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ID 30795
file
creator
Fujii, Tatsuo
Ishida, Wataru
Isobe, Shigehito
Fuji, Hironobu
subject
Hydrogen absorbing materials
Amorphous materials
Mechanochemical processing
Mossbauer spectroscopy
X-ray and gamma-ray spectroscopies
Thermal analysis
NDC
Chemistry
abstract
On the synthesis of nano-structural hydrogenated graphite by ball-milling under H-2 atmosphere, iron contamination was mingled from steel balls during ball-milling. It is clarified by spectroscopic measurements that the mingled iron formed a non-stoichiometric iron-carbon (Fe-C) compound. The Fe-C phase was transformed to a well-ordered phase with H-2 desorption at 450 degrees C, suggesting that the hydrogen atoms were anomalously trapped at the Fe-C phase. With respect to hydrogen absorbing properties, the mingled iron enhanced the hydrogen capacity by about 50% compared with iron free hydrogenated graphite, where H/Fe was about 13 mass%. Therefore, if the hydrogen absorption site originated in the Fe-C phase could be synthesized independently, it should be recognized as a promising hydrogen storage system.
journal title
Journal of Alloys and Compounds
volume
Volume 507
issue
Issue 2
start page
547
end page
550
date of issued
2010-10-08
publisher
Elsevier Science SA
issn
0925-8388
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2010 Elsevier B.V.
relation url
department
Institute for Advanced Materials Research