Hydrogen storage properties of MgH2-(Sr,Ca)2AlH7 composite
Hydrogen storage properties of MgH2-(Sr,Ca)2AlH7 composite
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DOI：
10.1016/j.jallcom.2009.05.114
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发表时间：
2009-10
影响因子：
6.2
通讯作者：
D. Liu;C. Fang;Q. Zhang
中科院分区：
文献类型：
--
作者：
D. Liu;C. Fang;Q. Zhang
本文研究了一种新设计的掺杂少量TiF3的MgH2-(Sr,Ca)2AlH7复合材料的储氢性能、相组成和表面特性。结果发现，掺杂2mol% TiF3 的MgH2–30wt.% (Sr,Ca)2AlH7 复合材料在573K 时能快速解吸氢。而且在473K以下的温度、1.0MPa的氢气压力下具有较高的再氢化率。新的含Ti物质以及吸氢前脱氢过程中形成的(Sr,Ca)F2、(Sr,Ca)H2和(Sr,Ca)Al4相均匀分布在Mg颗粒表面，对Mg相的再氢化过程具有良好的催化作用。
The hydrogen storage properties, phase components and surface characteristics of a newly designed MgH2–(Sr,Ca)2AlH7composite doped with a little amount of TiF3were studied in this paper. It was found that the MgH2–30wt.% (Sr,Ca)2AlH7composite doped with 2mol% of TiF3desorbed hydrogen quickly at 573K. Moreover, it has a higher re-hydrogenation rate at the temperatures below 473K under the hydrogen pressure of 1.0MPa. The new Ti-contained species as well as the phases (Sr,Ca)F2, (Sr,Ca)H2and (Sr,Ca)Al4formed during the dehydrogenation process prior to the hydrogen uptake distributes homogeneously on the surface of Mg particles, and has a good catalytic effect on the re-hydrogenation process of Mg phase consequently.