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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Synthesis and hydrogen sorption properties of Mg_2FeH_6-MgH_2 nanocomposite prepared by reactive milling
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Synthesis and hydrogen sorption properties of Mg_2FeH_6-MgH_2 nanocomposite prepared by reactive milling

机译：反应研磨法制备Mg_2FeH_6-MgH_2纳米复合材料的合成及氢吸附性能

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摘要

The complex hydride Mg_2FeH_6 is an interesting material for hydrogen storage due to its high gravimetric hydrogen capacity as well as for having the highest known volumetric hydrogen density - 150kgm~(-3). Several papers have recently reported its synthesis from the stoichiometric precursors 2Mg-Fe or 2MgH_2-Fe through sintering process and ball milling under argon or hydrogen atmosphere. However, regardless of processing conditions, a remaining iron always was identified by X-rays diffraction, which resulted in a lower hydrogen storage capacity. In the present paper, the Mg_2FeH_6-MgH_2 nanocomposite was successfully synthesized through high-energy ball milling from 3Mg-Fe mixture under hydrogen atmosphere at room temperature. After the ball milling, X-rays diffraction patterns showed that the iron was kept to a minimum, which was also confirmed by simultaneous thermal analysis of differential scanning calorimetry and thermogravimetry. The gravimetric density of the ball milled 3Mg-Fe is more than 5 wt.% of hydrogen. In the case of 2Mg-Fe, processed in the same condition, the measured hydrogen capacity was 3.5 wt.%. The hydrogen sorption kinetics analyses were performed in a Sievert's apparatus in temperatures ranging from 250 °C to 350 °C Enhanced hydrogen sorption kinetics was observed for these 3Mg-Fe milled powders in comparison with the 2Mg-Fe ones.
机译：复合氢化物Mg_2FeH_6由于其高的重量氢容量以及已知的最高体积氢密度-150kgm〜（-3），是一种有趣的储氢材料。最近有几篇论文报道了通过化学计量的前体2Mg-Fe或2MgH_2-Fe通过烧结工艺和在氩气或氢气气氛下进行球磨合成的方法。然而，无论处理条件如何，总是通过X射线衍射来识别残留的铁，这导致较低的氢存储容量。本文通过在室温氢气氛下由3Mg-Fe混合物高能球磨成功地合成了Mg_2FeH_6-MgH_2纳米复合材料。球磨后，X射线衍射图显示铁含量保持在最低水平，差示扫描量热法和热重分析仪同时进行热分析也证实了这一点。球磨3Mg-Fe的重量密度大于氢气的5 wt。％。在相同条件下处理的2Mg-Fe情况下，测得的氢容量为3.5 wt。％。氢吸附动力学分析是在Sievert装置中于250°C至350°C的温度范围内进行的。与2Mg-Fe相比，这些3Mg-Fe研磨后的粉末观察到了增强的氢吸附动力学。

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