期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 450, 期 1-2, 页码 310-313出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2006.10.105
关键词
hydrogen storage materials; high-energy ball milling; X-ray diffraction; hydrogen absorption; hydrogen desorption
The catalytic effect of the addition of lanthanum oxide (La2O3), in the range 0.5-2.0 mol%, on the hydrogen storage properties of MgH2 prepared by ball milling has been studied. The addition of La2O3 reduces the formation during milling of the metastable orthorhombic gamma-MgH2 phase. The desorption rate of samples with 1 and 2 mol% La2O3 comes out to be about 0.010 wt% per second at 573 K under an hydrogen pressure of 0.3 bar, better than for sample with 0.5 mol% La2O3. The presence of LaH3 after hydrogenation/dehydrogenation cycles has been observed in all samples. The sample with 1 mol% of La2O3 gives a lower hysteresis factor compared with sample with 2 mol%. (C) 2006 Elsevier B.V. All rights reserved.
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