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  • Etched nanoholes in graphitic surfaces for enhanced electrochemistry of basal plane

    Author(s)
    An, Hongjie
    Moo, James Guo Sheng
    Tan, Beng Hau
    Liu, Sheng
    Pumera, Martin
    Ohl, Claus-Dieter
    Griffith University Author(s)
    An, Hongjie
    Year published
    2017
    Metadata
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    Abstract
    The understanding and tailoring of the electrochemistry of graphite is of significant industrial importance. We develop a method of etching pits into the basal planes of highly oriented pyrolytic graphite (HOPG) by electrolysis. The etching of HOPG was realized by performing electrochemical reactions at alternating potentials at room temperature, and the resulting membranes are characterized using atomic force microscopy, scanning electron microscopy, X-ray photoelectron spectra, X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectrscopy, and cyclic voltammetry. Etching only occurs when the electrolysis ...
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    The understanding and tailoring of the electrochemistry of graphite is of significant industrial importance. We develop a method of etching pits into the basal planes of highly oriented pyrolytic graphite (HOPG) by electrolysis. The etching of HOPG was realized by performing electrochemical reactions at alternating potentials at room temperature, and the resulting membranes are characterized using atomic force microscopy, scanning electron microscopy, X-ray photoelectron spectra, X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectrscopy, and cyclic voltammetry. Etching only occurs when the electrolysis at negative bias is followed by a brief switch to a positive bias. The size of the etched pits can be tuned by varying the applied potential and reaction time, with deeper pits formed with increased redox cycles and reaction time. Cyclic voltammetry reveals that the electrochemical performance is enhanced greatly as etching progresses due to exposure of edge sites. For its ease of application, efficiency and low cost, our wet etching approach has great promise as a method to develop high active electrodes and nanoporous membranes at large scales for various industrial applications.
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    Journal Title
    Carbon
    Volume
    123
    DOI
    https://doi.org/10.1016/j.carbon.2017.07.029
    Subject
    Physical sciences
    Chemical sciences
    Engineering
    Science & Technology
    Chemistry, Physical
    Materials Science, Multidisciplinary
    Publication URI
    http://hdl.handle.net/10072/400790
    Collection
    • Journal articles

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