Preparation and Hydrogen storage properties of Mg-rich Mg-Ni ultrafine particles
Preparation and Hydrogen storage properties of Mg-rich Mg-Ni ultrafine particles
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DOI：
10.1155/2012/592147
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发表时间：
2012
影响因子：
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通讯作者：
J. Zou;Hai-quan Sun;X. Zeng;G. Ji;W. Ding
中科院分区：
文献类型：
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作者：
J. Zou;Hai-quan Sun;X. Zeng;G. Ji;W. Ding
采用电弧等离子体法制备了富镁镍超细粉体。研究了粉末的相组成、微观结构和储氢性能。结果表明，Mg和Ni之间的气相反应可以直接生成Mg 2Ni和MgNi 2，这取决于反应室中的局部蒸气含量。Mg-Ni超细粉经加氢处理后可得到纳米结构的MgH 2 + Mg 2NiH 4储氢复合材料。脱氢后，MgH 2和Mg 2NiH 4分别分解为纳米晶Mg和Mg 2Ni。热重/差示扫描量热（TG/DSC）分析表明，Mg 2NiH 4相在氢化Mg超微粒的放氢过程中起催化作用。
In the present work, Mg-rich Mg-Ni ultrafine powders were prepared through an arc plasma method. The phase components, microstructure, and hydrogen storage properties of the powders were carefully investigated. It is found that Mg2Ni and MgNi2 could be obtained directly from the vapor state reactions between Mg and Ni, depending on the local vapor content in the reaction chamber. A nanostructured MgH2+Mg2NiH4 hydrogen storage composite could be generated after hydrogenation of the Mg-Ni ultrafine powders. After dehydrogenation, MgH2 and Mg2NiH4 decomposed into nanograined Mg and Mg2Ni, respectively. Thermogravimetry/differential scanning calorimetry (TG/DSC) analyses showed that Mg2NiH4 phase may play a catalytic role in the dehydriding process of the hydrogenated Mg ultrafine particles.