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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 >Ball-milling and AlB_2 addition effects on the hydrogen sorption properties of the CaH_2 + MgB_2 system
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Ball-milling and AlB_2 addition effects on the hydrogen sorption properties of the CaH_2 + MgB_2 system

机译：球磨和AlB_2添加对CaH_2 + MgB_2系统氢吸附性能的影响

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摘要

Among the borohydrides proposed for solid state hydrogen storage, Ca(BH_4)2 is particularly interesting because of its favourable thermodynamics and relatively cheap price. Composite systems, where other species are present in addition to the borohydride, show some advantages in hydrogen sorption prop?erties with respect to the borohydrides alone, despite a reduction of the theoretical storage capacity. We have investigated the milling time influence on the sorption properties of the CaH_2 + MgB_2 system from which Ca(BH_4)_2 and MgH_2 can be synthesized by hydrogen absorption process. Manometric and calorimetric measurements showed better kinetics for long time milled samples. We found that the total substitution of MgB_2 with A1B_2 in the starting material can improve the sorption properties significantly, while the co-existence of both magnesium and aluminum borides in the starting mixture did not cause any improvement. Rietveld refinements of the X-ray powder diffraction spectra were used to confirm the hypothesized reactions.
机译：在提议用于固态氢存储的氢硼化物中，Ca（BH_4）2特别有趣，因为它具有良好的热力学和相对便宜的价格。尽管理论上的存储容量降低了，但除硼氢化物外还存在其他种类的复合体系相对于单独的硼氢化物，在氢吸附性能方面显示出一些优势。我们研究了研磨时间对CaH_2 + MgB_2系统吸附性能的影响，CaH_2 + MgB_2系统可以通过氢吸收过程合成Ca（BH_4）_2和MgH_2。测压和量热测量表明，长时间研磨的样品具有更好的动力学。我们发现，起始原料中的MgB_2被A1B_2完全取代可以显着改善吸附性能，而起始混合物中镁和硼化铝的共存则没有任何改善。 X射线粉末衍射光谱的Rietveld改进用于确认假设的反应。

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