In-situ QENS investigation of Complex Hydrides
Hydrides are in the focus of research for the application of energy storage and energy transportation. Complex hydrides has recently gained in importance because of good properties for reversible hydrogen storage. The composition Mg(NH2)2 + LiH has faster de- and rehydrogenation kintetics with the addition of LiBH4. So far Mg(NH2)2 + LiH + LiBH4 is a good candidate to be used for hydrogen storage with the high capacity (ca. 4 wt%) and good reversibility. To understand the effect of the LiBH4 additive on the kinetics, QENS experiments were applied at Heinz Maier-Leibnitz Zentrum (MLZ). At the TOFTOF instrument the Time-of-Flight spectroscopy of Li4BH4(NH2)3 was investigated, which is an intermediate of the dehydrogenated Mg(NH2)2 + LiH + LiBH4-system. This product showed in the QENS measurement high degree of freedom for rotational and transversal motions below the melting temperature. The high mobility of the BH4-tetrahedron can explain the fast absorption kinetics of Mg(NH2)2 + LiH + LiBH4. To reinforce this consideration we want to measure in-situ QENS of Mg(NH2)2 + LiH + LiBH4 in comparison to Mg(NH2)2 + LiH at the IN5 instrument.
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ASLAN Neslihan; Sebastian Busch; KUZNETSOVA Anastasiia; Wiebke Lohstroh and ZANOTTI Jean-Marc. (2021). In-situ QENS investigation of Complex Hydrides. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-05-515
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