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

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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.

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Acknowledgment

Financial support from the Australian Research Council is gratefully acknowledged.

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Authors and Affiliations

  1. Australian Research Council (ARC) Center for Functional Nanomaterials, University of Queensland, QLD, 4072, Australia

    X. Yao, Z.H. Zhu & G.Q. Lu

  2. School of Engineering, James Cook University, Townsville, QLD, 4811, Australia

    X. Yao

  3. Institute of Metals Research, National Laboratory of Materials Science, Shenyang, 110015, China

    H.M. Cheng

Authors
  1. X. Yao
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  2. Z.H. Zhu
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  3. H.M. Cheng
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  4. G.Q. Lu
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Correspondence to X. Yao.

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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

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  • DOI: https://doi.org/10.1557/JMR.2008.0063

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