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Improvement of Hydrogen Desorption Characteristics of MgH2 With Core-shell [email protected] Composites

by Cuihua An and Qibo Deng *
Tianjin Key Laboratory of Advanced Functional Porous Materials, Institute for New Energy Materials & Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, NO.391 Binshui West Street Xiqing District, Tianjin 300384, China
*
Author to whom correspondence should be addressed.
Molecules 2018, 23(12), 3113; https://doi.org/10.3390/molecules23123113
Received: 15 November 2018 / Revised: 25 November 2018 / Accepted: 26 November 2018 / Published: 28 November 2018
(This article belongs to the Special Issue Advances in Hydrogen Storage Materials Research)
Magnesium hydride (MgH2) has become popular to study in hydrogen storage materials research due to its high theoretical capacity and low cost. However, the high hydrogen desorption temperature and enthalpy as well as the depressed kinetics, have severely blocked its actual utilizations. Hence, our work introduced [email protected] materials with a core-shell structure to synthesize MgH2-x wt.% [email protected] composites for improving the hydrogen desorption characteristics. The influences of the [email protected] addition on the hydrogen desorption performances and micro-structure of MgH2 have been well investigated. The addition of [email protected] can effectively improve the dehydrogenation kinetics. It is interesting found that: i) the hydrogen desorption kinetics of MgH2 were enhanced with the increased [email protected] additive amount; and ii) the dehydrogenation amount decreased with a rather larger [email protected] additive amount. The additive amount of 4 wt.% [email protected] has been chosen in this study for a balance of kinetics and amount. The MgH2-4 wt.% [email protected] composites release 5.9 wt.% of hydrogen in 5 min and 6.6 wt.% of hydrogen in 20 min. It reflects that the enhanced hydrogen desorption is much faster than the pure MgH2 materials (0.3 wt.% hydrogen in 20 min). More significantly, the activation energy (EA) of the MgH2-4 wt.% [email protected] composites is 112 kJ mol−1, implying excellent dehydrogenation kinetics. View Full-Text
Keywords: magnesium hydride; dehydrogenation kinetics; [email protected] core-shell nanostructure; hydrogen storage materials; catalytic effect magnesium hydride; dehydrogenation kinetics; [email protected] core-shell nanostructure; hydrogen storage materials; catalytic effect
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An, C.; Deng, Q. Improvement of Hydrogen Desorption Characteristics of MgH2 With Core-shell [email protected] Composites. Molecules 2018, 23, 3113.

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