Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 60: Solid-liquid interfaces: Structure, Spectroscopy II
O 60.1: Talk
Wednesday, March 14, 2018, 10:30–10:45, MA 144
Adlayer formation of water and (co-)adsorbed CO on Ru(0001) and Ptn ML/Ru(0001) – A low temperature STM model study — •Martin Schilling, Sylvain Brimaud, and R. Jürgen Behm — Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm
Understanding the processes occurring at the electrode | electrolyte interface is of fundamental interest to understand the electrochemical/-catalytic processes on a catalyst surface in an aqueous environment. The adsorption of water on monometallic single crystal surfaces can be considered as model system for the solid | electrolyte interface, and accordingly this has been studied intensely, including STM studies [1,2]. Here it is important to note, that for water adsorption adsorbate–adsorbate interactions play a pronounced, if not dominant role for the structure formation process. Here we report results of a low temperature STM study, where we investigated the adlayer formation of (co-)adsorbed water and CO on Ptn ML/Ru(0001) [3,4] and Ru(0001) surfaces under UHV conditions. We discuss first the observed structures, and the role of adsorbate–metal and adsorbate–adsorbate interactions. Next, we propose a kinetic model describing the adlayer formation, and finally we discuss the role of competing of different adsorbed species (H2O, OH, CO, H) in the structure formation process. [1] J. Carrasco, A. Hodgson, A. Michaelides, Nat.Mater. 11 (2012) 667; [2] H.J. Yang, T. Minato, M. Kawai, Y. Kim, J.Phys.Chem.C. 117 (2013) 16429; [3] M. Schilling, S. Brimaud, R.J. Behm, PCCP. 19 (2017) 22434; [4] M. Schilling, S. Brimaud, R.J. Behm, Surf.Sci., in press (2017).