| Abstract |
| In this work, MgH2, which is brittle, and Ni-coated carbon were added to Mg in order to improve the hydrogen absorption and release properties of magnesium. Carbon has a relatively low density, and it is thus considered that the interfacial area between Mg and an added catalyst will increase when Ni-coated carbon is added to Mg. In this research, the quantity of added Ni-coated carbon was smaller than that in the previously reported studies. A mixture with a composition of 85 wt% Mg+10 wt% MgH2+5 wt% (Ni-coated carbon) was milled in a hydrogen atmosphere in a planetary ball mill (alloyed mechanically in a hydrogen atmosphere). The hydrogen absorption and release properties of the prepared sample were investigated. Mechanical alloying in a hydrogen atmosphere of Mg with MgH2 and Ni-coated carbon and hydrogen absorption-release cycling are believed to create defects on the surface and in the inside of the Mg particle, to make clean surfaces, to increase the interfacial area between Mg and additives, and to diminish the particle size of Mg. The sample released 0.03 wt% H for 2 min, 1.50 wt% H for 9 min, 2.69 wt% H for 16 min, and 2.86 wt% H for 60 min at 648 K under an initial hydrogen pressure of 0 bar.(Received May 8, 2015) |
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| Key Words |
| hydrogen absorbing materials, mechanical alloyin g/milling, scanning electron microscopy, SEM, X-ray diffraction, 85Mg+10MgH2+5(Ni-coated carbon). |
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