Abstract
CO monolayer oxidation at Pt nanoparticles with different shape has been studied. A clear relationship between CO oxidation and surface structure/shape of the nanoparticles can be demonstrated. Whereas quasi-spherical small Pt nanoparticles show only a single, broad main oxidation peak, the employ of preferentially oriented Pt(100) nanoparticles originates peak multiplicity in the CO oxidation process. As a consequence of the increase of bidimensionally ordered domains, the appearance of a new sharp oxidation peak at 0.77-0.78 V is more and more evidenced. Thus, CO monolayer oxidation is revealed as a shape dependent reaction for the case of nanoparticles. The influence of the electrochemical surface disordering by oxidation-reduction cycles on the CO oxidation reaction on the different Pt nanoparticles was also studied. After the disordering process, the sharp CO oxidation peak at 0.77-0.78 V disappears, thus agreeing its initial assignment to the CO oxidation on bidimensionally ordered surface domains.
Original language | English |
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Title of host publication | Proceedings - Electrochemical Society |
Pages | 1-11 |
Number of pages | 11 |
Volume | PV 2005-11 |
Publication status | Published - 2005 |
Event | 207th Meeting of The Electrochemical Society Spring 2005 - Quebec City, QC, Canada Duration: 15 May 2005 → 20 May 2005 |
Conference
Conference | 207th Meeting of The Electrochemical Society Spring 2005 |
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Country/Territory | Canada |
City | Quebec City, QC |
Period | 15/05/05 → 20/05/05 |
Keywords
- CO monolayer oxidation
- Pt nanoparticles
- Shape and size effects in electrocatalysis
- Surface disorder
ASJC Scopus subject areas
- Engineering(all)