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Effects of ball-milling conditions and additives on the hydrogen sorption properties of Mg + 5 wt% Cr2O3 mixtures

Published online by Cambridge University Press:  01 July 2006

J-L. Bobet ,
M. Kandavel  and
S. Ramaprabhu
J-L. Bobet*
Affiliation:
ICMCB, CNRS [UPR 9048], Université Bordeaux 1, 33608 Pessac cedex, France
M. Kandavel
Affiliation:
Alternate Energy Technology and Magnetic Materials Laboratory, Department of Physics, Indian Institute of Technology, Madras, Chennai-600 036, India
S. Ramaprabhu
Affiliation:
Alternate Energy Technology and Magnetic Materials Laboratory, Department of Physics, Indian Institute of Technology, Madras, Chennai-600 036, India
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Effects of particle size of Cr2O3 catalyst on the hydrogen absorption/desorption kinetics of Mg + 5 wt% Cr2O3 mixtures have been studied. To explain the effect of particle size of Cr2O3 and also to yield information about the role of Cr2O3 during the sorption process, the kinetics data have been analyzed using Avrami–Erofeev rate equations. The activation energies and diffusion coefficients of these mixtures are in the ranges of 50.6–63.2 kJ/mol and 1.2.10−11 to 8.9.10−10 cm2/s, respectively. The addition of nano-oxides led to an increase of the diffusion coefficient of hydrogen by one order of magnitude.

Keywords

Energy storageMechanical alloyingMg
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 7 , July 2006 , pp. 1747 - 1752
Copyright
Copyright © Materials Research Society 2006

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References

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