Hydrogen desorption properties of MgH 2–TiCr 1.2 Fe 0.6 nanocomposite prepared by high-energy mechanical alloying [electronic resource]

Mahmoudi, N. (Nafiseh) ; Sharif University of Technology

488 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.jpowsour.2011.01.001
  3. Abstract:
  4. In the present work, high-energy mechanical alloying (MA) was employed to synthesize a nanostructured magnesium-based composite for hydrogen storage. The preparation of the composite material with composition of MgH2–5at% (TiCr1.2Fe0.6) was performed by co-milling of commercial available MgH2 powder with the body-centered cubic (bcc) alloy either in the form of Ti–Cr–Fe powder mixture with the proper mass fraction (sample A) or prealloyed TiCr1.2Fe0.6 powder (sample B). The prealloyed powder with an average crystallite size of 14nm and particle size of 384nm was prepared by the mechanical alloying process. It is shown that the addition of the Ti-based bcc alloy to magnesium hydride yields a finer particle size and grain structure after mechanical alloying. As a result, the desorption temperature of mechanically activated MgH2 for 4h decreased from 327°C to 262°C for sample A and 241°C for sample B. A high dehydrogenation capacity (∼5wt%) at 300°C is also obtained. The effect of the Ti-based alloy on improvement of the dehydrogenation is discussed
  5. Keywords:
  6. Hydrogen storage materials ; Magnesium hydride ; Mechanical alloying ; Nanostructures ; Ti–Cr–Fe alloy
  7. Source: Journal of Power Sources ; 2011, Vol. 196, No.10, P.4604-4608
  8. URL: http://cat.inist.fr/?aModele=afficheN&cpsidt=23955978