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ID 20047
本文ファイル
著者
Chen, D. M.
Isobe, Shigehito
Gomibuchi, Emi
Fujii, Hironobu
キーワード
Hydrogen
Graphite
Catalysis
Chemisorption
Iron
Carbides
NDC
物理学
抄録(英)
We investigated hydrogen absorption/desorption and structural properties in mechanically milled graphite under hydrogen pressures up to 6 MPa to clarify catalytic and hydrogen pressure effects in the milling. The results indicate that a small amount of iron contamination during milling plays a quite important role as a catalyst for hydrogen absorption/desorption properties in graphite. Two-peak structure for hydrogen desorption in the TDS profile is due to existence of two different occupation sites for hydrogen, which is caused by the existence of high dispersing iron on graphite. From the experiment of high pressure milling, we clarified that the number of defects in graphite decreases with increasing the atmospheric hydrogen pressure during milling, leading to the decrease in the absorbed hydrogen content and the stabilization of hydrogen on the occupation sites. In addition, we confirmed the existence of physisorption-like reversible hydrogen at room temperature in the graphite prepared by milling under high pressure hydrogen atmosphere above 3 MPa. This unstable hydrogen might strongly be correlated with the existence of the lamella structure in nanometer scale, which only leaves in graphite prepared by high pressure milling.
掲載誌名
Materials Science and Engineering B
108巻
1-2号
開始ページ
138
終了ページ
142
出版年月日
2004-04-25
出版者
Elsevier B.V.
ISSN
0921-5107
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) 2003 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