Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9803697 | Journal of Alloys and Compounds | 2005 | 5 Pages |
Abstract
We tried to improve the H2-sorption properties of Mg by mechanical grinding under H2 (reactive mechanical grinding) with Fe2O3 under various milling conditions. The sample Mg-10Â wt.%Fe2O3 prepared by milling at a revolution speed of 250Â rpm for 24Â h has the best hydrogen-storage properties. It absorbs 5.05Â wt.% hydrogen at 593Â K under 12Â bar H2 for 60Â min at the first cycle. Its activation is accomplished after three hydriding-dehydriding cycles. The activated sample absorbs 4.22Â wt.% hydrogen at 593Â K, 12Â bar H2 for 10Â min. The reactive grinding of Mg with Fe2O3 increases the H2-sorption rates by facilitating nucleation (by creating defects on the surface of the Mg particles and by the additive), by making cracks on the surface of Mg particles and reducing the particle size of Mg and thus by shortening the diffusion distances of hydrogen atoms. Hydriding-dehydriding cycling also increases the H2-sorption rates by creating defects on the surface of the Mg particles, and by making cracks on the surface of Mg particles and reducing the particle size of Mg.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Ik-Hyun Kwon, Jean-Louis Bobet, Jong-Soo Bae, Myoung-Youp Song,