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    Physicochemical Characterization of a Na-H-F Thermal Battery Material

    Access Status
    Fulltext not available
    Embargo Lift Date
    2021-02-06
    Authors
    Humphries, Terry
    Rawal, A.
    Rowles, Matthew
    Prause, C.R.
    Bird, Julianne
    Paskevicius, Mark
    Sofianos, M. Veronica
    Buckley, Craig
    Date
    2020
    Type
    Journal Article
    
    Metadata
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    Citation
    Humphries, T.D. and Rawal, A. and Rowles, M.R. and Prause, C.R. and Bird, J.E. and Paskevicius, M. and Sofianos, M.V. et al. 2020. Physicochemical Characterization of a Na-H-F Thermal Battery Material. Journal of Physical Chemistry C. 124 (9): pp. 5053-5060.
    Source Title
    Journal of Physical Chemistry C
    DOI
    10.1021/acs.jpcc.9b10934
    ISSN
    1932-7447
    Faculty
    Faculty of Science and Engineering
    School
    John de Laeter Centre (JdLC)
    School of Electrical Engineering, Computing and Mathematical Sciences (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/LP120101848
    http://purl.org/au-research/grants/arc/LP150100730
    http://purl.org/au-research/grants/arc/FT160100303
    URI
    http://hdl.handle.net/20.500.11937/82255
    Collection
    • Curtin Research Publications
    Abstract

    Copyright © 2020 American Chemical Society. Fluorine-substituted sodium hydride is investigated for application as a thermal energy storage material inside thermal batteries. A range of compositions of NaHxF1-x (x = 0, 0.5, 0.7, 0.85, 0.95, 1) have been studied using synchrotron radiation powder X-ray diffraction (SR-XRD), near-edge X-ray absorption fine structure spectroscopy (NEXAFS), and nuclear magnetic resonance spectroscopy (NMR), with the thermal conductivity and melting points also being determined. SR-XRD and NMR spectroscopy studies identified that the solid solutions formed during synthesis contain multiple phases rather than a single stoichiometric compound, despite the materials exhibiting a single melting point. As the fluorine content of the materials increases, the Na-H(F) bond length decreases, increasing the stability of the compound. This trend is also observed during melting point analysis where increasing the fluorine content increases the melting point of the material; that is, x < 0.3 (i.e., F- > 0.7) enables melting at temperatures above 750 °C.

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