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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents

ID: 211719.0, Fritz-Haber-Institut / Physical Chemistry
Electro-oxidation of carbon monoxide and methanol on bare and Pt-modified Ru(101¯0) electrodes
Authors:Pinheiro, Alexei L. N.; Zei, Mau-Scheng; Ertl, Gerhard
Date of Publication (YYYY-MM-DD):2005-02-07
Title of Journal:Phys. Chem. Chem. Phys.
Journal Abbrev.:PCCP
Issue / Number:6
Start Page:1300
End Page:1309
Copyright:© 2005 The Owner Societies
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The activity towards CO and methanol electrooxidation of bare and platinum-modified Ru(100) surfaces has been investigated. The structure/morphology and composition of the modified surfaces were characterized using electron diffraction techniques (LEED, RHEED) and Auger spectroscopy. The bare Ru(10-10) surface exhibits a higher catalytic activity towards CO electrooxidation than the Ru(0001) surface due to the lower oxidation potential of the former surface. The early stages of surface oxidation lead to disordering of the surface and further enhancing of the electrocatalytic activity. Electrodeposition of Pt on Ru(10-10) leads to epitaxial growth via a Volmer–Weber growth mode. The Pt clusters grow preferentially with the (311) plane parallel to the substrate surface with (01-1) rows in the layers in contact with the substrate compressed by about 3% with respect to bulk Pt, in order to match with the (-12-10) rows of the Ru(10-10) surface. This compression leads to enhanced catalytic activity towards CO oxidation for thin Pt deposits whereas for large deposited Pt particles the dominating factor for the catalytic enhancement is the higher concentration of surface defects. On the other hand, in the case of methanol oxidation, the dominant factor in determining the catalytic activity is the concentration of adjacent Pt–Ru sites, although surface defects play an important role in the methanol dehydrogenation steps.
Free Keywords:
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Zei MS, Department of Physics, National Central University, Jungli, Taiwan 32054
Identifiers:URL:http://www.rsc.org/Publishing/Journals/CP/article.... [only for subscriber]
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