Effect of LaNi5 and additional catalysts on hydrogen storage properties of Mg
Effect of LaNi5 and additional catalysts on hydrogen storage properties of Mg
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DOI：
10.1016/j.jallcom.2007.06.008
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发表时间：
2008-07-28
影响因子：
6.2
通讯作者：
Kulenovic, R.
中科院分区：
文献类型：
--
作者：
Fu, Y.;Groll, M.;Kulenovic, R.
为了提高镁的储氢性能，采用金属间化合物LaNi 5和催化剂Ti、V，通过球磨法制备了镁基纳米复合材料。所有样品均进行球磨，球磨时间长达40 h，并通过压力-浓度等温线（PCI）和反应动力学进行了测试。此外，X射线衍射（XRD）已被用于结构研究。根据PCI结果，在具有15和35重量%的样品中已经形成Mg 2Ni。LaNi 5通过长时间球磨。随着LaNi_5含量的增加，反应动力学的改善更为显著，但存储容量下降。添加Ti和V催化剂后，Mg的储氢性能得到了进一步的提高，Mg基复合材料在245 ℃下可以以合理的反应速率进行放氢。然而，即使在185摄氏度的低温下也会发生解吸，解吸速率极慢。(c)2007 Elsevier B. V.保留所有权利。
In order to improve hydrogen storage properties of Mg, the intermetallic compound LaNi5 and the catalysts Ti, V have been applied to synthesise Mg-based nanostructured composites by ball milling. All samples have been ball milled with milling times up to 40h and have been tested by means of pressure-concentration isotherms (PCIs) and reaction kinetics. In addition, X-ray diffraction (XRD) has been employed for structure investigation. According to the PCI results, Mg2Ni has been formed in the samples with 15 and 35 wt.% LaNi5 by prolonged ball milling. The improvement of reaction kinetics is more significant with more content of LaNi5, however, the storage capacities are degraded. The hydrogen storage properties of Mg have been further enhanced by additional catalysts of Ti and V. The Mg-based composites can desorb hydrogen at 245 degrees C with reasonable reaction rate. Desorption occurs even at a low temperature of 185 degrees C, however, with an extremely slow desorption rate. (c) 2007 Elsevier B.V. All rights reserved.