Synthesis and hydrogen storage thermodynamics and kinetics of Mg(AlH4)2 submicron rods |
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| Authors: | Yongfeng Liu Yuepeng PangXin Zhang Yifan ZhouMingxia Gao Hongge Pan |
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| Affiliation: | State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province & Department of Materials Science and Engineering, Zhejiang University, Zhejiang Province, Hangzhou 310027, People''s Republic of China |
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| Abstract: | Mg(AlH4)2 submicron rods with 96.1% purity have been successfully synthesized in a modified mechanochemical reaction process followed by Soxhlet extraction. ∼9.0 wt% of hydrogen is released from the as-prepared Mg(AlH4)2 at 125–440 °C through a stepwise reaction. Upon dehydriding, Mg(AlH4)2 decomposes first to generate MgH2 and Al. Subsequently, the newly produced MgH2 reacts with Al to form a Al0.9Mg0.1 solid solution. Finally, further reaction between the Al0.9Mg0.1 solid solution and the remaining MgH2 gives rise to the formation of Al3Mg2. The first step dehydrogenation is a diffusion-controlled reaction with an apparent activation energy of ∼123.0 kJ/mol. Therefore, increasing the mobility of the species involved in Mg(AlH4)2 will be very helpful for improving its dehydrogenation kinetics. |
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| Keywords: | Hydrogen storage Magnesium alanate Synthesis Morphology Thermodynamics and kinetics |
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