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On the suitability of hydrous ruthenium oxide supports to enhance intrinisic proton conductivity in direct methanol anodes

Scheiba, Frieder and Scholz, Manuel and Cao, Lin and Roth, Christina and Cremers, C. and Qiu, X. and Stimming, U. and Fuess, Hartmut (2006):
On the suitability of hydrous ruthenium oxide supports to enhance intrinisic proton conductivity in direct methanol anodes.
In: Fuel cells, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, pp. 439-446, 6, [Article]

Abstract

Hydrous ruthenium oxides have been investigated as novel support materials for fuel cell electrocatalysts for use in DMFC applications. These oxides were chosen in particular due to their potential intrinsic proton conductivity. Pt nanoparticles have been deposited onto the new support, and the resulting catalysts characterized both structurally and electrochemically. The Pt nanoparticles are sized between 3–4 nm and are highly dispersed on the support. Transmission electron micrographs show that the individual Pt nanoparticles are covered by an amorphous coating layer – probably hydrous ruthenium oxide, in good agreement with the XPS data. Electrochemical measurements on model electrodes indicate that proton conductivity of the supporting material is strongly affected by interdiffusion of methanol. Nevertheless, initial tests on membrane electrode assemblies (MEAs) showed improved performance, particularly with respect to internal resistance, when compared to Pt-Ru black. The catalyst showed very high activity in CO stripping experiments performed on a full MEA, suggesting high catalyst utilization, despite the comparatively low Nafion® content used in the electrode layer.

Item Type: Article
Erschienen: 2006
Creators: Scheiba, Frieder and Scholz, Manuel and Cao, Lin and Roth, Christina and Cremers, C. and Qiu, X. and Stimming, U. and Fuess, Hartmut
Title: On the suitability of hydrous ruthenium oxide supports to enhance intrinisic proton conductivity in direct methanol anodes
Language: English
Abstract:

Hydrous ruthenium oxides have been investigated as novel support materials for fuel cell electrocatalysts for use in DMFC applications. These oxides were chosen in particular due to their potential intrinsic proton conductivity. Pt nanoparticles have been deposited onto the new support, and the resulting catalysts characterized both structurally and electrochemically. The Pt nanoparticles are sized between 3–4 nm and are highly dispersed on the support. Transmission electron micrographs show that the individual Pt nanoparticles are covered by an amorphous coating layer – probably hydrous ruthenium oxide, in good agreement with the XPS data. Electrochemical measurements on model electrodes indicate that proton conductivity of the supporting material is strongly affected by interdiffusion of methanol. Nevertheless, initial tests on membrane electrode assemblies (MEAs) showed improved performance, particularly with respect to internal resistance, when compared to Pt-Ru black. The catalyst showed very high activity in CO stripping experiments performed on a full MEA, suggesting high catalyst utilization, despite the comparatively low Nafion® content used in the electrode layer.

Journal or Publication Title: Fuel cells
Volume: 6
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Uncontrolled Keywords: DMFC, Hydrous Ruthenium Oxide, Intrinsic Proton Conductivity, Percolation Theory, Support, Three-Phase Boundary
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Erneuerbare Energien
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 20 Nov 2008 08:28
Identification Number: doi:10.1002/fuce.200500238
License: [undefiniert]
Funders: Financial support from the DFG and the Sino-German centre in Dalian in a joint project between the ZAE Bayern (Garching, Germany), the School of Chemistry (Tsinghua University, Beijing, China),, and the Institute of Materials Science (Darmstadt University of Technology, Germany) are gratefully acknowledged.
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