Berlin 2008 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 41: Poster SYM Hydrogen in Materials: New Developments

MM 41.4: Poster

Donnerstag, 28. Februar 2008, 18:00–20:00, Poster B

Hydrogen on planar and curved graphitic surfaces — •Helmut Hermann, Melanie Hentsche, Andrei Touzik, and Olga Khvostikova — Leibniz-Institute for Solid State and Materials Research IFW Dresden, PF 270116, D-01171 Dresden, Germany

For planar graphene, recent theoretical work has predicted a maximum amount of about 4.5wt% hydrogen storage capacity [1]. Thermodynamic estimates have shown that the storage capacities do not exceed 1wt% at 100K and rapidly decrease at higher temperatures [2]. Experimental investigations of the hydrogen storage capacity of nanostructured graphitic material in the temperature range of 30K to 300K point to the assumption that the storage capacity is considerably enhanced at low temperatures by the presence of small open micropores as compared to planar graphene [3]. Therefore, we are looking for graphitic materials with particularly high fraction of micropores. Expandable graphite seems to be a promising starting material for this purpose.

[1] T. Heine, L. Zhechov, G. Seifert, Phys. Chem. Chem. Phys. 6 (2004) 980.

[2] A. Touzik, H. Hermann, Chem. Phys. Lett. 416 (2005) 137.

[3] M. Hentsche, H. Hermann, D. Lindackers, G. Seifert, Int. J. Hydrogen En. 32 (2007) 1530.