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    Cycle life and hydrogen storage properties of mechanical alloyed Ca1-xZrxNi5-yCry; (x=0, 0.05 and y=0, 0.1)

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    Fulltext not available
    Authors
    Chumphongphan, Somwan
    Paskevicius, Mark
    Sheppard, Drew
    Buckley, Craig
    Date
    2012
    Type
    Journal Article
    
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    Citation
    Chumphongphan, S. and Paskevicius, M. and Sheppard, D. and Buckley, C. 2012. Cycle life and hydrogen storage properties of mechanical alloyed Ca1-xZrxNi5-yCry; (x=0, 0.05 and y=0, 0.1). International Journal of Hydrogen Energy. 37 (9): pp. 7586-7593.
    Source Title
    International Journal of Hydrogen Energy
    DOI
    10.1016/j.ijhydene.2012.01.131
    ISSN
    0360-3199
    School
    Centre for Fuels and Energy (COE)
    URI
    http://hdl.handle.net/20.500.11937/17180
    Collection
    • Curtin Research Publications
    Abstract

    CaNi5–based alloys have been synthesized by mechanical alloying followed by isothermal annealing. The formation of the CaNi5 structure occurred when the milled powders were heated at 800 °C under vacuum for 3 h. The abundance of CaNi5 phase in the alloys ranges from 60 to 70 wt.%. Replacement of Zr into the Ca site reduces the unit cell volume of CaNi5 whilst replacement of Cr into the Ni site slightly increases the unit cell volume. The hydrogen storage capacity of all substituted alloys is decreased and the hydrogen sorption plateau regions are narrowed compared to those of pure CaNi5. Substitution of Zr into the Ca site extinguishes the flat plateau region unlike replacement of Cr into the Ni site where a flat plateau is maintained. The reaction enthalpy ΔH for both absorption and desorption are directly proportional to the unit cell volume of the alloys. The hydrogen storage capacity of all alloys rapidly decays for the first 50 cycles at 85 °C followed by a more gradual decline after 50 further cycles. The hydrogen storage capacity of the alloys after 200 cycles is in the range of 65–75% of the initial capacity.

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