Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1279846 | International Journal of Hydrogen Energy | 2008 | 9 Pages |
Commercial MgH2 powder was mechanically (ball) milled without and with nanosized Cr2O3 particles in different types of ball mills using various milling conditions. The results demonstrate that the high-energy ball milling greatly improves the hydrogen absorption/desorption kinetics of MgH2. There is no significant difference in the sorption properties between powders milled in different commonly used mills. It was noticed that samples ball-milled in a planetary ball mill show improved desorption kinetics. In this study very favorable effect of Cr2O3 nanoparticles on hydrogen sorption kinetics was observed. The crystallite size of ββ-MgH2 after milling without or with nano-Cr2O3 is almost the same (∼10nm). In contrast to that, the specific surface area of MgH2 powder after milling with nanosized Cr2O3 decreases significantly as compared to the powder milled without catalyst.