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    Cyclic stability and structure of nanoconfined Ti-doped NaAlH4

    Access Status
    Fulltext not available
    Authors
    Paskevicius, Mark
    Filsø, U.
    Karimi, F.
    Puszkiel, J.
    Pranzas, P.
    Pistidda, C.
    Hoell, A.
    Welter, E.
    Schreyer, A.
    Klassen, T.
    Dornheim, M.
    Jensen, T.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Paskevicius, M. and Fils�, U. and Karimi, F. and Puszkiel, J. and Pranzas, P. and Pistidda, C. and Hoell, A. et al. 2016. Cyclic stability and structure of nanoconfined Ti-doped NaAlH4. International Journal of Hydrogen Energy. 41 (7): pp. 4159-4167.
    Source Title
    International Journal of Hydrogen Energy
    DOI
    10.1016/j.ijhydene.2015.12.185
    ISSN
    0360-3199
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/51217
    Collection
    • Curtin Research Publications
    Abstract

    Copyright © 2015 Hydrogen Energy Publications, LLC.NaAlH4 was melt infiltrated within a CO2 activated carbon aerogel, which had been preloaded with TiCl3. Nanoconfinement was verified by Small Angle X-Ray Scattering (SAXS) and the nature of the Ti was investigated with Anomalous SAXS (ASAXS) and X-Ray Absorption Near Edge Structure (XANES) to determine its size and chemical state. The Ti is found to be in a similar state to that found in the bulk Ti-doped NaAlH4 system where it exists as Al1-xTix nanoalloys. Crystalline phases exist within the carbon aerogel pores, which are analysed by in-situ Powder X-Ray Diffraction (PXD) during hydrogen cycling. The in-situ data reveals that the hydrogen release from NaAlH4 and its hydrogen uptake occurs through the Na3AlH6 intermediate when confined at this size scale. The hydrogen capacity from the nanoconfined NaAlH4 is found to initially be much higher in this CO2 activated aerogel compared with previous studies into unactivated aerogels.

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