Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 39, Issue 11, Pages 5888-5898Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.01.174
Keywords
Metal hydride; Pressure-concentration isotherm; Hydrogen storage; Reaction enthalpy; Reaction entropy
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Pressure-concentration isotherms (PCIs) of LaNi5-xAlx (x = 0.3 and 0.4) hydrides were measured using a volumetric method. Two important thermodynamic properties, enthalpy of formation (Delta H) and entropy of formation (Delta S), were calculated using the van't Hoff equation. The effects of the Al content on the hydrogen storage capacity, plateau pressure and thermodynamic properties were studied. Additionally, the effects of the charging/discharging pressure difference (Delta P-s) during each step of the absorption/desorption PCI measurement on the hydrogen storage capacity (wt%), equilibrium pressure (P-e), plateau slope, reaction enthalpy (Delta H) and entropy (Delta S) were studied for LaNi4.6Al0.4 hydride. All of these properties (P-e, Delta H, Delta S, etc.) showed a significant variation with Delta P-s. The effect of the temperature range on the estimation of the enthalpy of formation was investigated. It was observed that Delta H depends on the experimental temperature range. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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