Hydrogen storage performances of as-milled REMg11Ni (RE=Y, Sm) alloys catalyzed by MoS2
(1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;
2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;
3. Department of Mechanical Engineering, Hebei University, Baoding 071002, China)
2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;
3. Department of Mechanical Engineering, Hebei University, Baoding 071002, China)
Abstract: To compare the hydrogen storage performances of as-milled REMg11Ni-5MoS2 (mass fraction) (RE=Y, Sm) alloys, which were catalyzed by MoS2, 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.
Key words: Mg-based alloy; ball milling; catalyst; rare earth element; hydrogen storage performance