Influences of the Addition of Hydride-Forming Elements and Oxide and Hydriding-Dehydriding Cycling on the Hydriding and Dehydriding Characteristics of Mg

Magnesium prepared by mechanical grinding under H-2 (reactive mechanical grinding) with transition elements or oxides showed relatively high hydriding and dehydriding rates when the content of additives was about 20 wt%. Ni was chosen as a transition element to be added. Fe2O3 was selected as an oxide to be added. Ti was also selected since it was considered to increase the hydriding and dehydriding rates by forming Ti hydride. A sample Mg-14Ni-3Fe(2)O(3)-3Ti was prepared by reactive mechanical grinding, and its hydrogen storage properties were examined. This sample absorbs 4.02 wt% H for 5 min, and 4.15 wt% H for 10 min, and 4.42 wt% H for 60 min at n = 2. It desorbs 2.46 wt% H for 10 min, 3.98 wt% H for 30 min, and 4.20 wt% H for 60 min at n = 2. The effects of the Ni, 3Fe(2)O(3), and Ti addition, and hydriding-dehydriding cycling were discussed.