Effect of annealing treatment on hydrogen storage properties of La-Ti-Mg-Ni-based alloy

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• 作者：Weiqing JIANG^a ; ^{wqjiang@gxu.edu.cn} ; ^{guojin@gxu.edu.cn} ; Xiaohua MO^b ; Yinyan WEI^a ; Zhengcheng ZHOU^a ; Jin GUO^a ; ^c
• 关键词：La-Ti-Mg-Ni-based ; hydrogen storage property ; annealing ; electrochemical performance ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2012
• 期刊代码：7_10020721
• 类别：ms
• 出版时间：May, 2012
• 卷：30
• 期：5
• 页码：450-455
• 文件大小：936 K

摘要

The present study dealt with investigations on the effects of annealing on the hydrogen storage properties of La_1.6Ti_0.4MgNi₉ alloys. The experimental alloys were prepared by magnetic levitation melting followed by annealing treatment. For La_1.6Ti_0.4MgNi₉ alloys, LaNi₅, LaNi₃ and LaMg₂Ni₉ were the main phases, Ti₂Ni phase appeared at 900 掳C. Annealing not only enhanced the maximum and effective hydrogen storage capacity, improved the hydrogen absorption/desorption kinetics, but also increased the discharge capacity. The cyclic stability had been improved markedly by annealing, e.g., when the discharge capacity reduced to 60%of maximum discharge capacity, the charge/discharge cycles increased from 66 (as-cast) to 89 (annealed at 800 掳C) and 127 times (annealed at 900 掳C). La_1.6Ti_0.4MgNi₉ alloy annealed at 900 掳C exhibited better electrochemical properties compared to the other two alloy electrodes.