Formation of Mg2Ni with enhanced kinetics: Using MgH2 instead of Mg as a starting material

Formation of Mg2Ni with enhanced kinetics: Using MgH2 instead of Mg as a starting material
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具有增强动力学的 Mg2Ni 的形成:使用 MgH2 代替 Mg 作为起始材料

DOI:
10.1016/j.jssc.2012.04.011
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发表时间:
2012-08
影响因子:
3.3
通讯作者:
Zhu, Min
Zhu, Min
中科院分区:
化学3区
文献类型:
--
作者:
Zhao, Bin;Fang, Fang;Sun, Dalin;Zhang, Qingan;Wei, Shiqiang;Cao, Fenglei;Sun, Huai;Ouyang, Liuzhang;Zhu, Min

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当温度超过375℃时,与2 mg+Ni体系相比,2MgH2+Ni体系的生成速率大大提高。对这两个体系的X射线吸收精细结构的原位观察表明,在2MgH_2+Ni体系中形成Mg--Ni键的速度比在2Mg+Ni体系中更快。此外,理论模拟还表明,与正常的镁原子相比,镁原子以更少的能量很容易从镁氢中释放出来,从而更容易在镁氢脱氢发生时与镍反应。
At a temperature over the decomposition point (375°C) of MgH2, the formation of Mg2Ni is greatly enhanced from the 2MgH2+Ni system, as compared to the 2Mg+Ni system. In support of this finding, in-situ observation of X-ray absorption fine structure of the two systems indicates that MgNi bonds form faster in the 2MgH2+Ni system than in the 2Mg+Ni system. Furthermore, theoretical modeling also shows that Mg atoms are readily released from MgH2using much less energy and thus are more available to react with Ni once the dehydrogenation of MgH2occurs, as compared to normal Mg.
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