Synthesis and characterisation of ternary Pt/Ru/Mo catalysts for the anode of the PEM fuel cell

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Benker, Nathalie ; Roth, Christina ; Mazurek, Marian ; Fuess, Hartmut:
Synthesis and characterisation of ternary Pt/Ru/Mo catalysts for the anode of the PEM fuel cell.
In: Journal of New Materials for Electrochemical Systems. Bd. 9 (2006) Heft 2 . - S. 121-126.
ISSN 1480-2422

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Abstract

Miscellaneous compositions of carbon-supported Pt/Ru/Mo catalysts were synthesised via reductive precipitation using hydrazine. The precipitation of the different Pt/Ru/Mo catalysts was carried out with H2PtCl6, RuCl3 and Mo(CO)6 as precursors for synthesis I and (NH4)6Mo7O24 for synthesis II. The home-made catalysts were structurally characterised with different methods before and after electrochemical investigation in a membrane fuel cell. Furthermore cyclic voltammetry was perfomed to determine the catalytic activity of the different Pt/Ru/Mo catalysts. X-ray fluorescence analysis (XFA), X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDXS) demonstrate that the precursor used in synthesis I is not adequate for the preparation of ternary Pt/Ru/Mo catalysts. Transmission electron microscopy (TEM) images of the differently prepared catalysts show the formation of 20 nm agglomerates composed of 2-3 nm crystallites, which separate into individual nanoparticles during fuel cell operation. The particle size was determined with TEM and X-ray diffraction (XRD), and is independent of the Pt/Ru/Mo ratio. No significant particle growth is observed after operation.