Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 17: Adsorption on Metal Surfaces

O 17.8: Talk

Monday, March 7, 2016, 16:45–17:00, H6

The interaction of deuterium with AgPd/Pd(111) surface alloys — •Thomas Diemant, Jan Martin, and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Albert-Einstein-Allee 47, Ulm University, D-89081 Ulm

AgPd/Pd(111) surface alloys, which consist of a reactive and an inert metal, represent an ideal test case for the study of ensemble effects on bimetallic surfaces. In the present contribution, we have studied their deuterium adsorption properties by temperature-programmed desorption (TPD) measurements. The structural properties (surface contents and atom distribution) were determined already earlier by high-resolution scanning tunnelling microscopy (STM) [1], which enables us to correlate the structural properties of these surface alloys to their adsorption behaviour. Most prominently, a steady decrease of the adsorbate coverage with increasing Ag content is observed. The results will be compared to findings on the interaction of CO with these surface alloys [2].

[1] R. Rötter, Diplomarbeit Ulm University (2009).

[2] Y. Ma et al., Surf. Sci. 603 (2009) 1046, Phys. Chem. Chem. Phys. 13 (2011) 10741.