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

Yinghe Zhang, David Book

    研究成果: Article査読

    12 被引用数 (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.

    本文言語English
    ページ(範囲)25285-25289
    ページ数5
    ジャーナルJournal of Physical Chemistry C
    115
    51
    DOI
    出版ステータスPublished - 2011 12 29

    ASJC Scopus subject areas

    • 物理化学および理論化学
    • 電子材料、光学材料、および磁性材料
    • 表面、皮膜および薄膜
    • エネルギー(全般)

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