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Hydrogen storage cycling of MgH2 thin film nanocomposites catalyzed by bimetallic Cr Ti

Source: Appl. Phys. Lett. 97, 083106 (2010); doi:10.1063/1.3479914

Published 26 August 2010

KEYWORDS and PACS
Keywords
PACS
  • 88.30.rd
    Inorganic metal hydrides
  • 65.40.G-
    Other thermodynamical quantities of crystalline solids
  • YEAR: 2010
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PUBLICATION DATA
ISSN:
1553-9644 (online)
Publisher:
AIP is a member of CrossRef AIP
Beniamin Zahiri, Babak Shalchi Amirkhiz, and David Mitlin
Chemical and Materials Engineering, National Institute for Nanotechnology, University of Alberta and National Research Council Canada, Edmonton, Alberta, Canada
We examine hydrogen sorption cycling of 1.5  µm thick magnesium thin films containing a bimetallic chromium titanium catalyst. At 200 °C these nanocomposites absorb 5  wt % hydrogen in several seconds, and desorb in 10–20 minutes. In several compositions, there is negligible hydrogenation kinetics or capacity degradation even at over 100 cycles. Equally importantly, the ternary films require minimal activation, achieving rapid magnesium hydride formation and decomposition from cycle one. Pressure-composition isotherms display well-known enthalpies of MgH2. Transmission electron microscopy analysis supports a hypothesis that such extreme kinetics is due to the presence of a nanodispersed Cr Ti phase in Mg matrix. ©2010 American Institute of Physics
History: Received 22 June 2010; accepted 26 July 2010; published 26 August 2010
Permalink: http://link.aip.org/link/?APPLAB/97/083106/1

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