Abstract
Highly activated MgH 2 was synthesized by ball-milling Mg with Ti 0.4 Cr 0.15 Mn 0.15 V 0.3 alloy under 30 atm hydrogen pressure for 5 h. The catalyzed MgH 2 showed improved absorption/desorption properties, desorbing 6.15 wt.% hydrogen in 100 min at 250 °C and absorbing 5.66 wt.% hydrogen within 150 min even at 80 °C. Scanning and transmission electron microscopy results revealed that the nanosized Ti 0.4 Cr 0.15 Mn 0.15 V 0.3 alloy were embedded in the Mg aggregates, which increase the hydrogen atomic diffusivity in the bulk Mg, resulting in the improved kinetics.
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