Investigation of the hydriding kinetic mechanism in the MgH2/Cr2O3-nanocomposite

Nanostructured Ti-catalyzed MgH2for hydrogen storage

“…This suggests that the rate limiting step is the threedimensional diffusion of hydrogen through the hydride. Diffusion as the rate limiting step in the whole hydrogen absorption process or part of the absorption process for Mg-based materials has been reported by many groups [39,40,[45][46][47]. According to equation ( 4), the absorption rate at 300 • C for the nano-MgH * 2 sample after desorption is 3.06 s −1 , which is 40 times faster than that of dehydrogenated commercial MgH 2 (0.0736 s −1 ).…”

Interfacial reaction and the dominant diffusing species in Mg–Ni system

“…The theoretical hydrogen storage capacities of Mg and Mg 2 Ni are 7.6 and 3.6 wt.%, respectively, among the highest of known metal-hydrides [1][2][3]. Mg-based alloys have the additional benefits of being abundant in nature, light in weight, inexpensive, and non-toxic [3][4][5]. Pure Mg oxidizes easily, and its ability for the sorption of hydrogen molecules degrades substantially when oxidized [5].…”

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

“…During the data processing, multiple regressions should be avoided in order to reduce the errors of the results. As to this aspect, Chou model had been successfully used in some study on hydrogen absorption/desorption kinetic mechanism of metal hydrides [14,19], and the results showed a good agreement with the experimental data. Hence, in Section 3.2, Chou model was first used to analyze the hydriding reaction mechanism of Ho 1Àx Mm x Co 2 alloys.…”