Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7719768 | International Journal of Hydrogen Energy | 2014 | 11 Pages |
Abstract
Pressure-concentration isotherms (PCIs) of LaNi5âxAlx (x = 0.3 and 0.4) hydrides were measured using a volumetric method. Two important thermodynamic properties, enthalpy of formation (ÎH) and entropy of formation (ÎS), 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 (ÎPs) during each step of the absorption/desorption PCI measurement on the hydrogen storage capacity (wt%), equilibrium pressure (Pe), plateau slope, reaction enthalpy (ÎH) and entropy (ÎS) were studied for LaNi4.6Al0.4 hydride. All of these properties (Pe, ÎH, ÎS, etc.) showed a significant variation with ÎPs. The effect of the temperature range on the estimation of the enthalpy of formation was investigated. It was observed that ÎH depends on the experimental temperature range.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Vinod Kumar Sharma, E. Anil Kumar,