Enhanced Hydrogen Generation Properties of MgH2-Based Hydrides by Breaking the Magnesium Hydroxide Passivation Layer
Enhanced Hydrogen Generation Properties of MgH2-Based Hydrides by Breaking the Magnesium Hydroxide Passivation Layer
复制标题
通过破坏氢氧化镁钝化层增强 MgH2 基氢化物的产氢性能
作者：
Ouyang Liuzhang;Ma Miaolian;Huang Minghong;Duan Ruoming;Wang Hui;Sun Lixian;Zhu Min
氢化镁（MgH 2）由于其相对低的成本、高的氢气产率和环境友好的水解副产物而成为一种有吸引力的制氢候选物。然而，水解反应的MgH 2迅速抑制氢氧化镁钝化层的形成。为了提高MgH 2基复合材料的水解性能，我们研究了三种不同的方法：球磨、MgH 2基复合材料的合成和溶液组成的调节。研究表明，通过球磨和原位合成形成复合体系，如MgH 2 /LaH 3复合体系，可以改善MgH 2在纯水中的水解性能。在MgH 2 /LaH 3复合材料中加入Ni，可得到LaH 3 /MgH 2 /Ni复合材料。结果表明，在未形成氢氧化镁钝化层的情况下，LaH 3 /MgH 2 /Ni复合材料的水解速率（前5 min为120 mL/（g·min））高于MgH 2 /LaH 3复合材料（95 mL/（g·min））.此外，产率通过经由球磨的粒度的操纵来控制。通过优化水解液，提高了MgH 2的水解率. MgH 2在27.1%氯化铵溶液中于298 K下10 min内产氢量为1711.2mL/g，水解转化率达99.5%。
Due to its relatively low cost, high hydrogen yield, and environmentally friendly hydrolysis byproducts, magnesium hydride (MgH 2 ) appears to be an attractive candidate for hydrogen generation. However, the hydrolysis reaction of MgH 2 is rapidly inhibited by the formation of a magnesium hydroxide passivation layer. To improve the hydrolysis properties of MgH 2 -based hydrides we investigated three different approaches: ball milling, synthesis of MgH 2 -based composites, and tuning of the solution composition. We demonstrate that the formation of a composite system, such as the MgH 2 /LaH 3 composite, through ball milling and in situ synthesis, can improve the hydrolysis properties of MgH 2 in pure water. Furthermore, the addition of Ni to the MgH 2 /LaH 3 composite resulted in the synthesis of LaH 3 /MgH 2 /Ni composites. The LaH 3 /MgH 2 /Ni composites exhibited a higher hydrolysis rate—120 mL/(g·min) of H 2 in the first 5 min—than the MgH 2 /LaH 3 composite— 95 mL/(g·min)—without the formation of the magnesium hydroxide passivation layer. Moreover, the yield rate was controlled by manipulation of the particle size via ball milling. The hydrolysis of MgH 2 was also improved by optimizing the solution. The MgH 2 produced 1711.2 mL/g of H 2 in 10 min at 298 K in the 27.1% ammonium chloride solution, and the hydrolytic conversion rate reached the value of 99.5%.
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