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    Thermochemical energy storage performance of zinc destabilized calcium hydride at high-temperatures

    82301.pdf (1.695Mb)
    Access Status
    Open access
    Authors
    Balakrishnan, Sruthy
    Sofianos, M. Veronica
    Humphries, Terry
    Paskevicius, Mark
    Buckley, Craig
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Balakrishnan, S. and Sofianos, M.V. and Humphries, T.D. and Paskevicius, M. and Buckley, C.E. 2020. Thermochemical energy storage performance of zinc destabilized calcium hydride at high-temperatures. Physical Chemistry Chemical Physics. 22 (44): pp. 25780-25788.
    Source Title
    Physical Chemistry Chemical Physics
    DOI
    10.1039/d0cp04431h
    ISSN
    1463-9076
    Faculty
    Faculty of Science and Engineering
    School
    School of Electrical Engineering, Computing and Mathematical Sciences (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/LE0775551
    http://purl.org/au-research/grants/arc/LP150100730
    http://purl.org/au-research/grants/arc/LE0989180
    http://purl.org/au-research/grants/arc/FT160100303
    http://purl.org/au-research/grants/arc/LE170100199
    URI
    http://hdl.handle.net/20.500.11937/82259
    Collection
    • Curtin Research Publications
    Abstract

    © the Owner Societies.

    CaH2 has 20 times the energy density of molten salts and was patented in 2010 as a potential solar thermal energy storage material. Unfortunately, its high operating temperature (>1000 °C) and corrosivity at that temperature make it challenging to use as a thermal energy storage (TES) material in concentrating solar power (CSP) plants. To overcome these practical limitations, here we propose the thermodynamic destabilization of CaH2 with Zn metal. It is a unique approach that reduces the decomposition temperature of pure CaH2 (1100 °C at 1 bar of H2 pressure) to 597 °C at 1 bar of H2 pressure. Its new decomposition temperature is closer to the required target temperature range for TES materials used in proposed third-generation high-temperature CSP plants. A three-step dehydrogenation reaction between CaH2 and Zn (1 : 3 molar ratio) was identified from mass spectrometry, temperature-programmed desorption and in situ X-ray diffraction studies. Three reaction products, CaZn13, CaZn11 and CaZn5, were confirmed from in situ X-ray diffraction studies at 190 °C, 390 °C and 590 °C, respectively. The experimental enthalpy and entropy of the second hydrogen release reaction were determined by pressure composition isotherm measurements, conducted between 565 and 614 °C, as ΔHdes = 131 ± 4 kJ mol-1 H2 and ΔSdes = 151 ± 4 J K-1 mol-1 H2. Hydrogen cycling studies of CaZn11 at 580 °C showed sufficient cycling capacity with no significant sintering occurring during heating, as confirmed by scanning electron microscopy, demonstrating its great potential as a TES material for CSP applications. Finally, a cost comparison study of known destabilized CaH2 systems was carried out to assess the commercial potential.

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