Effect of milling conditions on the purity of hydrogen desorbed from ball-milled graphite

Yinghe Zhang, David Book

    研究成果: Article

    12 引用 (Scopus)

    抄録

    During ball milling, graphite can absorb a relatively large amount of hydrogen (7.4 wt %). However, during subsequent heating, hydrogen is usually desorbed together with a small amount of methane. Therefore, there is a need to understand the mechanism of hydrogen sorption. In this work, graphite samples were ball milled in a tungsten carbide pot under 3 bar hydrogen and then characterized by TGA-mass spectrometry, TEM, and Raman spectroscopy. It was found that the optimum milling time was 10 h, resulting in desorption of 5.5 wt % pure hydrogen (using a mass spectrometer) during heating under argon to 990 °C. In samples milled for longer than 10 h the amount of desorbed hydrogen decreased with methane being released in increasing amounts, while the amount of pure desorbed hydrogen was reduced for milling durations less than 10 h. The importance of milling time is discussed in terms of the different reaction steps between carbon and hydrogen atoms, leading to formation of methyl radicals, followed by evolution of methane.

    元の言語English
    ページ(範囲)25285-25289
    ページ数5
    ジャーナルJournal of Physical Chemistry C
    115
    発行部数51
    DOI
    出版物ステータスPublished - 2011 12 29

    Fingerprint

    Graphite
    balls
    Hydrogen
    purity
    graphite
    hydrogen
    Methane
    methane
    heating
    tungsten carbides
    Heating
    Argon
    Tungsten carbide
    Ball milling
    Mass spectrometers
    sorption
    spectroscopy
    mass spectrometers
    hydrogen atoms
    mass spectroscopy

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Electronic, Optical and Magnetic Materials
    • Surfaces, Coatings and Films
    • Energy(all)

    これを引用

    Effect of milling conditions on the purity of hydrogen desorbed from ball-milled graphite. / Zhang, Yinghe; Book, David.

    :: Journal of Physical Chemistry C, 巻 115, 番号 51, 29.12.2011, p. 25285-25289.

    研究成果: Article

    Zhang, Yinghe ; Book, David. / Effect of milling conditions on the purity of hydrogen desorbed from ball-milled graphite. :: Journal of Physical Chemistry C. 2011 ; 巻 115, 番号 51. pp. 25285-25289.
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