Roth, Christina ; Papworth, A. J. ; Hussain, I. ; Nichols, R. J. ; Schiffrin, D. J. (2005)
A Pt-Ru nanoparticulate model system to study the bifunctional mechanism of electrocatalysis.
In: Journal of electroanalytical chemistry, 581 (1)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The reduced sensitivity of Pt–Ru alloys towards CO poisoning results from two effects: the ligand effect and the bifunctional mechanism. Although these have been known for many years, their applicability to nanoparticle electrocatalysts remains unclear. Furthermore, it is not known if the formation of a Pt–Ru alloy is necessary to improve the catalyst tolerance to CO or if the presence of Ru in immediate proximity to Pt nanoparticles (non-alloy systems) brings about a significant change. A new approach to the detailed investigation of the underlying mechanisms is presented by using mixtures of surfactant-stabilised Pt and Ru nanoparticles attached to an oxidised glassy carbon electrode. After CO activation the particle-decorated carbon surfaces become active for the methanol oxidation reaction as a result of the removal of part or all of the surfactant shell. However, despite this activation the onset potential and the peak maximum for both CO and methanol oxidation remain unchanged, independently of the mixture composition, whereas the maximum current decreases with increasing Ru content. Scanning transmission electron microscopy (STEM) investigations confirmed the close proximity between Pt and Ru nanoparticles on the electrode surface. However, no enhancement of activity was observed which may be due to the presence of small amounts of capping ligands preventing direct metal contact between the Ru and Pt nanoparticles.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2005 |
| Autor(en): | Roth, Christina ; Papworth, A. J. ; Hussain, I. ; Nichols, R. J. ; Schiffrin, D. J. |
| Art des Eintrags: | Bibliographie |
| Titel: | A Pt-Ru nanoparticulate model system to study the bifunctional mechanism of electrocatalysis |
| Sprache: | Englisch |
| Publikationsjahr: | 15 Juli 2005 |
| Verlag: | Elsevier Science Publishing Company |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of electroanalytical chemistry |
| Jahrgang/Volume einer Zeitschrift: | 581 |
| (Heft-)Nummer: | 1 |
| Kurzbeschreibung (Abstract): | The reduced sensitivity of Pt–Ru alloys towards CO poisoning results from two effects: the ligand effect and the bifunctional mechanism. Although these have been known for many years, their applicability to nanoparticle electrocatalysts remains unclear. Furthermore, it is not known if the formation of a Pt–Ru alloy is necessary to improve the catalyst tolerance to CO or if the presence of Ru in immediate proximity to Pt nanoparticles (non-alloy systems) brings about a significant change. A new approach to the detailed investigation of the underlying mechanisms is presented by using mixtures of surfactant-stabilised Pt and Ru nanoparticles attached to an oxidised glassy carbon electrode. After CO activation the particle-decorated carbon surfaces become active for the methanol oxidation reaction as a result of the removal of part or all of the surfactant shell. However, despite this activation the onset potential and the peak maximum for both CO and methanol oxidation remain unchanged, independently of the mixture composition, whereas the maximum current decreases with increasing Ru content. Scanning transmission electron microscopy (STEM) investigations confirmed the close proximity between Pt and Ru nanoparticles on the electrode surface. However, no enhancement of activity was observed which may be due to the presence of small amounts of capping ligands preventing direct metal contact between the Ru and Pt nanoparticles. |
| Freie Schlagworte: | Bifunctional mechanism; CO activation; Cyclic voltammetry; Methanol oxidation; Pt; Ru; Nanoparticles |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Erneuerbare Energien |
| Hinterlegungsdatum: | 20 Nov 2008 08:21 |
| Letzte Änderung: | 20 Feb 2020 13:24 |
| PPN: | |
| Sponsoren: | C. Roth gratefully acknowledges a Feodor–Lynen fellowship and addditional financial support from the European Union SUSANA Research and Training Network (Contract No. HPRN-CT-2002-00185)., I. Hussain has been supported by the National Institute for Biotechnology and Genetic Engineering (NIBGE) and the Ministry of Science and Technology, Pakistan. |
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