Investigation of hydrogen storage of Mg-based nanocomposite materials alloysMg-Ni-LaNi5

摘要

The composite material of Mg,-Ni,-LaNi5, was prepared using the mechanical alloying process under the protection of high purity argon atmosphere and these materials were characterized for their phase compositions, crystal structure, grain size and distribution of catalyst element by X-ray diffraction (XRD) and scanning electron microscope (SEM). Hydrogen storage capacities and the hydridingdehydriding kinetics of the materials were measured between 100-300°C using a Sieverts apparatus. The amounts of hydrogen absorbed and desorbed are presented in relation to the change of hydrogen atmospheric pressures by-using the ideal gas law in weight percentage (wt. %). Ball milling between 8-24 h for processing Mg-based nanostrucrured material was performed to obtain a nanostructured and hydrogenated final product. The hydriding-dehydriding kinetics and capacity of Mg based composite materials were investigated by the addition of metal catalysts and increasing ball milling time. A high hydrogen absorption and desorption was obtained as 2.14 and 1,90 wt.% for the weight percentages of Mg, Ni and LaNi5 of 85, 5 and 10, respectively, at 100°C within 15 min. The average grain size of the composite material was 13.10 nm for 24 h.