Dehydrogenation behavior of LiAlH4-MgH2 composites was investigated by using thermal gravimetric analysis (TGA) and in situ synchrotron X-ray diffraction (XRD) technique. The experimental results showed that MgH2 could play a catalytic role in lowing the initial dehydrogenation temperature of LiAlH4. Besides, MgH2 could be destabilized by the dehydrogenation reaction products of LiAlH4. The initial dehydrogenation temperature of LiAlH4-MgH2 composites was as low as 145 C and MgH2 could decompose below 300 C. The compounds such as LiMgAlH6, Al3Mg2, Al 12Mg17 and Li0.92Mg4.08 formed during dehydrogenation process suggested some mutual reactions proceeded between LiAlH4 and MgH2.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry