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    Hydrogen absorption kinetics and structural features of NaA1H4 enhanced with transition meal-and Ti-based nanoparticles

    Access Status
    Fulltext not available
    Authors
    Pitt, M.
    Vullum, P.
    Sorby, M.
    Emerich, H.
    Paskevicius, Mark
    Webb, C.
    Gray, E.
    Buckley, Craig
    Walmsley, J.
    Holmestad, R.
    Hauback, B.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Pitt, M.P. and Vullum, P.E. and Sorby, M.H. and Emerich, H. and Paskevicius, M. and Webb, C.J. and Gray, E.MacA. and Buckley, C.E. and Walmsley, J.C. and Holmestad, R. and Hauback, B.C. 2012. Hydrogen absorption kinetics and structural features of NaA1H4 enhanced with transition meal-and Ti-based nanoparticles. International Journal of Hydrogen Energy. 37 (20): pp. 15175-15186.
    Source Title
    International Journal of Hydrogen Energy
    DOI
    10.1016/j.ijhydene.2012.08.014
    ISSN
    0360-3199
    URI
    http://hdl.handle.net/20.500.11937/10795
    Collection
    • Curtin Research Publications
    Abstract

    The hydrogen cycled (H) planetary milled (PM) NaAlH4 + xM (x < 0.1) system (M = 30 nm Ag, 80 nm Al, 2–3 nm C, 30 nm Cr, 25 nm Fe, 30 nm Ni, 25 nm Pd, 65 nm Ti) has been studied by high resolution synchrotron powder X-ray diffraction. Isothermal absorption kinetic isotherms have been measured over the first two H cycles. The PM NaAlH4 + 0.1Ti system has also been studied by high resolution transmission electron microscopy (TEM). 80 nm Al and 2–3 nm C were inactive, and would not allow hydrogen (H) desorption from NaAlH4. 30 nm Cr, 25 nm Fe, 30 nm Ni, and 25 nm Pd showed activity, but with weak kinetics of only ca. 1 wt.% H/hour. The NaAlH4 + 0.1Ti system displays absorption kinetics of ca. 7 wt.% H/hour, comparable to TiCl3 enhanced NaAlH4 after five H cycles. After H cycling the PM NaAlH4 + 0.1Ti system, we observe a body centred tetragonal (bct) χ-TiH2 phase, which displays intense anisotropic peak broadening. The broadening is evident as a massive dislocation density of ca. 1.20 × 1017/m2 in high resolution TEM images of the χ-TiH2 phase. All originally added Ti can be accounted for in the bct χ-TiH2 phase by quantitative phase analysis (QPA) after five H cycles. The PM NaH + Al + 0.02 (Ti-nano-alloy) system shows absorption kinetic rates in the order TiO2 > TiN > TiC > Ti, with rapid hydrogenation kinetics of ca. 23 wt.% H/hour for TiO2 enhanced NaAlH4, equivalent to TiCl3 enhanced NaAlH4. The TiN and TiC are partially reduced by ca. 7 and 22% respectively, and the TiO2 is completely reduced. The location of the reduced Ti cannot be discerned by X-ray diffraction at these minor proportions.

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