Comparison of commercial and hydriding-combustion-synthesized Mg-hydride

摘要

This study employed a fast, simple and cost-effective hydriding combustion synthesis (HCS) to prepare nano/ submicron Mg based alloys, which are the most promising solid state hydrogen storage materials owing to their high storage capacity (7.6 wt.%) and highest volumetric density. The microstructural and absorption/ desorption kinetic properties of the prepared MgH_2 samples were characterized and compared with commercially available MgH_2 powders. The detailed BET analysis of the HCS prepared samples showed a higher surface area than that of commercial MgH2, which resulted in better absorption/desorption kinetics. The HCS-prepared MgH_2 powder absorbed 6.2 wt% H_2 with a rate of 0.31 wt.%/min, whereas it desorbed at a rate of 0.98 wt.%/min. These results highlight the superiority of the HCS method to prepare MgH_2 powders over conventional ingot-metallurgy.