氢化燃烧合成与机械合金化复合制备LaMg_(11.5)Ni_(0.5)储氢材料

Hydrogen storage material of LaMg_(11.5)Ni_(0.5) prepared by hydriding combustion synthesis followed by mechanical milling

采用氢化燃烧合成和机械球磨复合制备了LaMg11.5Ni0.5三元储氢材料,物相分析可知,该体系由MgH2、Mg、Mg2NiH4,Mg2NiH0.3,LaH2以及少量LaNi5H0.3构成。氢化燃烧合成产物LaMg11.5Ni0.5经20h球磨后,在423K时,100s内达到饱和吸氢量3.42%(质量分数);在523K时,1800s内放氢基本完全,放氢量为3.29%(质量分数)。研究表明,该产物在523K时的放氢过程受界面移动过程控制。

In this paper, LaMg11.5 Ni0.5 ternary hydrogen storage materials were prepared by hydriding combustion synthesis combined with mechanical milling （HCS ＋ MM ）. The product consists of MgH2, Mg, Mg2NiH4, Mg2NiH0 .3, LaH2 and a little LaNi5 H0.3. 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 1 800s. Results show that the hydrogen desorption at 523K is controlled by phase boundary reaction mechanism.