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Solid state synthesis of nano-sized AlH3 and its dehydriding behaviourElectronic supplementary information (ESI) available: XRD patterns and SEM observations of the reagent, and isothermal desorption curves of the MgH2/AlCl3 powders. See DOI: 10.1039/c5gc00426h
Aluminum hydride (AlH 3 ) has a high gravimetric hydrogen capacity (10.1 wt%) and has attracted considerable attention due to its potential application for hydrogen storage. Up to now, almost all the routes developed for the synthesis of AlH 3 are energy-consuming and economically impractical for ma...
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Format: | Article |
Language: | English |
Online Access: | Get full text |
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Summary: | Aluminum hydride (AlH
3
) has a high gravimetric hydrogen capacity (10.1 wt%) and has attracted considerable attention due to its potential application for hydrogen storage. Up to now, almost all the routes developed for the synthesis of AlH
3
are energy-consuming and economically impractical for mass production. In this study, a cost effective route of solid state reactive milling was proposed to synthesize AlH
3
using aluminum chloride and cheap metal hydrides as starting reagents, with the LiH/AlCl
3
, MgH
2
/AlCl
3
, and CaH
2
/AlCl
3
reaction systems being experimentally investigated. The reaction progress and products during reactive milling were characterized by XRD and
27
Al NMR, and the morphology as well as the microstructure of the as-milled samples by SEM and TEM, respectively. It was found that nano-sized γ-AlH
3
could be synthesized by reactive milling with commercial AlCl
3
and nanocrystalline MgH
2
as reagents. Based on the XRD and NMR analyses as well as the TEM observation, the average size of the γ-AlH
3
phase in the as-synthesized γ-AlH
3
/MgCl
2
nanocomposite was estimated to be about 8.5 nm. By an isothermal dehydrogenation test, the as-synthesized γ-AlH
3
was found to have a quite high hydrogen desorption capacity and fast kinetics, with a hydrogen desorption amount of about 9.71 wt% within 9080 s at 220 °C.
An investigation on the synthesis of nano-sized AlH
3
by the solid state reaction between aluminum chloride (AlCl
3
) and cheap magnesium hydride (MgH
2
). |
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ISSN: | 1463-9262 1463-9270 |
DOI: | 10.1039/c5gc00426h |