Structural and hydriding/dehydriding properties of Mg–La–Ni-based composites
Structural and hydriding/dehydriding properties of Mg–La–Ni-based composites
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DOI：
10.1016/j.jallcom.2008.10.019
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发表时间：
2009-05
影响因子：
6.2
通讯作者：
Yunfeng Zhu;Yanfang Liu;H. Gu;Liquan Li
中科院分区：
文献类型：
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作者：
Yunfeng Zhu;Yanfang Liu;H. Gu;Liquan Li
以Mg、La_2 Mg_（17）和Ni粉末为原料，采用燃烧合成法（CS）和间歇燃烧合成法（HCS）分别合成了Mg-La-Ni三元复合储氢材料。然后，通过机械研磨（MM）处理每种复合材料的一部分。采用X射线衍射（XRD）和扫描电镜（SEM）对复合材料的晶体结构和表面形貌进行了表征。CS法制备的复合材料由Mg、La 2 Mg 17和Mg 2Ni相组成，HCS法制备的复合材料由Mg、MgH 2、LaH 3、Mg 2NiH 4和Mg 2NiH 0. 3相组成。与CS、CS+MM和HCS制备的复合材料相比，HCS+MM制备的复合材料具有最好的吸放氢性能。结果表明，HCS+MM工艺是制备镁基储氢材料的有效方法，该储氢材料在较低温度下具有较大的储氢容量和较快的储氢动力学。
In this study, two ternary hydrogen storage composites based on the Mg–La–Ni system were successfully synthesized from the mixture of Mg, La2Mg17and Ni powders at the weight ratio of 11:6:3 by combustion synthesis (CS) and hydriding combustion synthesis (HCS), respectively. Then, part of each composite was treated by mechanical milling (MM). The crystal structures and surface morphologies of the composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The composite prepared by CS consisted of Mg, La2Mg17and Mg2Ni phases, while the composite prepared by HCS was composed of Mg, MgH2, LaH3, Mg2NiH4and Mg2NiH0.3phases. Compared with the composites prepared by CS, CS+MM and HCS, the composite prepared by HCS+MM exhibited the best hydriding/dehydriding properties. We show that the process of HCS+MM is very effective in preparing Mg-based hydrogen storage materials, which have large hydrogen storage capacity and fast kinetics at lower temperature.