Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9759256 | International Journal of Hydrogen Energy | 2005 | 5 Pages |
Abstract
We have improved the H2-sorption properties of Mg by mechanical grinding under H2 (reactive mechanical grinding) with Fe2O3. The sample Mg-10Â wt% Fe2O3 prepared by milling at the revolution speed of 250Â rpm for 6Â h has the best hydrogen-storage properties. It absorbs 3.43Â wt% hydrogen at the first cycle at 593Â K under 12Â bar H2 for 60Â min. Its activation is accomplished after three hydriding-dehydriding cycles. The activated sample absorbs 3.32Â wt% hydrogen at 593Â K, 12Â bar H2 for 60Â 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 increases the H2-sorption rates by making cracks on the surface of Mg particles and reducing the particle size of Mg. The agglomeration of the particles resulting from the annealing effect during cycling decreases the hydriding and dehydriding rates.
Related Topics
Physical Sciences and Engineering
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Electrochemistry
Authors
MyoungYoup Song, IkHyun Kwon, Jong-Soo Bae,