The cycle stability of Mg-based nanostructured materials

Two nanostructured Mg-based composites MgH 2–5 wt.% LaNi 5–5 wt.% Ti and MgH 2–5 wt.% TiFeMn–5 wt.% V have been synthesised by ball milling with a milling time of 40 h. The influence of prolonged cycling on the hydriding/dehydriding properties has been investigated by more than 500 absorption–desorption cycles using the isobaric method. Upon cycling, MgH 2–5 wt.% LaNi 5–5 wt.% Ti showed very good stability both in kinetics and in storage capacity. For the material MgH 2–5 wt.% TiFeMn–5 wt.% V, the absorption kinetics slowed down continuously during cycling, whereas the desorption kinetics hardly changed.