Fabrication of graphene-carbon nanotube papers decorated with manganese oxide nanoneedles on the graphene sheets for supercapacitors
Fabrication of graphene-carbon nanotube papers decorated with manganese oxide nanoneedles on the graphene sheets for supercapacitors
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DOI：
10.1039/c3cp53488j
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发表时间：
2014-01-01
影响因子：
3.3
通讯作者：
Kim, Jooheon
中科院分区：
文献类型：
--
作者：
Kim, Myeongjin;Hwang, Yongseon;Kim, Jooheon
在此，3D纳米杂化结构由MnO 2纳米针，碳纳米管（CNT）和石墨烯片制成。采用直接浸纸法制备了纳米结构的三元杂化纸，其中MnO 2纳米针形成在最外层石墨烯层上，碳纳米管通过酰胺键插层在石墨烯层之间.插层的CNT可以分离石墨烯层，从而产生与大的电化学活性位点相关的有效表面积，并在纳米杂化纸内形成电子导电通道。此外，纳米厚的MnO 2在最外层石墨烯层上的均匀分散可以最大化表面积，这可以形成用于离子缓冲储库的孔，以提高电解质离子的扩散速率，并且能够方便地参与赝电容反应。这些纳米结构的三元混合纸表现出增强的比电容相比，石墨烯只有或石墨烯-CNT纸。所提出的纳米混合结构有望为高性能电极的设计和制造奠定基础。
Herein, 3D nanohybrid architectures consisting of MnO2 nanoneedles, carbon nanotubes (CNTs) and graphene sheets are fabricated. Nanostructured ternary hybrid papers in which MnO2 nanoneedles formed on the outermost graphene layer and CNTs intercalated between graphene layers by using the amide bonds are fabricated using the direct paper dipping method. The intercalated CNTs can separate the graphene layers and thus create the effective surface area which is associated with large electrochemically active sites as well as form the electronic conductive channel inside the nanohybrid paper. Moreover, the homogeneous dispersion of nanometer-thick MnO2 on the outermost graphene layer can maximize the surface area which can form pores for ion-buffering reservoirs to improve the diffusion rate of electrolyte ions and enable convenient participation in the pseudo-capacitive reaction. These nanostructured ternary hybrid papers exhibit enhanced specific capacitances compared with graphene-only or graphene-CNT papers. The proposed nanohybrid architectures are expected to lay the foundation for the design and fabrication of high-performance electrodes.