Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1627345 | Journal of Alloys and Compounds | 2006 | 6 Pages |
Abstract
Mg-30Â wt.% Ti1.0V1.1Mn0.9 hydrogen storage composites were prepared by reactive ball milling (RBM) of a mixture of Mg and Ti1.0V1.1Mn0.9 alloy powders in hydrogen atmosphere. It was determined by X-ray diffraction (XRD) analysis that Mg partly transformed into MgH2 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 Ti1.0V1.1Mn0.9 particles were greatly refined after ball milling and the smaller Ti1.0V1.1Mn0.9 particles were dispersed uniformly on the surface of Mg particles. Among the samples, the Mg-30Â wt.% Ti1.0V1.1Mn0.9 composite milled for 20Â h at a rotation speed of 200Â rpm had the best hydrogen storage properties, both in hydrogen storage capacity and hydriding/dehydriding reaction rate. It absorbed 4.46Â wt.% hydrogen at 606Â K under the atmosphere of 3Â MPa H2 within an hour for the first cycle. Even at 377Â K, it still absorbed 1.77Â wt.% hydrogen within an hour. No obvious degradation in hydrogen absorption/desorption property was observed for this sample after three hydriding/dehydriding cycles at 606Â K. The improved hydriding/dehydriding properties of the composites were discussed with respect to the catalytic effect of Ti1.0V1.1Mn0.9 particles.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Hao Gu, Yunfeng Zhu, Liquan Li,