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首页> 外文期刊>Advanced Functional Materials >Asymmetric Supercapacitors Based on Graphene/MnO_2 and Activated Carbon Nanofiber Electrodes with High Power and Energy Density
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Asymmetric Supercapacitors Based on Graphene/MnO_2 and Activated Carbon Nanofiber Electrodes with High Power and Energy Density

机译：基于石墨烯/ MnO_2和高功率高能量密度活性炭纳米纤维电极的不对称超级电容器

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摘要

Asymmetric supercapacitor with high energy density has been developed successfully using graphene/MnO_2 composite as positive electrode and activated carbon nanofibers (ACN) as negative electrode in a neutral aqueous Na_2SO_4 electrolyte. Due to the high capacitances and excellent rate performances of graphene/MnO_2 and ACN, as well as the synergistic effects of the two electrodes, such asymmetric cell exhibits superior electrochemical performances. An optimized asymmetric supercapacitor can be cycled reversibly in the voltage range of 0-1.8 V, and exhibits maximum energy density of 51.1 Wh kg which is much higher than that of MnO_2// DWNT cell (29.1 Wh kg~(-1)). Additionally, graphene/MnO_2//ACN asymmetric supercapacitor exhibits excellent cycling durability, with 97% specific capacitance retained even after 1000 cycles. These encouraging results show great potential in developing energy storage devices with high energy and power densities for practical applications.
机译：以石墨烯/ MnO_2复合材料为正极，以活性碳纳米纤维（ACN）为负极，在中性Na_2SO_4水溶液中成功开发了具有高能量密度的不对称超级电容器。由于石墨烯/ MnO_2和ACN的高电容和出色的倍率性能，以及两个电极的协同作用，这种不对称电池表现出优异的电化学性能。优化的不对称超级电容器可以在0-1.8 V的电压范围内可逆循环，并具有5​​1.1 Wh kg的最大能量密度，远高于MnO_2 // DWNT电池（29.1 Wh kg〜（-1））。此外，石墨烯/ MnO_2 // ACN不对称超级电容器表现出出色的循环耐久性，即使在1000次循环后仍可保留97％的比电容。这些令人鼓舞的结果表明，在开发用于实际应用的高能量和功率密度的储能设备方面具有巨大潜力。

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  • 来源
    《Advanced Functional Materials》 |2011年第12期|p.2366-2375|共10页
  • 作者

    Zhuangjun Fan; Jun Yan; Tong Wei; Linjie Zhi; Guoqing Ning; Tianyou Li; Fei Wei;

  • 作者单位

    College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001, P. R.China;

    College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001, P. R.China;

    College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001, P. R.China;

    Zhongguancun, Beiy/tiao 11, Beijing 100190, P. R. China;

    China University of Petroleum Beijing 102249, P. R.China;

    College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001, P. R.China;

    Department of Chemical Engineering Tsinghua University Beijing 100084, P. R.China;

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