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基于收缩高密度碳纳米管阵列的柔性固态超级电容器

朱畦 袁协涛 诸翊豪 张晓华 杨朝晖

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基于收缩高密度碳纳米管阵列的柔性固态超级电容器

朱畦, 袁协涛, 诸翊豪, 张晓华, 杨朝晖

Flexible solid-state supercapacitors based on shrunk high-density aligned carbon nanotube arrays

Zhu Qi, Yuan Xie-Tao, Zhu Yi-Hao, Zhang Xiao-Hua, Yang Zhao-Hui
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  • 柔性超级电容器因其加工方式灵活,具有高的能量密度和可剪裁可弯曲的特性,近年来受到广泛的关注.碳纳米管阵列凭借其自身良好的电化学性能、高效的电荷转移率和良好的循环寿命被视为理想的能量储存材料.然而原始碳纳米管阵列密度较小,且因管间较弱的相互作用力使得其在加工和转移过程中容易倒塌散落,从而限制了碳纳米管阵列直接用于组装柔性电子器件.本文应用无水乙醇对阵列进行收缩处理,在保持阵列高度取向优势的前提下大大增加了阵列的密度和机械强度,同时使用生物相容性好的聚乙烯醇(PVA)导电凝胶包埋碳纳米管阵列来制备柔性固态超级电容器件.PVA包埋的阵列复合体在折叠、弯曲过程中既能保持良好的机械稳定性和柔性,又能保持碳纳米管的高度取向性.使用原位电氧化对碳纳米管阵列外壁进行简单的电化学修饰,可以进一步提高该复合器件的性能.该方法为未来研发可穿戴电子器件以及可植入医学器件提供了新思路.
    Nowadays flexible solid-state supercapacitors (FSCs) have received more and more attention than conventional capacitors due to the good operability and flexible fabrication process as well as high specific/volumetric energy density. In general, carbon based materials including amorphous carbon, carbon nanotube, grapheme, etc. can be used to fabricate electrolytic double-layer capacitance (EDLC)-type FSCs due to its extraordinary cyclic stability at high current density. Aligned carbon nanotube (ACNT) arrays are one of the ideal electrode candidates for energy storage due to their good capacity, highly efficient charge transfer rate, excellent rate performance and long cycle life compared with those of other carbon-based materials carbon nanotubes. However, the low density and the weak interaction between the carbon tubes cause the CNT arrays to tend to easily collapse during processing and transferring. Thus pure carbon nanotube arrays are unable to be directly used to assemble flexible electronic devices. In this paper, we use ethyl alcohol to shrink the CNT array to increase the density and mechanical strength. At the same time we embed the conductive polyvingle alcohol (PVA) gel into the carbon nanotube array to fabricate a flexible solid supercapacitor. Hydrogel-based solid electrolytes have been long considered to be used to prepare FSCs, because this method possesses obvious advantages including low cost, good environmental compatibility and simple manufacturing process. The ACNT/PVA complex can maintain good mechanical stability and flexibility during its folding and bending, and can also keep the high orientation of carbon nanotubes. The maximum capacitance of the hybrid flexible device can reach 458 mFcm-3 at a current density of 10 mAcm-3, which is much higher than the capacitance reported in the literature. After 5000 charging-discharging cycles, a capacity still keeps nearly 100%. The maximum energy density of CNTs/gel composite device can reach 0.04 mWhcm-3 with an average power density of 3.7 mWcm-3. The capacitance can be further increased to 618 mFcm-3 by a simple in-situ electrochemical oxidation treatment. The energy density can be further increased to 0.07 mWhcm-3 by the electro-oxidation treatment. The electrochemical performance of the device is far superior to that of EDLC-typed FSC reported in the literature. Additionally the equivalent series resistance (RESR) of the devices decreases from 120 to 30 and also the charge transfer resistance declines from 90 to 10 . This is mainly due to the effect of pseudo capacitance and electro-wetting effect caused by electro-oxidation. This easy-to-assemble hybrid devices thus potentially pave the way for manufacturing wearable devices and implantable medical devices.
      通信作者: 杨朝晖, yangzhaohui@suda.edu.cn
    • 基金项目: 国家自然科学基金(批准号:21204059)、江苏省特聘教授计划和天津工业大学膜分离及膜过程国家重点实验室开放课题(批准号:M2-201501)资助的课题.
      Corresponding author: Yang Zhao-Hui, yangzhaohui@suda.edu.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 21204059), the Specially-Appointed Professor Plan in Jiangsu Province, China, and the State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, China (Grant No. M2-201501).
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    [7]

    Lu X, Yu M, Wang G, Tong Y, Li Y 2014 Energy Environ. Sci. 7 2160

    [8]

    He Y, Chen W, Gao C, Zhou J, Li X, Xie E 2013 Nanoscale 5 8799

    [9]

    Yang P, Mai W 2014 Nano Energy 8 274

    [10]

    Liu L, Niu Z, Chen J 2016 Chem. Soc. Rev. 45 4340

    [11]

    Simon P, Gogotsi Y 2013 Accounts of Chemical Research 46 1094

    [12]

    Fic K, Lota G, Meller M, Frackowiak E 2012 Energy Environ. Sci. 5 5842

    [13]

    Lin Z, Zeng Z, Gui X, Tang Z, Zou M, Cao A 2016 Adv. Energy Mater. 6 1600554

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    Jiang H, Lee P S, Li C 2013 Energy Environ. Sci. 6 41

    [15]

    Zhang H, Cao G, Yang Y 2009 Energy Environ. Sci. 2 932

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    Talapatra S, Kar S, Pal S K, Vajtai R, Ci L, Victor P, Shaijumon M M, Kaur S, Nalamasu O, Ajayan P M 2006 Nature Nanotechnol. 1 112

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    Pushparaj V L, Shaijumon M M, Kumar A, Murugesan S, Ci L, Vajtai R, Linhardt R J, Nalamasu O, Ajayan P M 2007 Proc. Nat. Acad. Sci. USA 104 13574

    [18]

    Futaba D N, Hata K, Yamada T, Hiraoka T, Hayamizu Y, Kakudate Y, Tanaike O, Hatori H, Yumura M, Iijima S 2006 Nat. Mater. 5 987

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    Hata K, Futaba D N, Mizuno K, Namai T, Yumura M, Iijima S 2004 Science 306 1362

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    Liu Z, Liao G, Li S, Pan Y, Wang X, Weng Y, Zhang X, Yang Z 2013 J. Mater. Chem. A 1 13321

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    Hsia B, Marschewski J, Wang S, In J B, Carraro C, Poulikakos D, Grigoropoulos C P, Maboudian R 2014 Nanotechnology 25 055401

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    Kang Y J, Chung H, Han C H, Kim W 2012 Nanotechnology 23 065401

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    Kaempgen M, Chan C K, Ma J, Cui Y and Gruner G 2009 Nano Lett. 9 1872

    [24]

    El-Kady M F, Strong V, Dubin S, Kaner R B 2012 Science 335 1326

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出版历程
  • 收稿日期:  2017-08-17
  • 修回日期:  2017-10-20
  • 刊出日期:  2019-01-20

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