Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Metal Substrates II
O 82.12: Vortrag
Donnerstag, 3. April 2014, 18:45–19:00, WIL A317
Pt-coverage dependence and adsorption kinetics of the coadsorption of CO and deuterium on bimetallic Pt/Ru(0001) surfaces — Heinrich Hartmann, •Joachim Bansmann, Thomas Diemant, and R. Jürgen Behm — Institut for Surface Chemistry and Catalysis, Ulm University, D-89081 Ulm
The interaction of hydrogen and CO with bimetallic PtRu surfaces as technological promising materials is of high interest for the understanding of the chemistry in low temperature Polymer Electrolyte (PE) fuel cells. In the present TPD and IR study we investigated the coadsorption of CO and deuterium at 100 K (subsequently exposed) on sub-monolayer Pt films on Ru(0001) as model systems.
The total coverage of adsorbates (COad and Dad) on the bimetallic Pt/Ru(0001) surface depends not only on the amount of Pt on the surface, but also strongly on the sequence in the coadsorption process. Deuterium adsorption followed by high CO exposures results in very high coverages, whereas, in the opposite case, no further D2 adsorption is possible on a saturated CO layer and the total coverages are smaller. Here, we will additionally analyze the influence of pre-adsorbed Dad species on the CO adsorption kinetics and the total adsorbate coverage compared to pure CO and deuterium adsorption on bimetallic Pt/Ru(0001) [1] and PtRu/Ru(0001) surfaces alloys [2].
H. Hartmann et al., Phys. Chem. Chem. Phys. 14 (2012) 10919.
T. Diemant et al., Chem. Phys. Chem. 11 (2010) 1482.