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MM: Fachverband Metall- und Materialphysik
MM 4: Materials for the Storage and Conversion of Energy
MM 4.7: Vortrag
Montag, 17. März 2025, 11:45–12:00, H22
The liquid intermediate phase for a hydrogen storage material — •Anastasiia Thase1, Oliver Alderman2, Chiara Milanese3,4, Alessandro Girella4, Claudio Pistidda5, Martin Müller5,6, and Sebastian Busch1 — 1GEMS MLZ, Helmholtz-Zentrum Hereon WPN — 2ISIS Neutron and Muon Source — 3C.S.G.I. Department of Chemistry, Physical Chemistry Division, University of Pavia — 4Pavia Hydrogen Lab — 5Helmholtz-Zentrum Hereon WTN — 6CAU zu Kiel, Leibnitzstr. 19, 24098 Kiel, Germany
Hydrogen storage in light hydrides for mobile applications is a widely discussed but a highly controversial topic because of its ability to form explosive mixtures with oxygen. However, this danger is eliminated, if hydrogen is stored in complex hydrides, which provide hydrogen only under significant heat impact.
The main issue for complex hydride mixtures is the kinetics of the reversible reaction with hydrogen. One of prospective candidates is 6Mg(NH2)2:9LiH, which promptly interacts with hydrogen when doped with LiBH4. Its catalytic impact is explained by the formation of low-melting intermediate phases with high Li-ion conductivity: a metastable Li2BH4NH2 and a peritectically melting Li4BH4(NH2)3.
In the LiNH2−LiBH4 phase diagram, the eutectic point is located at the 1:2 ratio and 90oC. This eutectic mixture was characterized by various techniques, including neutron total scattering, and its intrinsic structure under the reaction conditions was elucidated by EPSR, which gave a hint about its role as a liquid-phase catalyst in the corresponding hydrogen storage composition (6Mg(NH2)2:9LiH:6LiBH4).
Keywords: Hydrogen storage materials; Total Scattering; Intermediate phase; Eutectic point; EPSR