By assuming the H diffusion coefficient and H adsorption rate to be exponentially and linearly dependent on concentration, a physical model was developed to predict the hydrogenation process of Mg nanoblades. The predicted H uptake curves agreed well with the experimental data from V-coated Mg nanoblades. The obtained H diffusion coefficients in MgHx between Mg and MgH2 have nearly three orders of magnitude variation. The characteristic time of H surface adsorption was longer than that of H diffusion in Mg but shorter than that in MgH2 for 100nm-thick nanoblades. A hydride shell was not formed during the hydrogenation.

Hydrogenation of Magnesium Nanoblades: the Effect of Concentration Dependent Hydrogen Diffusion. B.Yang, Y.P.He, Y.P.Zhao: Applied Physics Letters, 2011, 98[8], 081905