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Visualization of atomic processes on ruthenium dioxide using scanning tunneling microscopy

Over, H; Knapp, M; Lundgren, E; Seitsonen, A P; Schmid, M; Varga, P (2004). Visualization of atomic processes on ruthenium dioxide using scanning tunneling microscopy. ChemPhysChem, 5(2):167-174.

Abstract

The visualization of surface reactions on the atomic scale provides direct insight into the microscopic reaction steps taking place in a catalytic reaction at a (model) catalyst's surface. Employing the technique of scanning tunneling microscopy (STM), we investigated the CO oxidation reaction over the RuO2(110) and RuO2(100) surfaces. For both surfaces the protruding bridging O atoms are imaged in STM as bright features. The reaction mechanism is identical on both orientations of RuO2. CO molecules adsorb on the undercoordinated surface Ru atoms from where they recombine with undercoordinated O atoms to form CO2 at the oxide surface. In contrast to the RuO2(110) surface, the RuO2(100) surface stabilizes also a catalytically inactive c(2 x 2) phase may play an important role in the deactivation of RuO2 catalysts in the electrochemical Cl-2 evolution and other heterogeneous reactions.

Additional indexing

Item Type:Journal Article, refereed, further contribution
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > Atomic and Molecular Physics, and Optics
Physical Sciences > Physical and Theoretical Chemistry
Uncontrolled Keywords:Physical and Theoretical Chemistry, Atomic and Molecular Physics, and Optics
Language:English
Date:February 2004
Deposited On:27 Mar 2009 09:37
Last Modified:02 Jul 2025 03:36
Publisher:Wiley-Blackwell
ISSN:1439-4235
OA Status:Closed
Publisher DOI:https://doi.org/10.1002/cphc.200300833
PubMed ID:15038276

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