Effect of sintering conditions on the formation of single-phase NdMgNi₄ compound and its hydrogen storage properties

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• 作者：Z.M. Wang ; Huaiying Zhou ; R.P. Zou ; Qingrong Yao
• 关键词：REMgNi₄ ; Ball milling ; Sintering ; Discharge capacity ; Hydrogenation
• 刊名：Journal of Alloys and Compounds
• 出版年：2007
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：21 February 2007
• 卷：429
• 期：1-2
• 页码：260-263
• 文件大小：480 K

摘要

Effects of different sintering conditions on the formation of single-phase NdMgNi₄ compound and its electrochemical properties have been investigated. XRD analysis shows that an ideal single-phase compound of NdMgNi₄ can be synthesized by sintering the pressed tablets of mixture of Mg, Ni and NdNi powders under 973 K for 5 h; single-phase compounds of REMgNi₄ (RE = La, Ce, Pr) can be synthesized in this way as well. The electrochemical properties were measured by simulated battery tests. The maximum discharge capacity of NdMgNi₄ compound was about 200 mAh/g, and just 78 mAh/g for CeMgNi₄ compound. NdMgNi₄ compound could store 3.5 H/M of hydrogen under 2.5 MPa at 298 K, whilst it is difficult to absorb hydrogen at a higher temperature (473 K).