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Issue 60, 2016
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Dimensional tailoring of nitrogen-doped graphene for high performance supercapacitors

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Abstract

Due to its unique properties, graphene has been regarded as a promising electrode material in various fields of energy conversion and storage devices. In supercapacitors, however, the graphene electrodes show unexpectedly poor energy densities due to low transferability of charge carriers in the randomly overlaid graphene electrodes. For efficient charge transfers, construction of three-dimensional graphene structures has been generally considered. In this study, contrary to previous strategies, the graphene structures are sequentially tailored from two-dimensional sheets to one-dimensional ribbons and zero-dimensional dots, and then their capacitive behaviors are investigated in a symmetric unit cell. Dimensionality of the graphene determines the local pore structure and morphology of the fabricated graphene electrodes. Hence, it strongly affects the transfer rate of charge carriers and capacitive performance. One-dimensional ribbons, which have a high length-to-width ratio and a consequent net-like porous structure in the fabricated electrode, demonstrate an efficient charge transferability with 378 F gāˆ’1 specific capacitance at 1 A gāˆ’1 current density in 6 M KOH electrolyte. Additionally, a durability study coupled with X-ray photoelectron spectroscopy (XPS) reveals that performance degradation of the graphene-based electrodes mainly results from surface oxidation which inhibits facile electron transfers.

Graphical abstract: Dimensional tailoring of nitrogen-doped graphene for high performance supercapacitors

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Publication details

The article was received on 25 Mar 2016, accepted on 03 Jun 2016 and first published on 06 Jun 2016


Article type: Paper
DOI: 10.1039/C6RA07825G
RSC Adv., 2016,6, 55577-55583

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    Dimensional tailoring of nitrogen-doped graphene for high performance supercapacitors

    S. Y. Lee, C. H. Choi, M. W. Chung, J. H. Chung and S. I. Woo, RSC Adv., 2016, 6, 55577
    DOI: 10.1039/C6RA07825G

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