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    NMR spectroscopic and thermodynamic studies of the etherate and the a, a', and γ phases of AlH3

    Access Status
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    Authors
    Humphries, Terry
    Munroe, K.
    Dewinter, T.
    Jensen, C.
    McGrady, G.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Humphries, T. and Munroe, K. and Dewinter, T. and Jensen, C. and McGrady, G. 2013. NMR spectroscopic and thermodynamic studies of the etherate and the a, a', and γ phases of AlH3. International Journal of Hydrogen Energy. 38 (11): pp. 4577-4586.
    Source Title
    International Journal of Hydrogen Energy
    DOI
    10.1016/j.ijhydene.2013.01.096
    ISSN
    0360-3199
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/42808
    Collection
    • Curtin Research Publications
    Abstract

    Aluminum hydride (alane; AlH3) has been identified as a leading hydrogen storage material by the US Department of Energy. With a high gravimetric hydrogen capacity of 10.1 wt.%, and a hydrogen density of 1.48 g/cm3, AlH3 decomposes cleanly to its elements above 60 °C with no side reactions. This study explores in detail the thermodynamic and spectroscopic properties of AlH3; in particular the α, α′ and γ polymorphs, of which α′-AlH3 is reported for the first time, free from traces of other polymorphs or side products. Thermal analysis of α-, α′-, and γ-AlH3 has been conducted, using DSC and TGA methods, and the results obtained compared with each other and with literature data. All three polymorphs were investigated by 1H MAS-NMR spectroscopy for the first time, and their 27Al MAS-NMR spectra were also measured and compared with literature values. AlH3·nEt2O has also been studied by 1H and 27Al MAS-NMR spectroscopy and DSC and TGA methods, and an accurate decomposition pathway has been established for this adduct.

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