Hydrogen storage material of LaMg_11.5Ni_0.5 prepared by hydriding combustion synthesis followed by mechanical milling

In this paper, LaMg_11.5Ni_0.5 ternary hydrogen storage materials were prepared by hydriding combustion synthesis combined with mechanical milling (HCS+MM). The product consists of MgH₂, Mg, Mg₂NiH₄, Mg₂NiH_0.3, LaH₂ and a little LaNi₅H_0.3. When the product of hydriding combustion synthesis is milled for 20h, it absorbs hydrogen with absorption capacity of 3.42% at 423K in 100 s, and desorption capacity of 3.29% at 523K in 1800s. Results show that the hydrogen desorption at 523K is controlled by phase boundary reaction mechanism.