Characterization of hydrogen storage properties of Mg-30 wt.% Ti1.0V1.1Mn0.9 composite
Characterization of hydrogen storage properties of Mg-30 wt.% Ti1.0V1.1Mn0.9 composite
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DOI：
10.1016/j.jallcom.2006.01.005
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发表时间：
2006-11
影响因子：
6.2
通讯作者：
H. Gu;Yunfeng Zhu;Liquan Li
中科院分区：
文献类型：
--
作者：
H. Gu;Yunfeng Zhu;Liquan Li
Mg-30 wt.% Ti{sub 1.0}V{sub 1.1}Mn{sub 0.9} hydrogen storage composites were prepared by reactive ball milling (RBM) of a mixture of Mg and Ti{sub 1.0}V{sub 1.1}Mn{sub 0.9} alloy powders in hydrogen atmosphere. It was determined by X-ray diffraction (XRD) analysis that Mg partly transformed into MgH{sub 2} owing to the in situ activation under RBM process. The microstructures of the composites obtained by scanning electronic microscopy (SEM) analysis showed that Mg and Ti{sub 1.0}V{sub 1.1}Mn{sub 0.9} particles were greatly refined after ball milling and the smaller Ti{sub 1.0}V{sub 1.1}Mn{sub 0.9} particles were dispersed uniformly on the surface of Mg particles. Among the samples, the Mg-30 wt.% Ti{sub 1.0}V{sub 1.1}Mn{sub 0.9} composite milled for 20 h at a rotation speed of 200 rpm had the best hydrogen storage properties, both in hydrogen storage capacity and hydriding/dehydriding reaction rate. It absorbed 4.46 wt.% hydrogen at 606 K under the atmosphere of 3 MPa H{sub 2} within an hour for the first cycle. Even at 377 K, it still absorbed 1.77 wt.% hydrogen within an hour. No obvious degradation in hydrogen absorption/desorption property was observed for this sample after three hydriding/dehydriding cycles at 606 K. The improved hydriding/dehydriding properties of the composites were discussed with respect to the catalytic effect of Ti{sub 1.0}V{sub 1.1}Mn{sub 0.9} particles.
Mg-30 wt.% Ti{sub 1.0}V{sub 1.1}Mn{sub 0.9} hydrogen storage composites were prepared by reactive ball milling (RBM) of a mixture of Mg and Ti{sub 1.0}V{sub 1.1}Mn{sub 0.9} alloy powders in hydrogen atmosphere. It was determined by X-ray diffraction (XRD) analysis that Mg partly transformed into MgH{sub 2} owing to the in situ activation under RBM process. The microstructures of the composites obtained by scanning electronic microscopy (SEM) analysis showed that Mg and Ti{sub 1.0}V{sub 1.1}Mn{sub 0.9} particles were greatly refined after ball milling and the smaller Ti{sub 1.0}V{sub 1.1}Mn{sub 0.9} particles were dispersed uniformly on the surface of Mg particles. Among the samples, the Mg-30 wt.% Ti{sub 1.0}V{sub 1.1}Mn{sub 0.9} composite milled for 20 h at a rotation speed of 200 rpm had the best hydrogen storage properties, both in hydrogen storage capacity and hydriding/dehydriding reaction rate. It absorbed 4.46 wt.% hydrogen at 606 K under the atmosphere of 3 MPa H{sub 2} within an hour for the first cycle. Even at 377 K, it still absorbed 1.77 wt.% hydrogen within an hour. No obvious degradation in hydrogen absorption/desorption property was observed for this sample after three hydriding/dehydriding cycles at 606 K. The improved hydriding/dehydriding properties of the composites were discussed with respect to the catalytic effect of Ti{sub 1.0}V{sub 1.1}Mn{sub 0.9} particles.