Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1281930 | International Journal of Hydrogen Energy | 2007 | 8 Pages |
Abstract
Mg-oxide and Mg-oxide-Ni hydrogen storage alloys were prepared by mechanical grinding under H2 (reactive mechanical grinding). Among these alloys, Mg-(7.5wt%Fe2O3, 7.5Â wt%Ni) prepared by grinding for 4Â h with nano-structured Fe2O3 particles and Ni showed the best hydrogen storage properties. The as-milled sample absorbed 4.75Â wt% H at 593Â K under 12Â bar H2 for 60Â min. Its activation was accomplished after two hydriding-dehydriding cycles. The activated sample absorbed 4.36Â wt% H at 593Â K under 12Â bar H2 for 60Â min and desorbed 4.26Â wt% H at 593Â K under 1.0Â bar H2 for 60Â min. After hydriding-dehydriding cycling, Mg2Ni, Fe and MgO are formed. The large bar-like hydrided particles have round and expanding surfaces, suggesting that they expanded during the hydriding reaction, while the dehydrided particles exhibit contracted surfaces with wrinkles.
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Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
MyoungYoup Song, SungNam Kwon, Daniel R. Mumm, Seong-Hyeon Hong,