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Structural and electrochemical investigation of binary mixtures of carbon-supported Pt and Ru catalysts for PEM fuel cells

Mazurek, Marian ; Benker, Nathalie ; Roth, Christina ; Fuess, Hartmut :
Structural and electrochemical investigation of binary mixtures of carbon-supported Pt and Ru catalysts for PEM fuel cells.
In: Fuel cells, 6 (3-4) pp. 208-213.
[Artikel], (2006)

Kurzbeschreibung (Abstract)

Commercially available carbon-supported pure Pt and pure Ru catalysts were heat treated in order to modify their individual particle sizes, mixed in a mortar and tested for their suitability as anode catalysts in polymer electrolyte fuel cells (PEMFCs). The procedure chosen for mixing monometallic catalysts should bring more flexibility to the preparation of catalysts, which could thus be easily adjusted to the working conditions. The catalyst mixtures were structurally characterized using a combination of X-ray diffraction (XRD) and transmission electron microscopy (TEM), and indicated an increase in particle size with heat treatment temperature, while the size distribution remained sufficiently narrow. The particle size effect on the resulting activity of the catalyst mixtures was investigated by current-voltage measurements (U/i curves) in single cell fuel cells. A mixture of the as-received platinum and ruthenium gave the best results, which was almost comparable to a commercial Pt-Ru alloy catalyst purchased from E-TEK inc. Only a minor decrease in cell performance was seen during long term operation. Following operation, the X-ray diffraction patterns show reflections of the Pt fcc phase, but not the hcp Ru phase. This may be explained by leaching of the pure ruthenium catalysts and re-decoration on Pt nanoparticles, or by formation of an amorphous Ru oxide or, less likely, Pt-Ru alloy during operation. However, these structural changes do not seem to significantly affect the cell performance.

Typ des Eintrags: Artikel
Erschienen: 2006
Autor(en): Mazurek, Marian ; Benker, Nathalie ; Roth, Christina ; Fuess, Hartmut
Titel: Structural and electrochemical investigation of binary mixtures of carbon-supported Pt and Ru catalysts for PEM fuel cells
Sprache: Englisch
Kurzbeschreibung (Abstract):

Commercially available carbon-supported pure Pt and pure Ru catalysts were heat treated in order to modify their individual particle sizes, mixed in a mortar and tested for their suitability as anode catalysts in polymer electrolyte fuel cells (PEMFCs). The procedure chosen for mixing monometallic catalysts should bring more flexibility to the preparation of catalysts, which could thus be easily adjusted to the working conditions. The catalyst mixtures were structurally characterized using a combination of X-ray diffraction (XRD) and transmission electron microscopy (TEM), and indicated an increase in particle size with heat treatment temperature, while the size distribution remained sufficiently narrow. The particle size effect on the resulting activity of the catalyst mixtures was investigated by current-voltage measurements (U/i curves) in single cell fuel cells. A mixture of the as-received platinum and ruthenium gave the best results, which was almost comparable to a commercial Pt-Ru alloy catalyst purchased from E-TEK inc. Only a minor decrease in cell performance was seen during long term operation. Following operation, the X-ray diffraction patterns show reflections of the Pt fcc phase, but not the hcp Ru phase. This may be explained by leaching of the pure ruthenium catalysts and re-decoration on Pt nanoparticles, or by formation of an amorphous Ru oxide or, less likely, Pt-Ru alloy during operation. However, these structural changes do not seem to significantly affect the cell performance.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Fuel cells
Band: 6
(Heft-)Nummer: 3-4
Verlag: WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Freie Schlagworte: Electrocatalysts, Fuel Cells, Mixture, Nanoparticles, Non-Alloy, Pt, Ru, TEM, XRD
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Erneuerbare Energien
Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Strukturforschung
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 20 Nov 2008 08:25
Zusätzliche Informationen:

Special Issue: Novel Layer Structures for Fuel Cells

ID-Nummer: 10.1002/fuce.200600012
Sponsoren: Financial support of the Deutsche Forschungsgemeinschaft (SPP “Neue Schichtstrukturen für Brennstoffzellen”) is gratefully acknowledged., M. Mazurek acknowledges a Graduiertenstipendium des Landes Hessen., The authors thank Prof. H. Wendt for helpful discussions.
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