Hydrogen storage performances of as-milled REMg11Ni (RE=Y, Sm) alloys catalyzed by MoS2

Abstract To compare the hydrogen storage performances of as-milled REMg 11 Ni-5MoS 2 (mass fraction) (RE=Y, Sm) alloys, which were catalyzed by MoS 2 , the corresponding alloys were prepared. The hydrogen storage performaces of these alloys were measured by various methods, such as XRD, TEM, automatic Sievert apparatus, TG and DSC. The results reveal that both of the as-milled alloys exhibit a nanocrystalline and amorphous structure. The RE=Y alloy shows a larger hydrogen absorption capacity, faster hydriding rate, lower initial hydrogen desorption temperature, superior hydrogen desorption property, and lower hydrogen desorption activation energy, which is thought to be the reason of its better hydrogen storage kinetics, as compared with RE=Sm alloy.