ON THE HYDRIDING OF A MECHANICALLY ALLOYED MG(90-PERCENT)-V2O5(10-PERCENT) MIXTURE

The hydriding of a mixture of 90 wt% Mg and 10 wt% V2O5 obtained by mechanical alloying in an inert medium has been investigated. It is established that during the initial stage of the process the hydriding rate is limited by the dissociative adsorption of hydrogen on the mixture particles, whereas with the advancing process the rate is successively controlled by surface chemical reactions (during the MgH2 nuclei are formed and grown) and diffusion. It is shown that the mixture has a high hydrogen capacity which does not decrease during the prolonged hydriding-dehydriding cycles. Due to these properties and the good desorption characteristics, the mechanically alloyed mixture of 90 wt% Mg and 10 wt% V2O5 is a suitable material for hydrogen storage. © 1990.