Magnesium Nanoparticles with Transition Metal Decoration for Hydrogen Storage (Articolo in rivista)

Type
Label
  • Magnesium Nanoparticles with Transition Metal Decoration for Hydrogen Storage (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • L. Pasquini, E. Callini, M. Brighi, F. Boscherini, A. Montone, T. R. Jensen, C. Maurizio, M. Vittori Antisari, E. Bonetti (2011)
    Magnesium Nanoparticles with Transition Metal Decoration for Hydrogen Storage
    in Journal of nanoparticle research
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • L. Pasquini, E. Callini, M. Brighi, F. Boscherini, A. Montone, T. R. Jensen, C. Maurizio, M. Vittori Antisari, E. Bonetti (literal)
Pagina inizio
  • 5727 (literal)
Pagina fine
  • 5737 (literal)
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  • 13 (literal)
Rivista
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  • 10 (literal)
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  • Department of Physics and CNISM, University of Bologna, v. Berti-Pichat 6/2, 40127 Bologna, Italy IOM-CNR, GILDA Beamline, c/o ESRF, BP 220, 38043 Grenoble, France ENEA, C.R. Casaccia, CP 2400, 00123 Rome, Italy Department of Chemistry, Center for Materials Crystallography, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, 8000 Aarhus, Denmark (literal)
Titolo
  • Magnesium Nanoparticles with Transition Metal Decoration for Hydrogen Storage (literal)
Abstract
  • We report on the hydrogen storage behaviour of Mg nanoparticles (NPs) (size range 100 nm-1 lm) with metal-oxide core-shell morphology synthesized by inert gas condensation and decorated by transition metal (TM) (Pd or Ti) clusters via in situ vacuum deposition. The structure and morphology of the as-prepared and hydrogenated NPs is studied by electron microscopy, X-ray diffraction including in situ experiments and X-ray absorption spectroscopy, in order to investigate the relationships with the hydrogen storage kinetics measured by the volumetric Sieverts method. With both Pd and Ti, the decoration deeply improves the hydrogen sorption properties: previously inert NPs exhibit complete hydrogenation with fast transformation kinetics, good stability and reversible gravimetric capacity that can attain 6 wt%. In the case of Pd-decoration, the occurrence of Mg-Pd alloying is observed at high temperatures and in dependence of the hydrogen pressure conditions. These structural transformations modify both the kinetics and thermodynamics of hydride formation, while Ti-decoration has an effect only on the kinetics. The experimental results are discussed in relation with key issues such as the amount of decoration, the heat of mixing between TM and Mg and the binding energy between TM and hydrogen. (literal)
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