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Polypyrrole-decorated 2D carbon nanosheet electrodes for supercapacitors with high areal capacitance

机译：达白罗尔装饰的2D碳纳蒙电极，适用于具有高面积电容的超级电容器

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摘要

Nanocarbon electrodes such as carbon nanotubes, graphene, graphene oxide, etc. are costly materials and hence it is necessary to develop new carbonaceous materials for application as electrodes for low cost supercapacitors (SCs) with high performance. Highly capacitive cost-free electrodes are synthesized with hierarchically mesoporous 2D exfoliated graphite nanosheet (EGN)/polypyrrole (PPY) (EGN/PPY) nanocomposites for supercapacitors (SCs). Initially, EGN is synthesized by a microwave irradiation technique from natural flake graphite with the help of perchloric acid-sulphuric acid-potassium dichromate-acetic acid anhydride based graphite intercalation system and EGN/PPY nanocomposites are prepared by in situ oxidative chemical polymerization thereafter. The EGN exhibits a Brunauer-Emmett-Teller surface area of 620 m(2) g(-1) with a mesoporous structure (average pore diameter similar to 11 nm). The electron probe-microanalysis reveals that the PPY is uniformly coated over the surface of EGN. The surface topographies of the nanocomposites are examined by scanning electron microscopy and transmission electron microscopy. The structure and chemical bonding of the nanocomposites are determined by X-ray diffraction, Raman spectroscopy and Fourier-transform infrared spectroscopy. XPS analysis shows that various chemical species are attached on the surface of the EGN/PPY nanocomposites. The electrochemical properties of the symmetric type EGN/PPY SC cells are examined by electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge/discharge measurements. The galvanostatic charge/discharge measurement shows that the EGN/PPY SC cell exhibits a maximum area specific capacitance of 376.9 mF cm(-2) with an area specific energy density of 0.052 mW h cm(-2) at a current density of 0.25 mA cm(-2) and it has a good cycle life too.
机译：纳米碳电极如碳纳米管，石墨烯，氧化烯烯等是昂贵的材料，因此有必要为具有高性能的低成本超级电容器（SCS）的电极开发新的碳质材料。高性电容性的无成本电极用分层介孔2D剥离石墨纳米片（EGN）/聚吡咯（PPY）（EGN / PPY）纳米复合材料合成，用于超级电容器（SCS）。最初，通过从天然薄片石墨中通过高氯酸 - 硫酸 - 硫酸酸酐基于石墨嵌入式的石墨嵌入系统，通过此后原位制备EGN / PPY纳米复合材料的eGN。此后通过原位氧化化学聚合制备EGN / PPY纳米复合材料。 EGN展示了具有介孔结构（平均孔径至11nm）的Brunauer-Emmett-extrese面积为620m（2 )g（-1）。电子探针微分析显示，PPY均匀地涂覆在EGN的表面上。通过扫描电子显微镜和透射电子显微镜检查纳米复合材料的表面拓扑。纳米复合材料的结构和化学键合由X射线衍射，拉曼光谱和傅里叶变换红外光谱法测定。 XPS分析表明，各种化学物质附着在EGN / PPY纳米复合材料的表面上。通过电化学阻抗光谱，循环伏安法和电热电荷/放电测量检查对称型EGN / PPY SC细胞的电化学性质。镀锌电荷/放电测量表明，EGN / PPY SC电池具有376.9mF cm（-2）的最大面积特异性电容，面积特异性能量密度为0.052mW H cm（-2）的电流密度为0.25 mA cm（-2），它也有一个良好的循环寿命。

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  • 来源
    《RSC Advances》 |2016年第65期|共13页
  • 作者

    Cherusseri Jayesh; Kar Kamal K.;

  • 作者单位

    Indian Inst Technol Kanpur Mat Sci Programme Adv Nanoengn Mat Lab Kanpur 208016 Uttar Pradesh India;

    Indian Inst Technol Kanpur Mat Sci Programme Adv Nanoengn Mat Lab Kanpur 208016 Uttar Pradesh India;

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  • 正文语种 eng
  • 中图分类 化学;
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