Article ID Journal Published Year Pages File Type
1616007 Journal of Alloys and Compounds 2012 5 Pages PDF
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 12.5 wt%. The highest reversible capacity of 6.5 wt% of hydrogen was found for the samples with 3 and 5 wt% of additive. The best reaction kinetics was found with 10 wt% of additive: 5.9 wt% H2 was desorbed in 4 min at 300 °C and 0.1 bar of hydrogen pressure. Regardless of the different storage capacities, all the samples were almost fully hydrided in 1 min using a hydrogen pressure of 10 bar at 250 and 300 °C. The enthalpy of formation of magnesium hydride was not affected by the presence of the additive.

► Improvement of hydrogen absorption and desorption kinetics of MgH2 by Zr8Ni21 addition. ► A desorption rate of 3.8 wt%/s is obtained, similar to the best results found in literature. ► A reversible capacity of 6.5 wt% at 300 °C is obtained with 5 wt% additive amount.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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