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首页> 外文期刊>Advanced Functional Materials >Asymmetric Supercapacitors Based on Graphene/MnO_2 Nanospheres and Graphene/MoO_3 Nanosheets with High Energy Density
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Asymmetric Supercapacitors Based on Graphene/MnO_2 Nanospheres and Graphene/MoO_3 Nanosheets with High Energy Density

机译：基于石墨烯/ MnO_2纳米球和石墨烯/ MoO_3纳米片的高能量密度不对称超级电容器

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摘要

Asymmetric supercapacitors with high energy density are fabricated using a self-assembled reduced graphene oxide (RCO)/MnO_2 (GrMnO_2) composite as a positive electrode and a RGO/MoO_3 (GrMoO_3) composite as a negative electrode in safe aqueous Na_2SO_4 electrolyte. The operation voltage is maximized by choosing two metal oxides with the largest work function difference. Because of the synergistic effects of highly conductive graphene and highly pseudocapacitive metal oxides, the hybrid nanostructure electrodes exhibit better charge transport and cycling stability. The operation voltage is expanded to 2.0 V in spite of the use of aqueous electrolyte, revealing a high energy density of 42.6 Wh kg~(-1) at a power density of 276 W kg(-1) and a maximum specific capacitance of 307 F g~(-1) consequently giving rise to an excellent Ragone plot. In addition, the GrMnO_2//GrMoO_3 supercapacitor exhibits improved capacitance with cycling up to 1000 cycles, which is explained by the development of micropore structures during the repetition of ion transfer. This strategy for the choice of metal oxides provides a promising route for next-generation supercapacitors with high energy and high power densities.
机译：在安全的Na_2SO_4水溶液中，使用自组装的还原氧化石墨烯（RCO）/ MnO_2（GrMnO_2）复合材料作为正电极和RGO / MoO_3（GrMoO_3）复合材料作为负电极，制备了具有高能量密度的不对称超级电容器。通过选择两种功函数差异最大的金属氧化物，可以使工作电压最大化。由于高导电石墨烯和高拟电容金属氧化物的协同效应，杂化纳米结构电极表现出更好的电荷传输和循环稳定性。尽管使用了水性电解质，工作电压仍可扩展至2.0 V，在276 W kg（-1）的功率密度和307的最大比电容下显示出42.6 Wh kg〜（-1）的高能量密度因此，F g〜（-1）产生极好的Ragone图。此外，GrMnO_2 // GrMoO_3超级电容器在循环高达1000次循环后表现出更高的电容，这可以通过重复离子转移过程中微孔结构的发展来解释。这种选择金属氧化物的策略为具有高能量和高功率密度的下一代超级电容器提供了一条有希望的途径。

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  • 来源
    《Advanced Functional Materials》 |2013年第40期|5074-5083|共10页
  • 作者

    Jian Chang; Meihuajin; Fei Yao; Tae Hyung Kim; Viet Thong Le; Hongyan YueFethullah Gunes; Bing Li; Arunabha Ghosh; Sishen Xie; Young Hee Lee;

  • 作者单位

    IBS Center for Integrated Nanostmcture Physics Institute for Basic Science (IBS) Daejon, 305-701, Republic of Korea,Department of Energy Science Department of Physics Sungkyunkwan University Suwon, 440-746, Republic of Korea;

    IBS Center for Integrated Nanostmcture Physics Institute for Basic Science (IBS) Daejon, 305-701, Republic of Korea,Department of Energy Science Department of Physics Sungkyunkwan University Suwon, 440-746, Republic of Korea,National Center for Nanoscience and Technology Beijing, 100190, PR China;

    IBS Center for Integrated Nanostmcture Physics Institute for Basic Science (IBS) Daejon, 305-701, Republic of Korea,Department of Energy Science Department of Physics Sungkyunkwan University Suwon, 440-746, Republic of Korea;

    IBS Center for Integrated Nanostmcture Physics Institute for Basic Science (IBS) Daejon, 305-701, Republic of Korea,Department of Energy Science Department of Physics Sungkyunkwan University Suwon, 440-746, Republic of Korea;

    IBS Center for Integrated Nanostmcture Physics Institute for Basic Science (IBS) Daejon, 305-701, Republic of Korea,Department of Energy Science Department of Physics Sungkyunkwan University Suwon, 440-746, Republic of Korea;

    IBS Center for Integrated Nanostmcture Physics Institute for Basic Science (IBS) Daejon, 305-701, Republic of Korea,Department of Energy Science Department of Physics Sungkyunkwan University Suwon, 440-746, Republic of Korea,School of Materials Science and Engineering Harbin University of Science and Technology Harbin, 150040, PR China;

    IBS Center for Integrated Nanostmcture Physics Institute for Basic Science (IBS) Daejon, 305-701, Republic of Korea,Department of Energy Science Department of Physics Sungkyunkwan University Suwon, 440-746, Republic of Korea;

    IBS Center for Integrated Nanostmcture Physics Institute for Basic Science (IBS) Daejon, 305-701, Republic of Korea,Department of Energy Science Department of Physics Sungkyunkwan University Suwon, 440-746, Republic of Korea;

    IBS Center for Integrated Nanostmcture Physics Institute for Basic Science (IBS) Daejon, 305-701, Republic of Korea,Department of Energy Science Department of Physics Sungkyunkwan University Suwon, 440-746, Republic of Korea,Department of Energy Science Sungkyunkwan University Suwon, 440-746, Korea,Institute of Physics Chinese Academy of Sciences Beiiine. 100190, PR China;

    IBS Center for Integrated Nanostmcture Physics Institute for Basic Science (IBS) Daejon, 305-701, Republic of Korea,Department of Energy Science Department of Physics Sungkyunkwan University Suwon, 440-746, Republic of Korea;

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