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Binary Mixtures of Carbon Supported Pt and Ru Catalysts for PEM Fuel Cells

Titelangaben

Mazurek, Marian ; Benker, Nathalie ; Roth, Christina ; Fuess, Hartmut:
Binary Mixtures of Carbon Supported Pt and Ru Catalysts for PEM Fuel Cells.
In: Fuel Cells. Bd. 6 (2006) Heft 3-4 . - S. 208-213.
ISSN 1615-6854
DOI: https://doi.org/10.1002/fuce.200600012

Volltext

Link zum Volltext (externe URL): Volltext

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Electrocatalysts; Fuel Cells; Mixture; Nanoparticles; Non-Alloy; Pt; Ru; TEM; XRD
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Werkstoffverfahrenstechnik
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Werkstoffverfahrenstechnik > Lehrstuhl Werkstoffverfahrenstechnik - Univ.-Prof. Dr. Christina Roth
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften
Titel an der UBT entstanden: Nein
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 05 Dec 2022 08:30
Letzte Änderung: 05 Dec 2022 08:30
URI: https://eref.uni-bayreuth.de/id/eprint/72949