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  • Nitrogen-containing microporous carbon nanospheres with improved capacitive properties

    Author(s)
    Su, Fabing
    Poh, Chee Kok
    Chen, Jun Song
    Xu, Guangwen
    Wang, Dan
    Li, Qin
    Lin, Jianyi
    Lou, Xiong Wen David
    Griffith University Author(s)
    Li, Qin
    Year published
    2011
    Metadata
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    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 ...
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    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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    Journal Title
    Energy & Environmental Science
    Volume
    4
    Issue
    3
    DOI
    https://doi.org/10.1039/C0EE00277A
    Subject
    Chemical engineering not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/44788
    Collection
    • Journal articles

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