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ID 20037
file
creator
Fujii, Hironobu
subject
hydrogen absorbing materials
nanostructured materials
solid state reactions
thermodynamic properties
thermal analysis
NDC
Physics
abstract
Hydrogen desorption properties of mechanically milled materials composed of nano-structural hydrogenated-graphite (CnanoHx) and alkali(-earth) metal hydride (MH; M = Na, Mg and Ca) were investigated from the thermodynamic and structural points of view. The hydrogen desorption temperature for all the CnanoHx and MH composites was obviously lower than that of the corresponding each hydride. In addition, the desorption of hydrocarbons from CnanoHx was significantly suppressed by making composite of CnanoHx with MH, even though CnanoHx itself thermally desorbs a considerably large amount of hydrocarbons. These results indicate that an interaction exists between CnanoHx and MH, and hydrogen in both the phases is destabilized by a close contact between polar C-H groups in CnanoHx and the MH solid phase. Moreover, a new type of chemical bonding between the nano-structural carbon (Cnano) and the Li, Ca, or Mg metal atoms may be formed after hydrogen desorption. Thus, the above metal-C-H system would be recognized as a new family of H-storage materials.
journal title
Journal of Alloys and Compounds
volume
Volume 432
issue
Issue 1-2
start page
303
end page
307
date of issued
2007-04-25
publisher
Elsevier B.V.
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) 2006 Elsevier B.V.
relation url
department
Natural Science Center for Basic Research and Development
Institute for Advanced Materials Research