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Dehydriding properties of γ-AlH3.
- Source :
-
International Journal of Hydrogen Energy . Aug2013, Vol. 38 Issue 25, p10851-10856. 6p. - Publication Year :
- 2013
-
Abstract
- AlH3 is a promising hydrogen storage material due to its high hydrogen capacity (10 wt%) and relatively low dehydriding temperature. In this work, γ-AlH3 was prepared by organometallic synthesis method and the effects of ball milling on dehydriding properties of γ-AlH3 were investigated systematically. Experimental results shows that as-prepared γ-AlH3 releases about 8.3 wt% of hydrogen in the temperature range of 130–160 °C at a heating rate of 2 °C/min. Ball milling significantly improves the dehydriding behavior of γ-AlH3. DSC-MS analysis reveals that the dehydriding temperature of γ-AlH3 ball-milled for 10 h decreases by around 30 °C. In addition, the dehydriding activation energy of γ-AlH3 ball-milled for 2 h decreased from 87 to 68 kJ/mol. Isothermal dehydriding measurements demonstrate that duration needed to release 90% hydrogen for as-prepared γ-AlH3 is 280 min, but it takes only 82 min after ball milled for 10 h to release the same amount of hydrogen. Moreover, the dehydriding path of γ-AlH3 is changed by ball milling. As-prepared γ-AlH3 transforms to α-AlH3 before dehydriding, while ball-milled γ-AlH3 prefers to dehydride directly without firstly transforming to α-AlH3. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03603199
- Volume :
- 38
- Issue :
- 25
- Database :
- Academic Search Index
- Journal :
- International Journal of Hydrogen Energy
- Publication Type :
- Academic Journal
- Accession number :
- 89488624
- Full Text :
- https://doi.org/10.1016/j.ijhydene.2013.02.095