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Bifunctional Electrocatalysis in Pt−Ru Nanoparticle Systems

Roth, C. and Benker, N. and Theissmann, R. and Nichols, R. J. and Schiffrin, D. J. (2008):
Bifunctional Electrocatalysis in Pt−Ru Nanoparticle Systems.
In: Langmuir, ACS Publications, p. 2191, 24, (5), ISSN 0743-7463, [Online-Edition: http://dx.doi.org/10.1021/la7015929],
[Article]

Abstract

Pt-Ru alloys are prominent electrocatalysts in fuel cell anodes as they feature a very high activity for the oxidation of reformate and methanol. The improved CO tolerance of these alloys has been discussed in relation to the so-called ligand and bifunctional mechanisms. Although these effects have been known for many years, they are still not completely understood.Anew approach that bridges the gap between single crystals and practical catalysts is presented in this paper. Nanoparticulate model systems attached to an oxidized glassy carbon electrode were prepared by combining both ligand-stabilized and spontaneously deposited Pt and Ru nanoparticles. These electrodes showed very different voltammetric responses for CO and methanol oxidation. The cyclic voltammograms were deconvoluted into contributions attributed to Pt, Ru, and Pt-Ru contact regions to quantify the contribution of the latter to the bifunctional mechanism. Scanning transmission electron microscopy confirmed the proximity of Pt and Ru nanoparticles in the different samples.

Item Type: Article
Erschienen: 2008
Creators: Roth, C. and Benker, N. and Theissmann, R. and Nichols, R. J. and Schiffrin, D. J.
Title: Bifunctional Electrocatalysis in Pt−Ru Nanoparticle Systems
Language: English
Abstract:

Pt-Ru alloys are prominent electrocatalysts in fuel cell anodes as they feature a very high activity for the oxidation of reformate and methanol. The improved CO tolerance of these alloys has been discussed in relation to the so-called ligand and bifunctional mechanisms. Although these effects have been known for many years, they are still not completely understood.Anew approach that bridges the gap between single crystals and practical catalysts is presented in this paper. Nanoparticulate model systems attached to an oxidized glassy carbon electrode were prepared by combining both ligand-stabilized and spontaneously deposited Pt and Ru nanoparticles. These electrodes showed very different voltammetric responses for CO and methanol oxidation. The cyclic voltammograms were deconvoluted into contributions attributed to Pt, Ru, and Pt-Ru contact regions to quantify the contribution of the latter to the bifunctional mechanism. Scanning transmission electron microscopy confirmed the proximity of Pt and Ru nanoparticles in the different samples.

Journal or Publication Title: Langmuir
Volume: 24
Number: 5
Publisher: ACS Publications
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Erneuerbare Energien
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 20 Feb 2013 12:38
Official URL: http://dx.doi.org/10.1021/la7015929
Identification Number: doi:10.1021/la7015929
Funders: C.R. gratefully acknowledges a Feodor- Lynen fellowship., Also, support from the European Union under the FP6 program (NENA project, FP6, Contract NMP3-CT-2004-505906) is acknowledged.
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