Hydrogen storage in magnesium based-composite hydride through hydriding combustion synthesis

✍ Scribed by Jin-Ho Kim; Ji-Ho Kim; Kwang-Taek Hwang; Yong-Mook Kang

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 742 KB
• Volume: 35
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.06.099

✦ Synopsis

Mg and Zr-based AB 2 hydride composite was prepared by hydriding combustion synthesis (HCS) and the hydridingedehydriding properties of HCS Mge(20, 40 wt%)AB 2 products were extensively examined. The dehydriding onset temperatures of the HCS Mge20AB 2 and Mge40AB 2 composites were 533 K and 493 K, respectively, which were lower than that of the MgH 2 . It is suggested that the well-dispersed Zr-based AB 2 phase in a Mg composite prepared by HCS plays a crucial role in significantly improving its kinetic properties.

Especially, the HCS Mge20AB 2 composite showed fully activated hydrogenation within the 8th cycle and reached a saturated H 2 absorption capacity of 5.7 wt.% at 573 K in 10 min. In addition, the hydrogen capacity did not show any significant decrease even after 86 cycles.

These results display a potential excellence of HCS processing in preparing Mg-based hydrogen storage materials.