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Nanoscale Topography of GC/Pt-C and GC/Pt-Ru-C Electrodes Studied by Means of STM, AFM and XRD Methods

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Abstract:

Electrodes, assigned as GC/Pt-C and GC/Pt-Ru-C, were formed by deposition of Ptbased catalysts (47.5 wt % Pt + high surface area carbon) and (54 wt. % Pt-Ru alloy + high surface area carbon) on glassy carbon (GC) discs. X-ray diffraction measurements were used for the determination of the average crystallite size and phase composition of both catalysts. Crystallite size for Pt-C catalyst was 2.9 nm for Pt-fcc. In the diffraction pattern of the Pt-Ru-C catalyst two phases, e.g. Pt-Ru-fcc and Ru-hcp were refined using the Rietveld method. Crystallite sizes were 3.9 nm for Pt-Ru-fcc and 2.8 nm for Ru-hcp. STM observations of the surface of GC/Pt-C and GC/Pt-Ru-C electrodes revealed the presence of metal particles of the size in the range 2-6 nm and Pt-C or Pt- Ru-C agglomerates in the range of several tenth of nm. The thickness of the Nafion covering layer determined by AFM is ca. 100 nm. A simplified scheme of the investigated electrodes was created.

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Periodical:

Materials Science Forum (Volume 518)

Pages:

271-276

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.518.271

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Online since:

July 2006

Authors:

A. Kowal, P. Olszewski, D.V. Tripković, R. Stevanović

Keywords:

Atomic Force Microscope (AFM), Glassy Carbon, Pt Catalyst, Pt-Ru Catalyst, STM, X-Ray Diffraction (XRD)

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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