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    New directions for hydrogen storage: Sulphur destabilised sodium aluminium hydride

    193790_193790.pdf (861.8Kb)
    Access Status
    Open access
    Authors
    Sheppard, Drew
    Jepsen, L.
    Jensen, T.
    Paskevicius, Mark
    Buckley, Craig
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Sheppard, Drew A. and Jepsen, Lars H. and Jensen, Torben R. and Paskevicius, Mark and Buckley, Craig E. 2013. New directions for hydrogen storage: Sulphur destabilised sodium aluminium hydride. Journal of Materials Chemistry A. 1 (41): pp. 12775-12781.
    Source Title
    Journal of Materials Chemistry A
    DOI
    10.1039/c3ta12429k
    ISSN
    2050-7488
    Remarks

    Copyright © 2013 The Royal Society of Chemistry

    URI
    http://hdl.handle.net/20.500.11937/15441
    Collection
    • Curtin Research Publications
    Abstract

    Aluminium sulphide (Al2S3) is predicted to effectively destabilise sodium aluminium hydride (NaAlH4) in a single-step endothermic hydrogen release reaction. The experimental results show unexpectedly complex desorption processes and a range of new sulphur containing hydrogen storage materials have been observed. The NaAlH4-Al 2S3 system releases a total of 4.9 wt% of H2 that begins below 100°C without the need for a catalyst. Characterisation via temperature programmed desorption, in situ synchrotron powder X-ray diffraction, ex situ x-ray diffraction, ex situ Fourier transform infrared spectroscopy and hydrogen sorption measurements reveal complex decomposition processes that involve multiple new sulphur-containing hydride compounds. The system shows partial H2 reversibility, without the need for a catalyst, with a stable H2 capacity of ~1.6 wt% over 15 cycles in the temperature range of 200°C to 300°C. This absorption capacity is limited by the need for high H2 pressures (>280 bar) to drive the absorption process at the high temperatures required for reasonable absorption kinetics. The large number of new phases discovered in this system suggests that destabilisation of complex hydrides with metal sulphides is a novel but unexplored research avenue for hydrogen storage materials.

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