Abstract
Hydrogen absorption and desorption kinetics, and thermodynamics of MgH2 ball milled with addition of the Zr8Ni21 alloy have been studied. Different additive amounts were used from 3 to 12.5wt%. The highest reversible capacity of 6.5wt% of hydrogen was found for the samples with 3 and 5wt% of additive. The best reaction kinetics was found with 10wt% of additive: 5.9wt% H2 was desorbed in 4min at 300°C and 0.1bar of hydrogen pressure. Regardless of the different storage capacities, all the samples were almost fully hydrided in 1min using a hydrogen pressure of 10bar at 250 and 300°C. The enthalpy of formation of magnesium hydride was not affected by the presence of the additive.
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