Structures and Hydrogen Storage Properties of La_1-xMg_xNi_4.25Al_0.75 (x=0.0, 0.1, 0.2, 0.3) Alloys

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• 作者：Lü ; Lijun^a ; ^c ; Cheng Honghui^a ; ^b ; ^{31834385@qq.com" class="auth_mail" title="E-mail the corresponding author} ; Han Xingbo^a ; Lei Guanhong^a ; Tang Xiaoxing^a ; Wang Chengbin^a ; Liu Wei^a ; Li Xiaolin^a
• 关键词：RE hydrogen storage alloy ; Mg substitution ; hydrogen storage property
• 刊名：Rare Metal Materials and Engineering
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：45
• 期：1
• 页码：56-61
• 全文大小：1148 K

文摘

La_1-xMg_xNi_4.25Al_0.75 (x=0.0, 0.1, 0.2, 0.3) hydrogen storage alloys were prepared by a three-step induction melting. Their crystal structures and hydrogen storage properties were investigated. Results show that alloys with x=0.0 and 0.1 contain a single LaNi₄Al phase; however, those with x=0.2 and 0.3 are composed of LaNi₄Al, (La, Mg)Ni₃ and AlNi₃ phases. With x increasing from 0.2 to 0.3, the abundances of the secondary phases and the plateau pressures in the pressure-composition isotherms are lifted significantly. Meanwhile, their hydrogen storage capacities are remarkably reduced. It is found that the alloy with x=0.1 possesses the fastest absorption kinetics compared to the others as well as a good hydrogen capacity and a low plateau pressure.