Effect of the structure of Pt–Ru/C particles on COad monolayer vibrational properties and electrooxidation kinetics
| Autor: | Béatrice Doisneau-Cottignies, Hervé Roussel, Frédéric Maillard, Antoine Bonnefont, Marian Chatenet, Ulrich Stimming, Laure Guétaz |
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| Přispěvatelé: | Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI ), Institut de Chimie du CNRS (INC)-Institut National Polytechnique de Grenoble (INPG)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Science et Ingénierie des Matériaux et Procédés (SIMaP), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des matériaux et du génie physique (LMGP ), Institut National Polytechnique de Grenoble (INPG)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Department of Physics E19 [Garching], Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM) |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Carbon-supported Pt–Ru particles
Chemistry General Chemical Engineering Particle agglomeration Analytical chemistry Infrared spectroscopy Nanoparticle chemistry.chemical_element HREM 02 engineering and technology [CHIM.MATE]Chemical Sciences/Material chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences 0104 chemical sciences FTIR spectroscopy Transition metal Monolayer Electrochemistry Particle Particle size PEMFC 0210 nano-technology Platinum |
| Zdroj: | Electrochimica Acta Electrochimica Acta, Elsevier, 2007, 53 (2), pp. 811-822. ⟨10.1016/j.electacta.2007.07.061⟩ |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2007.07.061⟩ |
| Popis: | International audience; In this paper, we combined FTIR spectroscopy and COad stripping voltammetry to investigate COad adsorption and electrooxidation on Pt–Ru/C nanoparticles. The Pt:Ru elemental composition and the metal loading were determined by ICP-AES. The X-ray diffraction patterns of the Pt–Ru/C indicated formation of a Pt–Ru (fcc) alloy. HREM images revealed an increase in the fraction of agglomerated Pt–Ru/C particles with increasing the metal loading and showed that agglomerated Pt–Ru/C nanoparticles present structural defects such as twins or grain boundaries. In addition, isolated Pt–Ru/C nanoparticles have similar mean particle size (ca. 2.5 nm) and particle size distributions whatever the metal loading. Therefore, we could determine precisely the effect of particle agglomeration on the COad vibrational properties and electrooxidation kinetics. FTIR measurements revealed a main COad stretching band at ca. ν(COL) = 2030 cm-1, which we ascribed to a-top COad on Pt domains electronically modified by the presence of Ru. As the metal loading increased, the position of this band was blue shifted by ca. 5 cm−1 and a shoulder around 2005 cm−1 developed, which was ascribed to a-top COad on Ru domains. The reason for this was suggested to be the increasing size of Ru domains on agglomerated Pt–Ru/C particles, which lifts dipole–dipole coupling and allows two vibrational features to be observed (COad/Ru, COad/Pt). This is evidence that FTIR spectroscopy can be used to probe small chemical fluctuations of the Pt–Ru/C surface. Finally, we comment on the COad electrooxidation kinetics. We observed that COad was converted more easily into CO2 as the metal loading, i.e. the fraction of agglomerated Pt–Ru/C nanoparticles, increased. |
| Databáze: | OpenAIRE |
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