Hydrogen absorption of Mg-Based composites prepared by mechanical milling: Factors affecting its characteristics

Hydriding and dehydriding properties of Mg-based composites (MgG and MgPdG) which are prepared by mechanical milling of magnesium powder and graphite (G) or graphite supporting 5 wt.% Pd (5 wt.% Pd-G) in the presence of various additives (tetrahydrofuran, benzene or cyclohexane) have been studied...

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Bibliographic Details
Published in:Journal of alloys and compounds 1996-01, Vol.232 (1-2), p.218-223
Main Authors: Imamura, Hayao, Sakasai, Nozomu, Kajii, Yasuyuki
Format: Article
Language:English
Subjects:
Composite
Graphite
Hydrogen absorption
Magnesium
Mechanical milling
Metal hydride
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Summary:Hydriding and dehydriding properties of Mg-based composites (MgG and MgPdG) which are prepared by mechanical milling of magnesium powder and graphite (G) or graphite supporting 5 wt.% Pd (5 wt.% Pd-G) in the presence of various additives (tetrahydrofuran, benzene or cyclohexane) have been studied. Such composites were effective as hydrogen storage materials even under mild reaction conditions (500 Torr, 453 K). Factors affecting the hydriding characteristics of the composites were extensively investigated in connection with the preparative conditions (additives and their amounts, milling times, Mg:G component ratios, etc.). In particular, the presence of tetrahydrofuran in the milling process strongly affected the hydriding and dehydriding kinetics of the resulting composites. The active composites for hydrogen storage are those in which finely divided magnesium is in intimate contact with graphite. It is expected that their activity results from certain synergetic interactions between Mg and aromatic carbon atoms of graphite containing charge transfer to some extent.
ISSN:0925-8388
1873-4669
DOI:10.1016/0925-8388(95)01882-4