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Destabilization of Mg Hydride by Self-Organized Nanoclusters in the Immiscible Mg-Ti System
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
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2015 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 119, no 22, 12157-12164 p.Article in journal (Refereed) Published
Abstract [en]

Mg is an attractive hydrogen storage material not only because of its high gravimetric and volumetric hydrogen capacities but also because of it low material costs. However, the hydride of MgH2 is too stable to release hydrogen under moderate conditions. We demonstrate that the formation of nanometer-sized clusters of Mg reduces the stability of MgH2 by the interface energy effect in the immiscible Mg-Ti system. Ti-rich MgxTi1-x (x < 0.5) thin films deposited by magnetron sputtering have a hexagonal close packed (HCP) structure, which forms a face-centered cubic (FCC) hydride phase upon hydrogenation. Positron Doppler broadening depth profiling demonstrates that after hydrogenation, nanometer-sized MgH2 clusters are formed which are coherently embedded in an FCC TiH2 matrix. The P (pressure)-T (optical transmission) isotherms measured by hydrogenography show that these MgH2 clusters are destabilized. This indicates that the formation of nanometer-sized Mg allows for the development of a lightweight and cheap hydrogen storage material with a lower desorption temperature.

Place, publisher, year, edition, pages
2015. Vol. 119, no 22, 12157-12164 p.
National Category
Chemical Sciences Nano Technology
URN: urn:nbn:se:uu:diva-257656DOI: 10.1021/acs.jpcc.5b02275ISI: 000355891600007OAI: oai:DiVA.org:uu-257656DiVA: diva2:840254
Available from: 2015-07-07 Created: 2015-07-06 Last updated: 2015-07-07Bibliographically approved

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Mooij, Lennard P. A.
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