Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 10, Pages 4604-4608Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2011.01.001
Keywords
Hydrogen storage materials; Magnesium hydride; Mechanical alloying; Nanostructures; Ti-Cr-Fe alloy
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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 MgH2-5 at% (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 14 nm and particle size of 384 nm 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 degrees C to 262 degrees C for sample A and 241 degrees C for sample B. A high dehydrogenation capacity (similar to 5 wt%) at 300 degrees C is also obtained. The effect of the Ti-based alloy on improvement of the dehydrogenation is discussed. (C) 2011 Elsevier B.V. All rights reserved.
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