Regensburg 2010 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 22: Hydrogen in Metals
MM 22.4: Vortrag
Dienstag, 23. März 2010, 11:00–11:15, H5
Li-Al-borohydride as a potential candidate for on-board hydrogen storage — •Inge Lindemann1, Roger Domènech Ferrer1, Lothar Dunsch1, Yaroslav Filinchuk2, Hans Hagemann3, Radovan Černý3, Ludwig Schultz1, and Oliver Gutfleisch1 — 1IFW Dresden, PO Box 270016, D-01171 Dresden, Germany — 2Swiss-Norwegian Beam Lines at ESRF, BP-220, 38043 Grenoble, France — 3University of Geneva, Crystallography and Physical Chemistry Department, 1211 Geneva, Switzerland
Recently, double-cation borohydride systems have attracted great interest. It was found that the desorption temperature of the borohydrides decreases with increasing electronegativity of the cation. Consequentely, it is possible to tailor a feasible on-board hydrogen storage material by combination of appropriate cations. Li-Al-borohydride shows a desorption temperature suitable for applications (≈ 70∘C) combined with an high hydrogen density (17.2 wt.%). It was synthesised via high energy ball milling of AlCl3 and LiBH4. The structure of the compound was obtained from high-resolution synchrotron powder diffraction and shows a unique complex structure within the borohydrides. The material was characterized by means of in-situ-Raman, DSC, TG and thermal desorption measurements to study its decomposition pathway. The desorption at ≈ 70∘C results in the formation of LiBH4 while the high mass loss of about 20% points to the release of not only hydrogen but also diborane. This is right now the main drawback for applications because it hinders reversibility.