Abstract: Mg-25 wt% Mg₂Ni composite was prepared by sintered method, hydrided at 613 K and then ball-milled with 1.5 wt% PdCl₂ additive for 51 h. The effects of PdCl₂ on the hydriding and dehydriding behavior of Mg-25 wt% Mg₂Ni composite were investigated. The absorption and desorption rate of the composite with PdCl₂ is fast and the hydrogen storage capacity is more than that of the composite without PdCl₂. The maximum hydrogen storage capacity reached 3.48 wt% at 373 K, and 5.05 wt% H at 453 K, respectively. The improvement of sorption and desorption kinetics is attributed to the catalytic effect of PdCl₂, and the grain refining and lattice strain introduced by ball milling.

Key words: Hydrogen storage, Mg-based composite, PdCl₂ additive, Ball milling

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