Fabrication of graphene sheets intercalated with manganese oxide/carbon nanofibers: toward high-capacity energy storage.
Fabrication of graphene sheets intercalated with manganese oxide/carbon nanofibers: toward high-capacity energy storage.
复制标题
DOI：
10.1002/smll.201201754
复制
发表时间：
2013-01
期刊：
影响因子：
13.3
通讯作者：
Oh Seok Kwon;Taejoon Kim;J. S. Lee;S. Park;Hyunwong Park;Mi-Sung Kang;J. E. Lee;J. Jang;
中科院分区：
文献类型：
--
作者：
Oh Seok Kwon;Taejoon Kim;J. S. Lee;S. Park;Hyunwong Park;Mi-Sung Kang;J. E. Lee;J. Jang;
在此，制造了由 MnO(x) 纳米晶体、碳纳米纤维 (CNF) 和石墨烯片组成的 3D 纳米混合结构。通过单喷嘴共静电纺丝，然后进行热处理，很容易获得直径约为 50 nm 的 MnO(x) 装饰的 CNF（MCNF）。然后将 MCNF 插入石墨烯片之间，产生三元纳米杂化 MCNF/还原氧化石墨烯 (RGO)。这种简单的合成过程很容易提供数十克规模的产品。超薄 CNF 可能是碳纳米管 (CNT) 的有前途的替代品，它克服了优异的赝电容成分 MnO(x) 的低电导率。此外，由 MCNF 分隔的石墨烯片提高了纳米混合电极的电化学性能。与仅由 MCNF 或仅 RGO 制成的片状电极相比，这些纳米混合电极表现出增强的比电容。显然，RGO 片充当纳米杂化材料内部的导电通道，而插入的 MCNF 则提高了纳米杂化材料中离子和电荷转移的效率。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 MnO(x) nanocrystals, carbon nanofibers (CNFs), and graphene sheets are fabricated. MnO(x) -decorated CNFs (MCNFs) with diameters of about 50 nm are readily obtained via single-nozzle co-electrospinning, followed by heat treatment. The MCNFs are then intercalated between graphene sheets, yielding the ternary nanohybrid MCNF/reduced graphene oxide (RGO). This straightforward synthesis process readily affords product on a scale of tens of grams. The ultrathin CNFs, which might be a promising alternative to carbon nanotubes (CNTs), overcome the low electrical conductivity of the excellent pseudocapacitive component, MnO(x) . Furthermore, the graphene sheets separated by the MCNFs boost the electrochemical performance of the nanohybrid electrodes. These nanohybrid electrodes exhibit enhanced specific capacitances compared with a sheet electrode fabricated of MCNF-only or RGO-only. Evidently, the RGO sheet acts as a conductive channel inside the nanohybrid, while the intercalated MCNFs increase the efficiency of the ion and charge transfer in the nanohybrid. The proposed nanohybrid architectures are expected to lay the foundation for the design and fabrication of high-performance electrodes.