Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7717520 | International Journal of Hydrogen Energy | 2014 | 12 Pages |
Abstract
The static and dynamic pressure-concentration isotherms (PCIs) of MmNi5âxAlx (x = 0, 0.3, 0.5 and 0.8) hydrides were measured at different temperatures using volumetric method. The effect of Al substitution on PCI and thermodynamic properties were studied. The plateau pressure and maximum hydrogen storage capacity decreased with Al content whereas reaction enthalpy increased. The plateau pressure, plateau slope and hysteresis effect was observed more for dynamic PCIs compared to static PCIs. Different mathematical models used for metal hydride-based thermodynamic devices simulation are compared to select suitable model for static and dynamic PCI simulation of MmNi5-based hydrides. Few important physical coefficients (partial molar volume, reaction enthalpy, reaction entropy, etc.) useful for development of thermodynamic devices were estimated. A relation has been proposed to correlate aluminium content and physical coefficients for the prediction of unknown PCI. The simulated and experimental PCIs were found matching closely for both static and dynamic conditions.
Related Topics
Physical Sciences and Engineering
Chemistry
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Authors
Vinod Kumar Sharma, E. Anil Kumar, M. Prakash Maiya, S. Srinivasa Murthy,