Xiao, X., Liu, Z., Yarahmadi, S. S. and Gregory, D. (2016) Facile preparation of β-/γ-MgH2 nanocomposites under mild conditions and pathways to rapid dehydrogenation. Physical Chemistry Chemical Physics, 18(15), pp. 10492-10498. (doi: 10.1039/C5CP07762A) (PMID:27030171)
Text
117819Suppl.pdf - Supplemental Material Restricted to Repository staff only 225kB | ||
|
Text
117819.pdf - Accepted Version 913kB |
Abstract
A magnesium hydride composite with enhanced hydrogen desorption kinetics can be synthesized via a simple wet chemical route by ball milling MgH2 with LiCl as an additive at room temperature followed by tetrahydrofuran (THF) treatment under an Ar atmosphere. The as-synthesized composite comprises ca. 18 mass% orthorhombic γ-MgH2 and 80 mass% tetragonal β-MgH2 as submicron-sized particles. The β-/γ-MgH2 nanocomposite exhibits a dehydrogenation capacity of 6.6 wt.% and starts to release hydrogen at ~260 °C; ca. 140 °C lower than that of commercial MgH2. The apparent activation energy for dehydrogenation is 115±3 kJ mol-1, which is ca. 46 % lower than that of commercial MgH2. Analysis suggests that the meta-stable γ-MgH2 component either directly dehydrogenates exothermically or first transforms into stable β-MgH2 very close to the dehydrogenation onset. The improved hydrogen release performance can be attributed both to the existence of the MgH2 nanostructure and to the presence of γ-MgH2.
Item Type: | Articles |
---|---|
Additional Information: | The authors gratefully acknowledge financial support from the University of Glasgow and the National Natural Science Foundation of China (51571179). DHG also thanks the China Scholarship Council for the award of a scholarship to ZL. |
Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Xiao, Professor Xuezhang and Gregory, Professor Duncan |
Authors: | Xiao, X., Liu, Z., Yarahmadi, S. S., and Gregory, D. |
College/School: | College of Science and Engineering > School of Chemistry |
Journal Name: | Physical Chemistry Chemical Physics |
Publisher: | Royal Society of Chemistry |
ISSN: | 1463-9076 |
ISSN (Online): | 1463-9084 |
Published Online: | 22 March 2016 |
Copyright Holders: | Copyright © 2016 Royal Society of Chemistry |
First Published: | First published in Physical Chemistry Chemical Physics 18(15):10492-10498 |
Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher |
University Staff: Request a correction | Enlighten Editors: Update this record