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Nanocrystalline Mg-based hydrides for hydrogen storage

Published online by Cambridge University Press:  21 March 2011

W. Oelerich ,
T. Klassen  and
R. Bormann
W. Oelerich
Affiliation:
GKSS Research Center Geesthacht GmbH, Inst. for Materials Research Max-Planck-Strasse D-21502 Geesthacht, Germany
T. Klassen
Affiliation:
GKSS Research Center Geesthacht GmbH, Inst. for Materials Research Max-Planck-Strasse D-21502 Geesthacht, Germany
R. Bormann
Affiliation:
GKSS Research Center Geesthacht GmbH, Inst. for Materials Research Max-Planck-Strasse D-21502 Geesthacht, Germany
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Abstract

Hydrogen is the ideal means of energy storage for transportation and conversion of energy in a comprehensive clean-energy concept. However, appropriate storage facilities, both for stationary and for mobile applications, are complicated, because of the very low boiling point of hydrogen (20.4 K at 1 atm) and its low density in the gaseous state (90 g/m3). Furthermore, the storage of hydrogen in liquid or gaseous form imposes safety problems, in particular for mobile applications, e.g. the future zero-emission vehicle. Metal hydrides are a safe alternative for H-storage and, in addition, have a high volumetric energy density that is about 60% higher than that of liquid hydrogen. Mg hydride has a high storage capacity by weight and is therefore favoured for automotive applications. However, so far light metal hydrides have not been considered competitive because of their rather sluggish sorption kinetics. Filling a tank could take several hours. Moreover, the hydrogen desorption temperature of about 300 °C is rather high for most applications. A breakthrough in hydrogen storage technology was achieved by preparing nanocrystalline hydrides using high-energy ball milling. These new materials show very fast aband desorption kinetics within few minutes, thus qualifying lightweight Mg-based hydrides for storage application. In this paper recent detailed results on the sorption behaviour of nanocrystalline Mg and Mg-based alloys are presented. In a following research effort the sorption kinetics of nanocrystalline Mg has been further enhanced by catalyst additions. Furthermore, different transition metals have been added to Mg to achieve a thermodynamic destabilisation of the hydride, thus lowering the desorption temperatures to about 230 °C. The newly developed materials are currently being tested in prototype storage tanks.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 676: Symposium Y – Synthesis, Functional Properties and Applications of Nanostructures , 2001 , Y4.5
Copyright
Copyright © Materials Research Society 2001

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