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    Novel synthesis of porous aluminium and its application in hydrogen storage

    248458.pdf (1.341Mb)
    Access Status
    Open access
    Authors
    Sofianos, Veronica
    Sheppard, Drew
    Ianni, E.
    Humphries, Terry
    Rowles, Matthew
    Liu, S.
    Buckley, C.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Sofianos, V. and Sheppard, D. and Ianni, E. and Humphries, T. and Rowles, M. and Liu, S. and Buckley, C. 2017. Novel synthesis of porous aluminium and its application in hydrogen storage. Journal of Alloys and Compounds. 702: pp. 309-317.
    Source Title
    Journal of Alloys and Compounds
    DOI
    10.1016/j.jallcom.2017.01.254
    ISSN
    0925-8388
    School
    Department of Physics and Astronomy
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150101708
    URI
    http://hdl.handle.net/20.500.11937/51187
    Collection
    • Curtin Research Publications
    Abstract

    A novel approach for confining LiBH4 within a porous aluminium scaffold was applied in order to enhance its hydrogen storage properties, relative to conventional techniques for confining complex hydrides. The porous aluminium scaffold was fabricated by sintering NaAlH4, which was in the form of a dense pellet, under dynamic vacuum. The final product was a porous aluminium scaffold with the Na and H2 having been removed from the initial pellet. This technique contributed to achieving highly dispersed LiBH4 particles that were also destabilised by the presence of the aluminium scaffold. In this study, the effectiveness of this novel fabrication method of confined/destabilised LiBH4 was extensively investigated, which aimed to simultaneously improve the hydrogen release at lower temperature and the kinetics of the system. These properties were compared with the properties of other confined LiBH4 samples found in the literature. As-synthesised samples were characterised using Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Nitrogen Adsorption measurements. The hydrogen storage capacity of all samples was analysed using temperature programmed desorption in order to provide a comprehensive survey of their hydrogen desorption properties. The porous aluminium scaffold has a wide pore size distribution with most of the porosity due to pores larger than 50 nm. Despite this the onset hydrogen desorption temperature (Tdes) of the LiBH4 infiltrated into the porous aluminium scaffold was 200 °C lower than that of bulk LiBH4 and 100 °C lower than that of nanosized LiBH4. Partial cycling could be achieved below the melting point of LiBH4 but the kinetics of hydrogen release decreased with cycle number.

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