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Hydrogen storage properties of the Mg/Fe system

✍ Scribed by L. Baum; M. Meyer; L. Mendoza-Zélis

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
352 KB
Volume
389
Category
Article
ISSN
0921-4526

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✦ Synopsis

Magnesium hydride is a very attractive material for solid state hydrogen storage due to their high mass and volume capacity, but its slow absortion/desortion kinetics does not favours its practical use in mobile applications. Recently it has been observed that the addition of small quantities of transition metals or their oxides has an important catalytic effect on its hydrogen sorption kinetics. Although this effect is well documented very little is known about the precise mechanisms involved in the observed sorption rate improvement. We present here a study of the sorption properties of several samples in the MgH 2 /Fe system prepared by mechanical alloying in H 2 atmosphere and starting from mixtures of Mg or MgH 2 with Fe or Fe 2 O 3 of varying composition. The samples were characterized by X-ray diffraction and Mo¨ssbauer spectroscopy, before and after milling and after several H 2 absorption and desorption cycles in a Sievert-type volumetric apparatus. Some differences were found in the desorption kinetics that can be correlated with the microstucture resulting from the milling process.

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