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Electrochemical impedance and x-ray absorption spectroscopy (EXAFS) as in-situ methods to study the PEMFC anode

Mazurek, Marian and Benker, Nathalie and Roth, Christina and Buhrmester, Thorsten and Fuess, Hartmut (2006):
Electrochemical impedance and x-ray absorption spectroscopy (EXAFS) as in-situ methods to study the PEMFC anode.
In: Fuel cells, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, pp. 16-20, 6, (1), [Article]

Abstract

The effect of alloy formation on the performance of carbonsupported Pt and Ru fuel cell catalysts has been investigated by electrochemical impedance spectroscopy (EIS), X-ray absorption spectroscopy (EXAFS) and fuel cell tests. The CO tolerance of the respective anode electrocatalysts has been tested in both reformate and methanol operation. This paper describes results for mixtures of carbon-supported Pt and carbon-supported Ru catalysts. The particle sizes of the active metals have been modified by heat-treatment in nitrogen. It has been observed that the size of Pt and Ru particles has a significant influence on the electrochemical performance, the activity improving for smaller Ru particles. The performance of certain Pt-Ru mixtures in a single cell fuel cell is comparable with an alloy catalyst.

Item Type: Article
Erschienen: 2006
Creators: Mazurek, Marian and Benker, Nathalie and Roth, Christina and Buhrmester, Thorsten and Fuess, Hartmut
Title: Electrochemical impedance and x-ray absorption spectroscopy (EXAFS) as in-situ methods to study the PEMFC anode
Language: English
Abstract:

The effect of alloy formation on the performance of carbonsupported Pt and Ru fuel cell catalysts has been investigated by electrochemical impedance spectroscopy (EIS), X-ray absorption spectroscopy (EXAFS) and fuel cell tests. The CO tolerance of the respective anode electrocatalysts has been tested in both reformate and methanol operation. This paper describes results for mixtures of carbon-supported Pt and carbon-supported Ru catalysts. The particle sizes of the active metals have been modified by heat-treatment in nitrogen. It has been observed that the size of Pt and Ru particles has a significant influence on the electrochemical performance, the activity improving for smaller Ru particles. The performance of certain Pt-Ru mixtures in a single cell fuel cell is comparable with an alloy catalyst.

Journal or Publication Title: Fuel cells
Volume: 6
Number: 1
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Uncontrolled Keywords: EIS, EXAFS, Mixture, PEMFC
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 08:25
Additional Information:

Special Issue: 2nd France – Deutschland Fuel Cells Conference

License: [undefiniert]
Funders: Financial support of the Deutsche Forschungsgemeinschaft is gratefully acknowledged., M. Mazurek is supported by a Graduiertenstipendium des Landes Hessen.
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