Research on Preparation and Hydrogen Storage Properties of Mg_2Ni Hydrogen Storage Alloys

Considerable attention has been paid to Mg-Ni based hydrogen storage alloys because of their high capacity and low cost.The Mg_(2)Ni alloys have been successfully synthesized under 900 ℃ by means of a metallurgical method in an induction furnace.The studies of X-ray diffraction and metallorgraphic structure reveal that there are pricipally Mg_(2)Ni phases in the alloys.The measurements of the hydrogen storage properties for the alloys have been carried out.The results show that the hydrogen storage capacities of 3.14 wt% and 3.49 wt% of the alloy powders are observed after the first and the second activation respectivelly.The latter is closed to the maximum of hydrogen storage capacity of Mg_(2)Ni.The hydrogen storage capacity of the bulk samples is much less than the alloy powders after the second activation and there is not obviously increase in hydrogen storage capacity of the samples after the third activation.