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Superior Micro-Supercapacitors Based on Graphene Quantum Dots

机译：基于石墨烯量子点的高级微型超级电容器

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摘要

Graphene quantum dots (GQDs) have attracted tremendous research interest due to the unique properties associated with both graphene and quantum dots. Here, a new application of CQDs as ideal electrode materials for supercapacitors is reported. To this end, a GQDs//GQDs symmetric micro-supercapacitor is prepared using a simple electro-deposition approach, and its electrochemical properties in aqueous electrolyte and ionic liquid electrolyte are systematically investigated. The results show that the as-made CQDs micro-supercapacitor has superior rate capability up to 1000 V s~(-1), excellent) power response with very short relaxation time constant (t_0= 103.6 μs in aqueous electrolyte and t_0 = 53.8 μs in ionic liquid electrolyte), and excellent cycle stability. Additionally, another GQDs//MnO_2 asymmetric supercapacitor is also built using MnO_2 nanoneedles as the positive electrode and CQDs as the negative electrode in aqueous electrolyte. Its specific capacitance and energy density are both two times higher than those of GQDs//GQDs symmetric micro-supercapacitor in the same electrolyte. The results presented here may pave the way for a new promising application of GQDs in micro-power suppliers and microenergy storage devices.
机译：石墨烯量子点（GQD）由于与石墨烯和量子点相关的独特特性而吸引了巨大的研究兴趣。在此，报道了CQD作为超级电容器理想电极材料的新应用。为此，使用简单的电沉积方法制备了GQDs // GQDs对称微型超级电容器，并系统地研究了其在水性电解质和离子液体电解质中的电化学性能。结果表明，所制成的CQDs微型超级电容器在高达1000 V s〜（-1）的条件下具有出色的速率能力，具有出色的功率响应，并且弛豫时间常数非常短（在水性电解质中t_0 = 103.6μs，t_0 = 53.8μs）在离子液体电解质中），并具有出色的循环稳定性。此外，还使用水性水溶液中的MnO_2纳米针作为正电极和CQDs作为负电极，构建了另一个GQDs // MnO_2不对称超级电容器。在相同的电解液中，其比电容和能量密度均比GQDs // GQDs对称微型超级电容器高两倍。本文介绍的结果可能为GQD在微功率供应商和微储能设备中新的有希望的应用铺平道路。

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  • 来源
    《Advanced Functional Materials》 |2013年第33期|4111-4122|共12页
  • 作者

    Wen-Wen Liu; Ya-Qiang Feng; Xing-Bin Yan; Jiang-Tao Chen; Qun-Ji Xue;

  • 作者单位

    Graduate University of Chinese Academy of Sciences 100080 Beijing, China Laboratory of Clean Energy Chemistry and Materials Lanzhou Institute of Chemical Physics Chinese Academy of Sciences 730000 Lanzhou, P. R. China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, 730000 Lanzhou, P. R. China;

    Laboratory of Clean Energy Chemistry and Materials Lanzhou Institute of Chemical Physics Chinese Academy of Sciences 730000 Lanzhou, P. R. China;

    Laboratory of Clean Energy Chemistry and Materials Lanzhou Institute of Chemical Physics Chinese Academy of Sciences 730000 Lanzhou, P. R. China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, 730000 Lanzhou, P. R. China;

    Laboratory of Clean Energy Chemistry and Materials Lanzhou Institute of Chemical Physics Chinese Academy of Sciences 730000 Lanzhou, P. R. China;

    State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, 730000 Lanzhou, P. R. China;

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