Effect of measurement parameters on thermodynamic properties of La-based metal hydrides

Experimental and theoretical studies on static and dynamic pressure–concentration isotherms of MmNi 5−x Al x ( x = 0, 0.3, 0.5 and 0.8) hydrides

“…The physical coefficients (DH, DS, k, f s , A, g, V H and DH s ) are the coefficients of Zhou's model (Eqs. (1) and (4)) which are required for PCI simulation. The physical coefficients of a and b phases are depend on solubility of hydrogen atom in alloy whereas physical coefficients of plateau phase are depend on phase transition.…”

“…The method of calculating uncertainty is in our previous article [1]. The maximum cumulative uncertainty in total wt% was calculated at ±3.5 and ±3% for dynamic and static measurements respectively.…”

“…[5]. The variation in those operating parameters significantly affects the PCI, thermodynamic and kinetics properties of metal hydride employed [1,5]. In that case many experiments have to be conducted to determine the PCIs at different temperatures or a mathematical model can be used to solve this problem [6].…”

Studies on La based intermetallic hydrides to determine their suitability in metal hydride based cooling systems

“…Partial substitution with Al improves the cycling performance and significantly reduces the plateau pressure. The decrease in plateau pressure is due to an increase in the unit cell volume [1]. Additionally, the kinetic properties of Al substituted LaNi 5 hydrides were studied by several investigators [7e9] and reported that the reaction rates of LaeNieAl intermetallics are faster than that of LaNi 5 hydride.…”

“…Recently, Vinod and Anil [1] have studied the effect of different measurement parameters on PCI and thermodynamic properties of Al substituted LaNi 5 based metal hydrides. It was reported that for the development of any metal hydride based thermodynamic devices, the PCI and thermodynamic properties of metal hydrides employed should be measured at appropriate operating conditions like charging/discharging pressure difference, temperature range, etc.…”