高圧力の科学と技術
Online ISSN : 1348-1940
Print ISSN : 0917-639X
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17 巻 , 3 号
- Introduction to High-Pressure Science for Young Persons -
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特集   中高生のための高圧科学入門
解説
連載解説「水素の話」(3)(4)
  • 竹市 信彦, 田中 秀明, 栗山 信宏
    17 巻 (2007) 3 号 p. 257-263
    公開日: 2007/08/30
    ジャーナル フリー
    In this article, we propose a novel hydrogen storage system which has both lightness and compactness a combination of a lightweight high pressure vessel and hydrogen storage alloy. The system is expected as a promising formation to improve the properties of hydrogen storage techniques in weight and volume other than the conventional techniques using compressed hydrogen or hydrogen storage alloy individually. The novel system requires a hydrogen storage alloy with higher volumetric hydrogen density as well as higher gravimetric density, and with higher equilibrium dissociation pressure than the hydrogen storage alloys which have ever been used for hydrogen storage systems.
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  • 京井 大典, 亀川 厚則, 高村 仁, 岡田 益男, 北村 直之, 境 哲男
    17 巻 (2007) 3 号 p. 264-270
    公開日: 2007/08/30
    ジャーナル フリー
    Among metal hydrides, magnesium hydride (MgH2) would be a promising candidate for hydrogen storage materials because of its high hydrogen-storage capacity (7.6 mass%). However, the dehydrogenation temperature is too high for wide practical applications. Novel magnesium-based hydrides with better dehydrogenation properties than MgH2 can be prepared under hydrogen pressure of gigapascal (GPa). For instance, Mg7TiH16 (6.9 mass%) would release hydrogen at a lower temperature by 130 K than MgH2. The Mg-H ionic bonding distance in Mg7TiH16 is longer than that in MgH2. The observed lower dehydrogenation temperature seems to be consistent with the structure.
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