Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7722250 | International Journal of Hydrogen Energy | 2013 | 9 Pages |
Abstract
The effect of lithium borohydride (LiBH4) on the hydriding/dehydriding kinetics and thermodynamics of magnesium hydride (MgH2) was investigated. It was found that LiBH4 played both positive and negative effects on the hydrogen sorption of MgH2. With 10 mol.% LiBH4 content, MgH2-10 mol.% LiBH4 had superior hydrogen absorption/desorption properties, which could absorb 6.8 wt.% H within 1300 s at 200 °C under 3 MPa H2 and completed desorption within 740 s at 350 °C. However, with the increasing amount of LiBH4, the hydrogenation/dehydrogenation kinetics deteriorated, and the starting desorption temperature increased and the hysteresis of the pressure-composition isotherm (PCI) became larger. Our results showed that the positive effect of LiBH4 was mainly attributed to the more uniform powder mixture with smaller particle size, while the negative effect of LiBH4 might be caused by the H-H exchange between LiBH4 and MgH2.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Yanbiao Pan, Haiyan Leng, Jia Wei, Qian Li,