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Mg-Ti based materials for electrochemical hydrogen storage

机译：基于Mg-Ti的电化学储氢材料

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摘要

Results of the mechanical alloying of binary Mg-Ti and ternary Mg-Ti-Ni mixtures using two different process control agents are reported. Both high- and low-energy milling resulted in the formation of cubic compounds. When all starting reactants had disappeared, a mixture of two face-centered cubic (fcc) phases was formed with lattice constants around 4.40 and 4.25 A. The electrochemical hydrogen storage capacity, 450 mAh/g for (Mg_(0.65)Ti_(0.35))_(0.95)Ni_(0.05), was about one-third that reported for Mg-Ti thin films. This suggested that only one of the two fcc phases was active at ambient conditions. Prolonged mechanical alloying of (Mg_(0.60)Ti_(0.40))_(0.95)Ni_(0.05) resulted in full conversion of the material into one fcc-phase with a very small crystallite size, an intermediate lattice constant (4.33 A), and a sharply decreased storage capacity.
机译：报道了使用两种不同的过程控制剂对二元Mg-Ti和三元Mg-Ti-Ni混合物进行机械合金化的结果。高能和低能研磨均导致形成立方化合物。当所有起始反应物消失后，形成了两个面心立方（fcc）相的混合物，晶格常数约为4.40和4.25A。（Mg_（0.65）Ti_（0.35）的电化学储氢容量为450 mAh / g ）（0.95）Ni_（0.05），约为报道的Mg-Ti薄膜的三分之一。这表明两个fcc相中只有一个在环境条件下处于活动状态。 （Mg_（0.60）Ti_（0.40））_（0.95）Ni_（0.05）的长时间机械合金化导致材料完全转变为具有非常小的晶粒尺寸，中间晶格常数（4.33 A）的一个fcc相。并且存储容量急剧下降。

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