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Structural and H2 sorption properties of MgH 2-10 wt%ZrCrM (M 5 Cu, Ni) nano-composites

TitoloStructural and H2 sorption properties of MgH 2-10 wt%ZrCrM (M 5 Cu, Ni) nano-composites
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2011
AutoriAgarwal, S., Aurora A., Jain A., and Montone Amelia
RivistaJournal of Nanoparticle Research
Volume13
Paginazione5719-5726
ISSN13880764
Parole chiaveAbsorption, Absorption/desorption, alloy, Alloy formation, Alloys, chemical structure, Chromium, conference paper, Copper, Desorption, DSC curves, H2 sorption properties, High energy, Hydrides, Hydriding, Hydrogen, Hydrogen absorption, Hydrogen desorption, Hydrogen storage, Hydrogen storage materials, Hydrogen storage properties, Hydrogen-storage compounds, isotherm, Low costs, Magnesium, Magnesium hydride, Microstructure, Milling (machining), Morphology, nanocomposite, Nanocomposites, Nickel, Onset temperature, powder, Pressure composition isotherms, Pressure ranges, priority journal, Reaction process, Scanning electron microscopy, unclassified drug, Volumetric capacity, X ray diffraction, XRD patterns, zirconium
Abstract

Magnesium and its hydride MgH 2 are widely regarded as promising candidates for hydrogen storage materials due to its benefits of high gravimetric and volumetric capacity, excellent reversibility, abundance in the earth and a low cost. Much attention has been paid to improve its absorption/desorption kinetics, trying to make it useful for practical applications. To make composite of MgH 2 with other hydrogen storage compounds is an effective method to improve the hydrogen storage properties. In this study nanocomposite of MgH 2 with ZrCrCu alloy was prepared using high energy ball-milling for 5 h under Ar atmosphere. Microstructure and morphology of the composites were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM). XRD patterns show that no alloy formation between MgH 2 and elements of the alloys takes place during milling. Different morphology of the powders as-milled and after cycling was observed by SEM. Pressure-composition isotherms of these composites have been obtained in the pressure range 0.1-10 bar at 275 and 300 °C. The absorption/desorption kinetics data have been analyzed using pressure 0.1-5.0 bar at 275 and 300 °C to understand the mechanism of the hydriding/dehydriding reaction processes. A comparison of these results has been attempted with our previous published results of MgH 2-10 wt%ZrCrNi in order to find the better composite for storage applications. It is observed by DSC curves that the onset temperature of hydrogen desorption is decreased for MgH 2-10%ZrCrNi in comparison to MgH 2 which further decreased for MgH 2-10%ZrCrCu. However, little loss in hydrogen absorption/desorption capacity is also observed for ZrCrCu composite in comparison to that of ZrCrNi composite. © Springer Science+Business Media B.V. 2010.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84857055086&doi=10.1007%2fs11051-010-0203-0&partnerID=40&md5=fd59df6d55b1e6cf842685cf50a10068
DOI10.1007/s11051-010-0203-0
Citation KeyAgarwal20115719