Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1627337 | Journal of Alloys and Compounds | 2006 | 4 Pages |
Abstract
The hydriding/dehydriding properties of the La1.8Ca0.2Mg14Ni3 alloy modified by mechanical ball milling for 20Â h in different environment media, namely under argon, in toluene and in THF, respectively, have been investigated. XRD and SEM results show that the environment media affect the microstructure and surface morphology of the alloy noticeably. For the three environment media used, THF achieved the highest enhancement in hydriding/dehydriding properties. The effect of argon ranked the second and that of toluene the third. But the difference between the second and the third was very small. For the samples milled in THF, the amount of hydrogen absorbed reached 5.1Â wt.% within 300Â s at 600Â K and 4.2Â wt.% within 600Â s at room temperature. The amount of hydrogen desorbed reached 5.05Â wt.% at 613Â K. The remarkable improvement of the hydrogen storage properties of the ball-milled alloy in different environment media experimented is ascribed to the physical and chemical change of the alloy surface. Most probably are due to the appearance of the active sites and the electron donor-acceptor (EDA) complexes produced by the ball-milling process.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Linhui Gao, Changpin Chen, Lixin Chen, Qidong Wang, Changyao Wang, Yue An,