Springer Online Journal Archives 1860-2000
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Abstract Alloys with the general formula La2Mg17-xwt % LaNi5 (x=10, 20, 30 and 40) have been synthesized and the hydrogen storage capacity of these new composite materials investigated. The materials were activated at temperatures of ∼ 360 °C under a hydrogen pressure of ∼ 33 kg cm−2. Optimum storage capacity of 5.24% in terms of pressure and composition was observed for La2Mg17-10 wt% LaNi5 at ∼ 400°C. This is one of the very highest hydrogen storage capacities known so far. The hydriding rate of La2Mg17 in the presence of LaNi5 is about 3–4 times that of La2Mg17 alone. In order to elucidate the role of LaNi5 in accelerating the hydrogen desorption rate of La2Mg17, the structural and microstructural characteristics of the composite material were carried out employing the XRD, SEM and EDAX techniques. The hydriding rate and hydrogen storage capacity are closely related to the microstructure and the types of phase present in the alloys.
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