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Titre du Document
Application of Mg-x wt% MmNi5 (x = 10-70) nanostructured composites in a hydrogen storage device
Auteur(s)
VIJAY R. ; SUNDARESAN R. ; MAIYA M. P. ; ...
Résumé
Large batches (800 g) of nanostructured Mg-xwt% MmNi5 (x = 10-70) composites were prepared by ball milling elemental Mg with MmNi5 in an attritor for 12h under hydrogen atmosphere. There was no alloy formation between Mg and MmNi5 within the milling times employed. The grain size of Mg in the composite varied from 28 to 45 nm, increasing with Mg content, whereas that of MmNi5 was constant at 12nm, irrespective of its concentration in the composite. BET surface area of the milled composites was in the range of 25 to 58m2/g, increased with MmNi5 content. The absorption kinetics and capacities of these composites were measured at 100, 200 and 300°C under 30 bar hydrogen pressure on a small sample of about 8 g. The samples absorbed at all the temperatures, the absorption rate increases with increase in MmNi5 content. But the rates decreased marginally with temperature and attained steady state in less than 400s even at 100°C. However, the hydrogen absorption capacity of the composites followed the Mg content at all the temperatures, with Mg-10wt% MmNi5 showing the highest capacity of 5.1 wt%. MmNi5 has a significant effect on the absorption of hydrogen by Mg at temperatures as low as 100°C, even though hydride of MmNi5was not present in the hydrogenated composite. The nanostructure of Mg together with distribution of MmNi5 on grain surface/grain boundary of Mg appears to have enhanced the absorption, with MmNi5 probab
Editeur
Elsevier
Identifiant
ISSN : 0360-3199 CODEN : IJHEDX
Source
International journal of hydrogen energy A. 2007, vol. 32, n° 13, pp. 2390-2399 [10 pages] [bibl. : 18 ref.]
Langue
Anglais
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