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Magnesium nanoparticles with transition metal decoration for hydrogen storage

TitleMagnesium nanoparticles with transition metal decoration for hydrogen storage
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2011
AuthorsPasquini, L., Callini E., Brighi M., Boscherini F., Montone Amelia, Jensen T.R., Maurizio C., Antisari M.V., and Bonetti E.
JournalJournal of Nanoparticle Research
Volume13
Pagination5727-5737
ISSN13880764
KeywordsBinding energy, Condensation, conference paper, Core-shell morphologies, Electron microscopy, Energy storage, Fast transformation, Good stability, Gravimetric capacity, gravimetry, Heat of mixing, High temperature, Hydride formation, Hydrogen, Hydrogen pressures, Hydrogen sorption, Hydrogen storage, Hydrogenation, In-situ, In-situ experiments, inert gas, Inert gas condensation, Inert gases, Kinetics, Kinetics and thermodynamics, Magnesium, Metal nanoparticles, metal oxide, Metal-oxide, nanoparticle, Nanoparticles, Palladium, priority journal, Size ranges, Sorption, Structural transformation, Structure and morphology, thermodynamics, Titanium, Transformation kinetics, transition element, Transition metal compounds, Transition metals, X ray absorption spectroscopy, X ray diffraction
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. © Springer Science+Business Media B.V. 2010.

Notes

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84857064813&doi=10.1007%2fs11051-011-0509-6&partnerID=40&md5=d564f1c16da99d56fe7539586b54dcc6
DOI10.1007/s11051-011-0509-6
Citation KeyPasquini20115727