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Updated: Jun 17, 2026

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
Published on: March 29, 2016
Coadsorption of hydrogen and CO on hydrogen pre-covered PtRu/Ru(0001) surface alloys
Thomas Diemant1, Joachim Bansmann, Hubert Rauscher
1Institute of Surface Chemistry and Catalysis, Ulm University, 89069 Ulm, Germany. thomas.diemant@uni-ulm.de
Abstract:
The influence of pre-adsorbed hydrogen on the adsorption of CO on well-defined PtRu/Ru(0001) surface alloys and the modification of the adsorption properties of both adsorbate species due to coadsorption was studied by a combination of temperature-programmed desorption and infrared spectroscopic measurements. The hydrogen binding strength is weakened both by surface alloy formation and by CO coadsorption. In the densely packed coadsorbate layers, which can be formed after CO post-adsorption, the adsorption properties of the adsorbed CO molecules are also affected significantly. Depending on the Pt surface concentration, the CO adsorption process on hydrogen pre-covered surfaces is blocked to a different extent with a decreasing blocking tendency for Pt-rich alloys.
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