Revista mexicana de física
Print version ISSN 0035-001X
PALACIOS-LAZCANO, A.F. et al. Hydriding and dehydriding properties of Mg2Ni/Ni and Mg2 Ni/Ni + 5 wt.% Cu prepared by mechanical alloying. Rev. mex. fis. [online]. 2009, vol.55, n.5, pp. 367-372. ISSN 0035-001X.
Elemental powders of Mg, Ni and Cu are subjected to high-energy ball milling in order to produce alloys of nominal compositions Mg2Ni and Mg2Ni0.95Cu0.05. Nanocrystalline phases based on the Mg2Ni structure are produced after 21 hours of milling. As-milled powders were hydrided for 5 min at temperatures of 373, 423 and 473 K, under hydrogen pressures of between 0.69 and 2.07 MPa. The mass loss of the hydrided powders during thermogravimetric analysis was associated with hydrogen release. Maximum amounts of H2 release of 2.9 and 3.1 wt.% were obtained, respectively, for the Mg2Ni and Mg2Ni0.95Cu0.05 samples hydrided at 473 K without prior activation. These are some of the most advantageous results ever reported concerning the behavior of the Mg2Ni phase as a hydrogen storage material.
Keywords : Metal hydrides; hydrogen storage; nanocrystalline magnesium-base alloys; mechanical alloying.