Hydrogen in the mechanically prepared nanostructured graphite

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  • S. Orimo
    Max-Planck-Institut für Metallforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
  • G. Majer
    Max-Planck-Institut für Metallforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
  • T. Fukunaga
    Research Reactor Institute, Kyoto University, Osaka 590-0494, Japan
  • A. Züttel
    University of Fribourg, Physics Institute, Perolles 1700, Switzerland
  • L. Schlapbach
    University of Fribourg, Physics Institute, Perolles 1700, Switzerland
  • H. Fujii
    Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan

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<jats:p>Nanostructured graphite was prepared by mechanical milling under hydrogen atmosphere. Several samples obtained after different milling times were systematically examined to get fundamental information about the structures and hydrogen concentrations. After the expansion of the graphite interlayer, the long-range ordering of the interlayer disappears continuously with increasing milling time. The hydrogen concentration reaches up to 7.4 mass % (CH0.95) after milling for 80 h. Judging from the radial distribution function determined by the neutron diffraction measurement, there are two types of deuterium coordinations: deuterium atoms in the graphite interlayers and that with the CDx covalent bonds, respectively.</jats:p>

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