Effect of Preparation Methods on Hydriding Properties of Composite Materials

摘要

La_(1.5)Mg_(17)Ni_(0.5) hydrogen storage materials were prepared by hydriding combustion synthesis (HCS) and mechanical alloying (MA) method respectively. The experimental results show that the hydrogen absorption properties of La_(1.5) Mg_(17)Ni_(0.5) prepared by MA are better than that by HCS. La_(1.5)Mg_(17)Ni_(0.5) prepared by MA can absorb 6.73 mass% hydrogen at 523 K within 1 min, and 4.92 mass% hydrogen at 423 K. The improvement of hydriding properties of La_(1.5)Mg_(17)Ni_(0.5) alloy prepared by MA can be ascribed to the formation of nano-crystalline and defects during the mechanical alloying.