A new model for hydriding and dehydriding reactions in intermetallics

Abstract

A series of new formulae have been presented in this paper to describe the transformed fraction of hydriding/dehydriding reaction as a function of time t, temperature T, hydrogen partial pressure PH2 and particle radius R0. They are all explicit analytic function that will simplify the calculation and will be convenient for theoretical analysis and discussion. Besides, a new conception, "characteristic sorption time", has been introduced that will be useful for comparing the kinetic behavior of hydrogen storage materials. The application of this new model to La0.5Ni1.5Mg17 and LaNiMg17 intermetallics shows that this new model works very well and it is reasonable to expect that this new model will also be suitable for other hydrogen storage materials if the mechanism is similar. © 2006 Elsevier Ltd. All rights reserved.