Regensburg 2016 – wissenschaftliches Programm
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AKE: Arbeitskreis Energie
AKE 7: System Analysis and Hydrogen Economy
AKE 7.3: Vortrag
Montag, 7. März 2016, 16:45–17:00, H3
Improved hydrogen storage properties of LiBH4 via nanoconfinement in nanoporous aerogel-like carbon — •Alexander Surrey1,2, Christian Bonatto Minella3, Nina Fechler4, Markus Antonietti4, Ludwig Schultz1,2, and Bernd Rellinghaus1 — 1IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, D-01171 Dresden, Germany — 2TU Dresden, Institut für Festkörperphysik, D-01062 Dresden, Germany — 3Karlsruhe Institute of Technology, Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany — 4Max Planck Institute of Colloids and Interfaces, Dept. of Colloid Chemistry Research, Campus Golm, D-14476 Potsdam, Germany
We present the effect of nanoconfinement of LiBH4 in nanoporous aerogel-like carbon on its hydrogen storage properties. The carbon scaffold is prepared by salt templating - a simple and sustainable technique for the production of nanoporous carbon-based materials. A loading of up to 40 wt. % of LiBH4 is achieved by melt infiltration, upon which the hydride remains amorphous. The nanoconfined LiBH4 starts to desorb hydrogen already at 200∘C with the main release at 310∘C, whereas the bulk material decomposes only above 400∘C. A partial rehydrogenation at moderate conditions (100 bar and 300∘C) is demonstrated. Under these conditions, bulk LiBH4 does not absorb any hydrogen. In contrast to a recent report, in-situ heating in the transmission electron microscope indicates that both decomposition products (B and LiH) remain within the carbon pores.