Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 10: Metal/Water Interfaces: Structure and Reactivity
O 10.9: Vortrag
Montag, 16. März 2015, 17:00–17:15, HE 101
H2O adsorption on bimetallic Pt-Ru(0001) surfaces - a low-temperature UHV-STM investigation — •Martin Schilling, Albert K. Engstfeld, Sylvain Brimaud, and R. Jürgen Behm — Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany
Profound knowledge of the elementary electrochemical/-catalytic processes on catalytically relevant electrode materials requires a detailed understanding of the solid | liquid interface, including the water | metal interaction. The latter has been investigated in detail in earlier studies, using model systems consisting of ice layers adsorbed on monometallic single crystal surfaces.[1,2]
Where in former studies only H2O adsorption on monometallic surfaces were subject of investigation, we present results on the interaction of H2O with 2D bimetallic PtRu model electrodes. H2O was deposited under well defined conditions in ultra high vacuum (UHV) at low sample temperatures (100 K - 130 K) on Pt modified Ru(0001) single crystal surfaces. The structures have been investigated with scanning tunnelling microscopy (STM) in a temperature range of 100 K to RT.
Depending on the Pt layer thickness on Ru(0001) and the dosing conditions of H2O, a variety of molecular arrangements are observed, which vary from total disorder to well-ordered domains. The influence of substrate | molecule and molecule | molecule interactions are discussed based on the Pt modified Ru(0001) substrate.
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