Kinetics of hydrogen absorption in the solid solution region for Laves phase Ho1−xMmxCo2 (x = 0, 0.2 and 0.4) alloys

摘要: Abstract Hydrogen diffusion in the solid solution is significant for hydriding reaction kinetics of hydrogen storage materials. In this paper, Chou model was firstly used to investigate kinetic mechanism α phase (solid solution) region at temperature ranging from 773 1073 K and pressure range 65–190 mbar cubic Laves Ho 1− x Mm Co 2 (  = 0, 0.2 0.4, Mm = mischmetal) alloys. The results indicate that absorption controlled by into bulk. activation energies calculated using with least square method are 29.4–53.5 kJ/mol H , which close values reported original literature. Meanwhile, characteristic time can be characterize rate directly. way, influence temperature, initial concentration on analyzed discussed. It found accelerated increase concentration, diffusivity greatly depended concentration.