Reduced Carbon Monoxide Saturation Coverage on Vicinal Palladium Surfaces: The Importance of the Adsorption Site
Journal article, 2021

Steps at metal surfaces may influence energetics and kinetics of catalytic reactions in unexpected ways. Here, we report a significant reduction of the CO saturation coverage in Pd vicinal surfaces, which in turn is relevant for the light-off of the CO oxidation reaction. The study is based on a systematic investigation of CO adsorption on vicinal Pd(111) surfaces making use of a curved Pd crystal. A combined X-ray Photoelectron Spectroscopy and DFT analysis allows us to demonstrate that an entire row of atomic sites under Pd steps remains free of CO upon saturation at 300 K, leading to a step-density-dependent reduction of CO coverage that correlates with the observed decrease of the light-off temperature during CO oxidation in vicinal Pd surfaces.


Fernando Garcia-Martinez

Centro de Física de Materiales (CSIC-UPV/EHU)

Elisabeth Dietze

Chalmers, Physics, Chemical Physics

F. Schiller

Centro de Física de Materiales (CSIC-UPV/EHU)

Dorotea Gajdek

Malmö university

L. R. Merte

Malmö university

Lund University

Sabrina M. Gericke

Lund University

Johan Zetterberg

Lund University

Stefano Albertin

Lund University

Edvin Lundgren

Lund University

Henrik Grönbeck

Chalmers, Physics, Chemical Physics

J. E. Ortega

University of the Basque Country (UPV/EHU)

Centro de Física de Materiales (CSIC-UPV/EHU)

Donostia International Physics Center

Journal of Physical Chemistry Letters

1948-7185 (eISSN)

Vol. 12 39 9508-9515

Subject Categories

Inorganic Chemistry

Physical Chemistry

Materials Chemistry

Areas of Advance

Materials Science





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