Mazurek, Marian ; Benker, Nathalie ; Roth, Christina ; Fuess, Hartmut (2006)
Structural and electrochemical investigation of binary mixtures of carbon-supported Pt and Ru catalysts for PEM fuel cells.
In: Fuel cells, 6 (3-4)
doi: 10.1002/fuce.200600012
Artikel, Bibliographie
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 |
| Art des Eintrags: | Bibliographie |
| Titel: | Structural and electrochemical investigation of binary mixtures of carbon-supported Pt and Ru catalysts for PEM fuel cells |
| Sprache: | Englisch |
| Publikationsjahr: | August 2006 |
| Verlag: | WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Fuel cells |
| Jahrgang/Volume einer Zeitschrift: | 6 |
| (Heft-)Nummer: | 3-4 |
| DOI: | 10.1002/fuce.200600012 |
| 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. |
| Freie Schlagworte: | Electrocatalysts, Fuel Cells, Mixture, Nanoparticles, Non-Alloy, Pt, Ru, TEM, XRD |
| Zusätzliche Informationen: | Special Issue: Novel Layer Structures for Fuel Cells |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Erneuerbare Energien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Strukturforschung |
| Hinterlegungsdatum: | 20 Nov 2008 08:25 |
| Letzte Änderung: | 20 Feb 2020 13:23 |
| PPN: | |
| 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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