Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 33, Issue 15, Pages 4122-4131Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2008.05.083
Keywords
hydrogen storage; nanotechnology; nanostructure; enthalpy; thermodynamics; excess volume; metal hydride
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Funding
- DOE [DE-FG02-OSER46241]
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High-energy ball milling has been shown to decrease the release temperature, increase the reaction kinetics, and lower the enthalpy of formation of metal hydrides in certain cases. This paper discusses several potential mechanisms for the reduction of the enthalpy of formation. Although the increased surface and grain boundary energy could play a role in reducing the enthalpy of formation, the predicted magnitude is too small to account for experimental observations. Structural deformation and the associated volume change provide another mechanism for the change in this thermodynamic property. We employed three equations of state models to characterize the excess energy present in the deformed regions and found that the excess volume provides a plausible explanation for the experimentally observed change in thermodynamic properties. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
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