On the hydrogen desorption entropy change of modified MgH2

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Cui, Jie
Ouyang, Liuzhang
Wang, Hui
Yao, Xiangdong
Zhu, Min
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2018
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http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract

Reducing hydrogen desorption temperature (Td) is a current challenge for application of Mg-based hydrogen storage alloys. The equilibrium Td is directly determined by the thermodynamics, characterized by the enthalpy (ΔH) and the entropy (ΔS), of hydrogen desorption reaction of MgH2. While the change of ΔH has been proved due to the size effect and alloying effect, the ΔS is customary considered as entropy of H2, being a constant of 130.5 Jmol-1·K−1. Very recently, however, the ΔS is experimentally reported to change in some cases as well. In this work, for the first time, we proposed a model to illustrate theoretically that the vary of ΔS, which significantly influences the Td, of MgH2 with the changing particle/grain size, covering catalyst on surface and forming solid solution of MgH2 that facilitates the hydrogen molecule dissociation. The model is supported by the experimental results.

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Journal of Alloys and Compounds
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© 2018 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence (http://creativecommons.org/licenses/by-nc-nd/4.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
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Condensed matter physics
Materials engineering
Materials engineering not elsewhere classified
Resources engineering and extractive metallurgy
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