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ID 20040
file
creator
Hanada, Nobuko
Hino, Satoshi
Fujii, Hironobu
subject
hydrogen storage materials
high energy ballmilling
thermal analysis
NDC
Physics
abstract
Kinetics of hydrogen absorption and desorption reactions was investigated on the MgH2 composite doped with 1 mol% Nb2O5 as a catalyst by ballmilling. The composite after dehydrogenation at 200 °C absorbed gaseous hydrogen of ~ 4.5 mass% even at room temperature under lower pressure than 1 MPa within 15 sec and finally its capacity reached more than 5 mass%. On the other hand, the catalyzed MgH2 after rehydrogenation desorbed ~6 mass% hydrogen at 160 ºC under purified He flow, which followed the first order reaction. From the Kissinger plot, the activation energy for hydrogen desorption was estimated to be ~71 kJ/molH2, indicating the product was significantly activated due to the catalytic effect of Nb2O5.
journal title
Journal of Alloys and Compounds
volume
Volume 420
issue
Issue 1-2
start page
46
end page
49
date of issued
2006-08-31
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) 2005 Elsevier B.V.
relation url
department
Natural Science Center for Basic Research and Development
Institute for Advanced Materials Research