Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 704, Issue -, Pages 44-50Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.02.045
Keywords
Hydrogen storage; Li-Mg-N-H; Amide; Borohydride; Reversibility; Thermal conductivity
Categories
Funding
- NSFC [51401059, 51361006, 51461010, 51361005, 51371060, U1501242, 51461011]
- Innovation Project of GUET Graduate Education [2016YJCX22]
- GXNSF [2014GXNSFAA118043, 2014GXNSFAA118333]
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The Li-Mg-N-H system has been widely considered as one of the most promising candidates for on-board hydrogen storage due to its high reversible hydrogen capacity, good reversibility, and favorable thermodynamics. In this study, we show that the hydrogen storage properties of the 2LiNH(2)/MgH2 sample can be further promoted through the addition of Mg(BH4)(2). The onset temperature for the dehydrogenation of the 2LiNH(2)/MgH2/0.1Mg(BH4)(2) sample is only 80 degrees C, showing a reduction of around 50 degrees C with respect to the 2LiNH(2)/MgH2 sample. The hydrogenation tests indicate that the dehydrogenated 2LiNH(2)/MgH2/0.1Mg(BH4)(2) sample could fully absorb about 5.0 wt% of hydrogen at 180 degrees C and 48 bar hydrogen pressure in 2 h, while only 3.5 wt% of hydrogen was recharged into the dehydrogenated 2LiNH(2)/MgH2 sample at 200 degrees C and 48 bar hydrogen pressure even within 30 h. The investigation on the structural changes and the cycling absorption/desortion of hydrogen was also performed. Moreover, the thermal conductivity of the as-milled 2LiNH(2)/MgH2 sample is almost doubled after the addition of 0.1Mg(BH4)(2) without any loss of hydrogen capacity. (C) 2017 Elsevier B.V. All rights reserved.
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