H2 and CO electrooxidation on well-characterized Pt, Ru, and Pt-Ru. 1. Rotating disk electrode studies of the pure gases including temperature effects

H. A. Gasteiger, N. M. Markovic, P. N. Ross

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Abstract

We discuss the electrooxidation of both CO and H2 on well characterized Pt, Ru, and Pt-Ru rotating disk electrodes in 0.5 M H2SO4 at room temperature and at 62°C. We focus on the mechanism and the kinetics of CO oxidation on Ru and Pt-Ru electrodes under well-defined mass transfer conditions, highlighting the expected differences from measurements on the oxidation of preadsorbed monolayers of CO in CO-free electrolyte. Analysis of the catalytic activity displayed by Pt, Ru, and Pt-Ru surfaces for the oxidation of the pure gases, H2 and CO is used as the basis for understanding the oxidation of H2/CO mixtures, which will be presented in Part 2. Finally, our previously proposed mechanism for the oxidation of both methanol and formic acid on Pt-Ru electrodes is reassured on the basis of measurements with H2 and CO.

Original languageEnglish
Pages (from-to)8290-8301
Number of pages12
JournalJournal of Physical Chemistry
Volume99
Issue number20
DOIs
StatePublished - 1995
Externally publishedYes

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