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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 >Hydrogen desorption properties of MgH_2-Ni-Ni_2Si composites prepared by mechanochemical method
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Hydrogen desorption properties of MgH_2-Ni-Ni_2Si composites prepared by mechanochemical method

机译：机械化学法制备的MgH_2-Ni-Ni_2Si复合材料的氢解吸性能

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摘要

To improve hydrogen desorbability of Mg, some composites were prepared from MgH_2, Ni and Ni_2Si mixed powders by the mechanochemical method. The MgH_2-Ni(2 mol%)-Ni_2Si(l mol%) composite was slower in hydrogen desorption rate at 250 °C than the MgH_2-Ni(2 mol%) composite, while the hydrogen desorption rate at 220 °C for the former was faster than that for the latter. The XRD pattern of the MgH_2-Ni(2 mol%) composite showed that after hydrogen desorption at 400 °C small diffraction peaks assigned to Mg_2Ni were observed with peaks assigned to Mg. They shifted to smaller angles after hydrogen absorption at 250 °C and come back to the original positions after hydrogen desorption at 250 °C, suggesting reversible hydrogen absorption/desorption of Mg_2Ni. In contrast, Ni_2Si was not changed over the whole processes. These results indicated that Ni_2Si worked as a catalyst for hydrogen desorption, leading to the improvement of desorbability at 220 °C.
机译：为了提高镁的氢脱附能力，采用机械化学方法由MgH_2，Ni和Ni_2Si混合粉末制备了一些复合材料。 MgH_2-Ni（2 mol％）-Ni_2Si（1 mol％）复合材料在250°C时的氢气脱附速率比MgH_2-Ni（2 mol％）复合材料慢，而在220°C时氢气的脱附速率前者比后者快。 MgH_2-Ni（2 mol％）复合材料的X射线衍射图谱表明，在400°C的氢气脱附后，观察到分配给Mg_2Ni的小衍射峰，而分配给Mg的峰。它们在250°C吸收氢后移至较小的角度，并在250°C吸收氢后返回原始位置，表明Mg_2Ni可逆吸收/解吸。相反，Ni_2Si在整个过程中没有变化。这些结果表明Ni_2Si用作氢解吸的催化剂，导致在220℃下的解吸性提高。

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