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ID 20036
本文ファイル
著者
Tokoyoda, Kazuhiko
Hino, Satoshi
Okamoto, Keisuke
Fujii, Hironobu
キーワード
Hydrogen storage materials
Gas-solid reactions
ball-milling
calcium amide
NDC
物理学
抄録(英)
Hydrogen storage properties of two ball-milled composites of Ca(NH2)2+2LiH and CaH2+2LiNH2 were investigated as a series of searching studies of high performance hydrogen storage materials. About 4.5 mass% hydrogen is desorbed from about 100 °C and the thermal desorption profiles show a peak around 200 and 220 °C for the composites of CaH2+2LiNH2 and Ca(NH2)2+2LiH, respectively, under a helium flow at 5 °C/min heating rate without any NH3 emission within our experimental accuracy. The powder X-ray diffraction and infrared absorption spectroscopy indicated that the dehydrogenated states of both composites form "an unknown imide phase" after heating up to 400 °C, while the dehydrogenated states after heating up to 200 °C in vacuum are the mixed phases of Li2NH and CaNH. The rehydrogenated state for the ball-milled composite of CaH2+2LiNH2 is transformed into the composite of Ca(NH2)2 and 2LiH by repeating the dehydrogenation and rehydrogenation cycles at 180~200 °C.
掲載誌名
Journal of Alloys and Compounds
439巻
1-2号
開始ページ
337
終了ページ
341
出版年月日
2007-07-31
出版者
Elsevier B.V.
ISSN
0925-8388
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
author
権利情報
Copyright (c) 2007 Elsevier B.V.
関連情報URL
部局名
自然科学研究支援開発センター
先進機能物質研究センター