%0 Journal Article
%T Study of hydrogen absorption kinetics of Mg2Ni-based powders produced by high-injected shock power mechanical alloying and subsequent annealing
%A Moomen Marzouki
%A Ouassim Ghodbane
%A Mohieddine Abdellaoui
%J Materials for Renewable and Sustainable Energy
%@ 2194-1467
%D 2013
%I 
%R 10.1007/s40243-013-0009-y
%X Mg2Ni-based compounds were prepared using a high-energy milling technique, with a planetary ball mill, and subsequent annealing at 350 ¡ãC. X-ray diffraction analyses revealed that Mg2Ni phase was obtained after 10 milling hours, in addition to Ni phase. Increasing the ball-milling duration from 10 to 17 h causes a decrease in the crystal size of particles from 93 to 76 nm. However, the subsequent annealing of all Mg2Ni-based materials highly increases their crystallite sizes with calculated values in the range of 261¨C235 nm. In the same way, X-ray diffraction patterns of annealed compounds show the presence of highly crystallized Mg2Ni phases. The particle size of Mg2Ni/Ni particles is estimated at 25 ¦Ìm after 10 milling hours and drops to 5 ¦Ìm at longer times. The scanning electron microscopy images of Mg2Ni/Ni particles demonstrated a drastic increase of their sizes up to 100 ¦Ìm upon annealing. The hydrogenation reactivity and kinetic of Mg2Ni/Ni were both characterized by solid¨Cgas reactions. The hydrogen absorption capacity value was about 3.5 H/f.u for milled and annealed Mg2Ni/Ni compound. The highest hydrogen absorption kinetic was obtained during the first 5 h of absorption time, where 95 % of the maximum absorption capacity was reached.
%K Mg2Ni-based compounds
%K Mechanical alloying
%K X-ray diffraction
%K Hydrogen absorption kinetic
%K Annealing treatment
%U http://link.springer.com/article/10.1007/s40243-013-0009-y