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    Complex transition metal hydrides incorporating ionic hydrogen: Thermal decomposition pathway of Na2Mg2FeH8 and Na2Mg2RuH8

    Access Status
    Open access via publisher
    Authors
    Humphries, Terry
    Matsuo, M.
    Li, G.
    Orimo, S.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Humphries, T. and Matsuo, M. and Li, G. and Orimo, S. 2015. Complex transition metal hydrides incorporating ionic hydrogen: Thermal decomposition pathway of Na2Mg2FeH8 and Na2Mg2RuH8. Physical Chemistry Chemical Physics. 17 (12): pp. 8276-8282.
    Source Title
    Physical Chemistry Chemical Physics
    DOI
    10.1039/c5cp00258c
    ISSN
    1463-9076
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/35512
    Collection
    • Curtin Research Publications
    Abstract

    Complex transition metal hydrides have potential technological application as hydrogen storage materials, smart windows and sensors. Recent exploration of these materials has revealed that the incorporation of anionic hydrogen into these systems expands the potential number of viable complexes, while varying the countercation allows for optimisation of their thermodynamic stability. In this study, the optimised synthesis of Na2Mg2TH8 (T = Fe, Ru) has been achieved and their thermal decomposition properties studied by ex situ Powder X-ray Diffraction, Gas Chromatography and Pressure-Composition Isotherm measurements. The temperature and pathway of decomposition of these isostructural compounds differs considerably, with Na2Mg2FeH8 proceeding via NaMgH3 in a three-step process, while Na2Mg2RuH8 decomposes via Mg2RuH4 in a two-step process. The first desorption maxima of Na2Mg2FeH8 occurs at ca. 400 °C, while Na2Mg2RuH8 has its first maxima at 420°C. The enthalpy and entropy of desorption for Na2Mg2TH8 (T = Fe, Ru) has been established by PCI measurements, with the ?Hdes for Na2Mg2FeH8 being 94.5 kJ mol-1 H2 and 125 kJ mol-1 H2 for Na2Mg2RuH8. This journal is

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