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    Nitrogen-containing microporous carbon nanospheres with improved capacitive properties

    Access Status
    Fulltext not available
    Authors
    Su, F.
    Poh, C.
    Chen, J.
    Xu, G.
    Wang, D.
    Li, Qin
    Lin, J.
    Lou, X.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Su, F. and Poh, C. and Chen, J. and Xu, G. and Wang, D. and Li, Q. and Lin, J. et al. 2012. Nitrogen-containing microporous carbon nanospheres with improved capacitive properties. Energy and Environmental Science. 4 (3): pp. 717-724.
    Source Title
    Energy and Environmental Science
    DOI
    10.1039/c0ee00277a
    ISSN
    1754-5692
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/41499
    Collection
    • Curtin Research Publications
    Abstract

    We report the largely improved electrochemical capacitance of polypyrrole-derived microporous carbon nanospheres (MCNs, 80–100 nm in diameter) containing nitrogen functional groups. We have investigated the electrochemical properties of precursor polypyrrole nanospheres (PNs, with a high N/C ratio and low surface area) and as-derived carbon nanospheres (CNs, with a moderate N/C ratio and low surface area) prepared by carbonizing PNs at different temperatures, and MCNs (with a low N/C ratio and high surface area) obtained by chemical activation of CNs. The samples are thoroughly characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, thermogravimetric analysis (TGA), nitrogen sorption, elemental analysis, and X-ray photoelectron spectroscopy (XPS). It is found that MCNs with a high surface area and N-doping species exhibit much better capacitive performance compared to the PNs and CNs, and commercial carbon blacks (XC-72 and BP2000) as well. The MCN sample gives a reversible specific capacitance of [similar]240 F g−1 for 3000 cycles in aqueous media as a result of combined advantages of high electrochemical activity of doped heteroatoms (N and O) and accessible well-developed porosity, demonstrating the promising use in high-energy-density supercapacitors.

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