A model of H diffusion in spherical particles was developed. Results from some generic simulations were presented. It was in the model assumed that the processes for hydriding/dehydriding were initiated at the surface and progresses into the bulk of the particle governed by Fick's law of diffusion. The H flux into or out of the particle was initiated by introducing a phase boundary near the surface. The migrations of several different phase boundaries from the surface and into the center of the particle were simulated. Cyclic H flow into/out of the particle has also been studied. It was shown that the concentration limits at the phase boundary were a determining factor of the phase boundary migration rate.

A Model of Hydrogen Diffusion in Spherical Particles. T.O.Saetre: International Journal of Hydrogen Energy, 2006, 31[14], 2104-11