays directly on the conductive substrates could facilitate electrolyte diffusion and reduce the internal resistance. Further, highly conductive graphene layers in situ capsulated on Fe3O4 nanosheets could not only provide fast ion and electron transport pathways, but also maintain a stable structure for G@Fe3O4. As for electrodes, G@Fe3O4 exhibits the higher capacitance up to 732 F g-1, better rate capability and cycling stability, when comparing with pristine Fe3O4. Further, an asymmetric supercapacitor device using G@Fe3O4 as anode and CuCo2O4 as cathode shows a high energy density up to 82.8 Wh kg-1 at the power density of 2047 W kg-1, and good cycling stability (88.3 % capacitance after 10000 cycles).

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Publication details

The article was received on 30 Aug 2017, accepted on 03 Oct 2017 and first published on 06 Oct 2017


Article type: Communication
DOI: 10.1039/C7TA07628B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    In-situ encapsulate Fe3O4 nanosheet arrays with graphene layers as anode for high-performance asymmetric supercapacitors

    J. H. Lin, H. Liang, H. N. Jia, S. L. Chen, J. Guo, J. L. Qi, C. Q. Qu, J. Cao, W. D. Fei and J. C. Feng, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07628B

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