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Hydrogen desorption properties of MgH2-5at% TiCr1.2Fe0.6 nanocomposite synthesized by high-energy mechanical alloying

Mahmoudi, N ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. Publisher: European Powder Metallurgy Association (EPMA) , 2010
  3. Abstract:
  4. We have synthesized nanocrystalline MgH2-5at% TiCr1.2Fe0.6 nanocomposite powder by high-energy mechanical alloying for onboard hydrogen storage application. Magnesium hydride and the elemental Ti, Cr, and Ni powders were milled in a SPEX 800 mill under a high purity argon atmosphere. The dehydrogenation properties of the nanocomposite were studied by simultaneous thermal analyzer. The crystallite size of the nanocomposite was determined by XRD method. It is shown that nanometric grain structure, ultrafine particle size, and the catalytic effect of the transition metals possess a relatively low desorption temperature (262 °C) with 5.5wt % hydrogen release for the nanocomposite powder. The mechanisms of hydrogen desorption and the catalytic effects of mechanical alloying and TiCr1.2Fe0.6 are discussed in this paper
  5. Keywords:
  6. Hydrogen storage materials ; Magnesium hydride ; Nanocomposite ; Dehydrogenation ; Desorption ; Hydrides ; Hydrogen ; Hydrogen storage ; Magnesium ; Mechanical alloying ; Powder metallurgy ; Thermoanalysis ; Titanium ; Dehydrogenation properties ; Desorption temperatures ; Hydrogen desorption ; Nano-composite powders ; Onboard hydrogen storages ; Ultrafine particle sizes
  7. Source: World Powder Metallurgy Congress and Exhibition, World PM 2010, Florence, 10 October 2010 through 14 October 2010 ; Volume 1 , 2010 ; 9781899072194 (ISBN)