Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 96: Structure of Solid/Liquid Interfaces II
O 96.6: Talk
Friday, March 11, 2016, 11:45–12:00, S052
Water adsorption on clean bimetallic Pt-Ru(0001) surfaces - a low-temperature UHV-STM investigation — •Martin Schilling, Sylvain Brimaud, and R. Jürgen Behm — Ulm University, Institute of Surface Chemistry and Catalysis, 89069 Ulm
A detailed understanding of the elementary electrochemical/-catalytic processes on catalytically relevant electrode surfaces requires the characterization of the solid | liquid interface, including the water-metal interaction and the influence of coadsorbed species. The water-metal interaction has been studied in detail earlier, using model systems consisting of ice layers adsorbed on monometallic single crystal surfaces [1].
Here, we present results of a scanning tunnelling microscopy (STM) study on the structure of H2O on 2D bimetallic PtRu model electrodes. H2O was deposited under well-defined conditions in ultrahigh vacuum (UHV) at low sample temperatures (100 - 130 K) on Pt modified Ru(0001) single crystal surfaces. In addition to adsorption on the clean metal surfaces, also structural effects of pre- or coadsorbed species on the overlayer structure were investigated. The structures were characterized by STM in the temperature range of 100 K to RT. Depending on the Pt-Ru surface structure, the conditions of H2O dosing and the presence of coadsorbates we identified different trends for the resulting molecular arrangements of the adsorbate. The influence of substrate-molecule and molecule-molecule interactions is discussed based on the Pt modified Ru(0001) substrate.
J. Carrasco et al., Nat. Mater. 11 (2012) 667