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O: Fachverband Oberflächenphysik
O 20: Surface Chemical Reactions and Heterogeneous Catalysis II
O 20.12: Talk
Monday, March 11, 2013, 18:45–19:00, H33
Bonding of ammonia and its dehydrogenated fragments on Ru(0001) — •Sabine Maier1, Ingeborg Stass2, Jorge Cerda3, and Miquel Salmeron4 — 1University of Erlangen-Nürnberg, Department of Physics, Erlangen, Germany — 2Freie Universität Berlin, Institut für Experimental Physik, Berlin, Germany — 3CSIC, Instituto de Ciencia de Materiales, Madrid, Spain — 4Lawrence Berkeley National Laboratory, Materials Science, Berkeley, CA, United States
The catalytic ammonia decomposition has recently attracted attention due to the high hydrogen storage capacity of ammonia and the possibility to produce hydrogen without toxic or greenhouse gases as byproducts, making ammonia a potential candidate as an energy carrier for fuel cells. Here we present low temperature scanning tunneling microscopy experiments and density functional theory calculations that unambiguously establish the adsorption sites of the NHx (x=0-3) species and give insights into the dissociation pathways of ammonia on Ru(0001). All the N-H bond cleavage reactions were induced by controlled tip manipulation to produce each of the NHx (x=0-2) intermediates. Further, the interaction of ammonia with surface hydrogen and the ammonia dimer formation will be discussed.