HYDROGEN STORAGE BY Mg-BASED NANOMATERIALS

In this work, we have studied experimentally the structure and electrochemical properties of nanocrystalline Mg2-xAlxNi- and nanocomposite Mg2-xAlxNi/Pd-type hydrogen storage materials (x=0, 0.5). These materials were prepared by mechanical alloying (MA) followed by annealing (450 degrees C/0.5 h). In the nanocrystalline Mg2Ni powder, discharge capacity up to 100 mA h g(-1) was measured. It was found that aluminium substituting magnesium in Mg2-xAlxNi alloy greatly improved the discharge capacity of studied material. In nanocrystalline Mg1.5Al0.5Ni powder, discharge capacities up to 175 mA h g(-1) were measured. On the other hand, mechanically coated Mg-based alloys with palladium have effectively reduced the degradation rate of the studied electrode materials.