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HomeSolid State PhenomenaSolid State Phenomena Vol. 194Relationship between Micro-/Nano-Structure and...

Relationship between Micro-/Nano-Structure and Stress Development in TM-Doped Mg-Based Alloys Absorbing Hydrogen

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Abstract:

In the most recent years, MgH₂ has attracted considerable attention for reversible hydrogen storage purposes because of a large 7.6 w% H-uptake, single plateau reaction at low pressure and abundance of metal. If the Mg ↔ H reactions take place at rather high temperature (> 300°C), the kinetic remains very low. However, early transition metal based additives (Ti, V, Nb...) improve dramatically the kinetics of hydrogen absorption/desorption, while having no essential impact on the reversible sorption capacity. Systematic analysis of many experimental data led to question chemical, physical, mechanical... parameters contributing significantly to improve the kinetics of absorption/desorption. Besides, results of theoretical and numerical computation enlighten the impact of structural and mechanical parameters owing to the local bonds of Mg/MgH₂ with of TM elements, in terms of total energy and electronic structure. More specifically, we found highly relevant to consider 1 - the impact of the crystallite sizes of Mg and the TM-phase, 2 - the role of internal and external stresses, as well as 3 - the role of texture on the kinetics of hydrogen absorption/desorption. Apart the previous considerations, we like to underline the role of specific TM in trapping intermediately hydrogen thus forming TMH_x prior initiating the Mg ↔ MgH₂ nucleation process.

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Solid State Phenomena (Volume 194)

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237-244

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.194.237

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Online since:

November 2012

Authors:

N.E. Skryabina, Vladimir M. Pinyugzhanin, Daniel Fruchart

Keywords:

Catalyst Additives, Hydrogenation Kinetics, Interface, Mg Based Hydrides, Stress

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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