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.
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Financial support from the Australian Research Council is gratefully acknowledged.
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Yao, X., Zhu, Z., Cheng, H. et al. Hydrogen diffusion and effect of grain size on hydrogenation kinetics in magnesium hydrides. Journal of Materials Research 23, 336–340 (2008). https://doi.org/10.1557/JMR.2008.0063