0000000000321980
AUTHOR
A Girella
Ball milling and AlB2 addition effects on the hydrogen sorption properties of the CaH2 + MgB2 system
Among the borohydrides proposed for solid state hydrogen storage,Ca(BH4)2 is particularly interesting because of its favourable thermodynamics and relatively cheap price.Composite systems,whereother species are present in addition to the borohydride,show some advantages in hydrogen sorption properties with respect to the borohydrides alone,despite a reduction of the theoretical storage capacity. We have investigated the milling time influence on the sorption properties of the CaH2 +MgB2 system from which Ca(BH4)2 and MgH2 can be synthesized by hydrogen absorption process.Manometric and calorimetric measurements showed better kinetics forlong time milled samples.We found that the total subst…