Local bonding structure in mechanically activated TiH2 and TiH2+graphite mixture

Transition metals are known to accommodate a great amount of hydrogen and have been studied as promising materials for hydrogen storage. The local bonding structure of mechanically activated TiH2 and TiH,/graphite mixture is studied by means of temperature-programmed desorption (TPD), X-ray emission...

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Published inJournal of alloys and compounds Vol. 395; no. 1-2; pp. 240 - 246
Main Authors Kurmaev, E.Z., Morozova, O., Khomenko, T.I., Borchers, Ch, Nemnonov, S.N., Harada, Y., Tokushima, T., Osawa, H., Takeuchi, T., Shin, S.
Format Journal Article
LanguageEnglish
Published 31.05.2005
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Summary:Transition metals are known to accommodate a great amount of hydrogen and have been studied as promising materials for hydrogen storage. The local bonding structure of mechanically activated TiH2 and TiH,/graphite mixture is studied by means of temperature-programmed desorption (TPD), X-ray emission- and absorption-spectroscopy. Ball milling of TiH2 in the presence of graphite results in a modification of the hydrogen occupation sites. Additional Ti-C bonds from chemical bonding of Ti with carbon, which occupies octahedral interstitials, appears in TiH2 due to intimate contact between graphite and TiH2 nanoparticles embedded into an amorphous graphite matrix. Mixed configurations around Ti atoms with proportional combination of local Ti-H and Ti-C bonds significantly decrease the thermal stability of TiH2.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0925-8388
DOI:10.1016/j.jallcom.2004.11.031