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Controlling Hysteresis of Metal-hydride Transformations in Epitaxial Thin Films

Published online by Cambridge University Press:  17 July 2013

Brad M. Boyerinas ,
Hugh A. Bruck  and
Alexander L. Roytburd
Brad M. Boyerinas
Affiliation:
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
Hugh A. Bruck
Affiliation:
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
Alexander L. Roytburd
Affiliation:
Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
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Abstract

Metal hydrides present a feasible means of energy storage and hydrogen sensing but have several performance criteria that must be addressed, including the hysteresis effect during hydrogen loading and unloading. We present the results of a theoretical and experimental study which demonstrates the possibility to control or eliminate hysteresis during metal-hydride transformation in epitaxial Pd thin films. Theoretical analysis predicts stabilization of two-phase metal-hydride state in film due to its elastic interaction with the substrate. It is shown, by atomic force and scanning electron microscopy, that transformation in 100nm thick epitaxial Pd films on Al2O3 substrate proceeds by the formation of transversely modulated two-phase nanostructure. Morphology and crystallographic orientation of the metal-hydride interface corresponds to the theoretically predicted characteristics of coherent phases.

Keywords

hydrogenationthin filmepitaxy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1581: Symposium CCC – Novel Functionality by Reversible Phase Transformation , 2013 , mrss13-1581-ccc02-07
Copyright
Copyright © Materials Research Society 2013 

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References

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