Effect of CNT Addition on the Hydriding and Dehydriding Rates of Mg-Ni-Fe2O3 Alloy

Samples with compositions of 80 wt% Mg-14 wt% Ni-6 wt% Fe2O3 (named Mg-Ni-Fe2O3), and 78 wt% Mg-14 wt% Ni-6 wt% Fe2O3-2 wt% CNT (named Mg-Ni-Fe2O3-CNT) were prepared by reactive mechanical grinding. Hydriding and dehydriding properties and effects of CNT addition on the hydriding and dehydriding rates of Mg-Ni-Fe2O3 were then investigated. Activation of the Mg-14Ni-6Fe(2)O(3) sample was completed after three hydriding (under 12 bar H-2)-dehydriding (under 1.0 bar H-2) cycles at 573 K. The addition of CNT to the Mg-14Ni-6Fe(2)O(3) sample made the activation process unnecessary, with a small decrease in the hydrogen-storage capacity.