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Permanent link (DOI): https://doi.org/10.7939/R3CH9V

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Tailoring sorption properties of nano-sized multilayer structured magnesium for hydrogen storage Open Access

Descriptions

Other title
Subject/Keyword
Hydrogen storage
Magnesium hydride
Multilayer thin films
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Zahiri Sabzevar, Ramin
Supervisor and department
Mitlin, David (Chemical and Materials Engineering)
Examining committee member and department
Zeng, Hongbo (Chemical and Materials Engineering)
Liu, Qi (Chemical and Materials Engineering)
Elias, Anatasia (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Materials Engineering
Date accepted
2012-09-28T06:40:07Z
Graduation date
2012-09
Degree
Master of Science
Degree level
Master's
Abstract
To tailor the hydrogen sorption properties of magnesium, improve its poor kinetics and alter its thermodynamics properties, sputtered multilayer Mg-based thin films were prepared in which Mg layers were confined by AlTi layers. Multilayer samples of different Mg thickness showed relatively long activation periods compared to the conventional co-sputtered alloys thin films. This activation period is attributed to the formation of voids and new surfaces which facilitate hydrogen transportation and its interaction with base metal. It has been found that the cyclability performance of materials is strictly connected to the stability of microstructure and resistance of multilayer structure to grain growth. At a certain Mg:AlTi thickness ratio (10:2), sintering of Mg layer could be prevented and long cyclability over 250 cycles has been achieved. Multilayers of few nm Mg thicknesses possess equilibrium pressures higher than pure Mg and the plateau pressure is a function of Mg thickness.
Language
English
DOI
doi:10.7939/R3CH9V
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
R, Zahiri, B. Zahiri, A. Kubis, P. Kalisswart, B. Amirkhiz and D. Mitlin, “Microstructural evolution during low temperature sorption cycling of Mg-AlTi multilayer nanocomposites”, International Journal of Hydrogen Energy, Volume 37, Issue 5, pg 4215-4226, 2012

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