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Pt Electrodes Modified by Ruthenium A Study in Tolerance

5 M HiSQ). Ruthenium packii dnisity was 0.22, 0.23. 036v 0.40, respectively. (AS Waszczuk eiat Cc iyright 2001 by Academic Press) [Pg.30]

In order to try to better understand the mechanism of enhanced CO tolerance, we undertook a C NMR investigation of chemisorbed CO on these Ru modified electrode surfaces. C NMR spectra recorded in a 14.1 T magnetic field showed the presence of two broad peaks for [Pg.31]

Double-Gauasian Deconvolution ofNMR Data and the Corresponding T, Data. [Pg.34]

The first term is the standard Korringa contribution in which T is the absolute temperature and a is the Korringa constant, obtained from the straight line fit at T 200 K. The second term accounts for surface [Pg.34]

From the EC-NMR data, we conclude that diffusion of CO on Pt/Ru islands is fast and that the exchange between these two different [Pg.36]

In order to try to better understand the mechanism of enhanced CO tolerance, we undertook a C NMR investigation of chemisorbed CO [Pg.31]

6 kHz and 5.7, 4.9, and 5.1 kcal/mol, for Pt/Ru-14, Pt/Ru-35, and Pl/Ru-52, respectively. For comparison, the activation energy for CO diffusion on pure Pt under the same electrochemical conditions has been previously determined to be 7.8 kcal/mol. Clearly, the presence of Ru substantially enhances surface diffusion for the CO molecules on Pt/Ru sites, but for the Pt sites, the effects are very small. Thus, COs bound to Ru are more mobile than those adsorbed on Pt and [Pg.35]


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