For the future zero-emission vehicle, hydrogen is of great importance as alternative fuel. For both combustion engines as well as fuel cells, the storage of hydrogen in liquid or gaseous form imposes safety problems. Metal hydrides are a safe alternative for H-storage and, in addition, have a higher volumetric energy density. Mg hydride has a high storage capacity by weight and is therfore favored for automotive applications. However, a major drawback is the high desorption temperature of about 300 deg C, whereas 180 deg C is requested for application. Moreover, hydrides have not been considered competitive because of their rather sluggish sorption kinetics, that was mainly diffusion controlled. In the paper, sorption kinetics and storage capacity of Mg-based hydrides are presented. Hydriding and dehydriding kinetics can be greatly enhanced by refining the microstructure using ball milling. Furthermore, thermodynamic properties can be improved by alloying Mg with other metals.
Nanocrystalline Mg-based alloys for hydrogen storage
1998
5 Seiten, 9 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
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