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Catalysis and evolution on cycling of nano-structured magnesium multilayer thin films

Fry, Christopher M.P.; Grant, David M.; Walker, Gavin S.

Authors

Christopher M.P. Fry

David M. Grant

Gavin S. Walker

Abstract

This paper explores the hydrogen cycling properties of Mg/Cr and Mg/V multilayer thin films and studies the effect of chromium and vanadium transition metal catalysts on the cycling properties of thick magnesium coatings. Two transition-metal catalysed magnesium-based multilayer PVD coatings are compared with a non-catalysed magnesium control sample. The (micro-)structural evolution of the thin film coatings into fine, flakey powders is studied in depth using XRD, SEM and TEM and the hydrogen storage properties of all three materials are assessed using volumetric, gravimetric and calorimetric methods focussing on the effect of the microstructure and composition of the coatings on the hydrogen storage kinetics. It was found that the chromiumcatalysed coating had the most favourable hydrogen storage kinetics with an activation energy for the dehydrogenation reaction of 65.7±2.5 kJ mol-1 and a hydrogen capacity of 6.1±0.3 wt%. The mechanism of the dehydrogenation reaction of the catalysed samples was studied using the CV and JMAK kinetic models and it was found that the catalyst material influenced not only the hydrogen storage kinetics but also the mechanism of the reaction.

Journal Article Type Article
Publication Date Jan 13, 2014
Journal International Journal of Hydrogen Energy
Print ISSN 0360-3199
Electronic ISSN 0360-3199
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 39
Issue 2
Institution Citation Fry, C. M., Grant, D. M., & Walker, G. S. (2014). Catalysis and evolution on cycling of nano-structured magnesium multilayer thin films. International Journal of Hydrogen Energy, 39(2), doi:10.1016/j.ijhydene.2013.10.136
DOI https://doi.org/10.1016/j.ijhydene.2013.10.136
Keywords Hydrogen storage; Magnesium; Thin film; Chromium; Vanadium; Multilayer
Publisher URL http://www.sciencedirect.com/science/article/pii/S0360319913026517
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0




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