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Hydrogen diffusion and effect of grain size on hydrogenation kinetics in magnesium hydrides

Published online by Cambridge University Press:  31 January 2011

X. Yao ,
Z.H. Zhu ,
H.M. Cheng  and
G.Q. Lu
X. Yao*
Affiliation:
Australian Research Council (ARC) Center for Functional Nanomaterials, University of Queensland, QLD 4072, Australia; and School of Engineering, James Cook University, Townsville, QLD 4811, Australia
Z.H. Zhu
Affiliation:
Australian Research Council (ARC) Center for Functional Nanomaterials, University of Queensland, QLD 4072, Australia
H.M. Cheng
Affiliation:
National Laboratory of Materials Science, Institute of Metals Research, Shenyang 110015, China
G.Q. Lu
Affiliation:
Australian Research Council (ARC) Center for Functional Nanomaterials, University of Queensland, QLD 4072, Australia
*
a) Address all correspondence to this author. e-mail: x.yao@minmet.uq.edu.au
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Abstract

Hydrogenation and dehydrogenation of metal hydrides are of great interest because of their potential in on-board applications for hydrogen vehicles. This paper aims to study hydrogen diffusion in metal hydrides, which is generally considered to be a controlling factor of hydrogenation/dehydrogenation. The present work first calculated temperature-dependent hydrogen diffusion coefficients by a theoretical model incorporated with experimental data in a Mg-based system and accordingly the activation energy. The grain size effect on diffusion in nanoscale was also investigated.

Keywords

HydrogenationMgDiffusion
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 2 , February 2008 , pp. 336 - 340
Copyright
Copyright © Materials Research Society 2007

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References

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