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Simulated ‘air bleed’ oxidation of adsorbed CO on carbon supported Pt: Part I. A differential electrochemical mass spectrometry study by Z Jusys; J Kaiser; R.J Behm is a Engineering article available to read on EtoBox.

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The reactions of adsorbed CO on a carbon supported Pt catalyst (20% Pt/Vulcan) with O 2 in a 2% O 2 /Ar saturated electrolyte at potentials of 0.06 V and for comparison, at 0.26 V RHE are investigated by differential mass spectrometry under continuous flow conditions. Under these conditions, which are typical for an air bleed operation of polymer electrolyte fuel cell (PEFC) anodes, and on a CO saturated Pt/Vulcan, catalyst the reaction is found to be extremely slow, on the order of 10 (5 monolayers s (1 . Only a very small fraction, about 10 (4 , of the consumed O 2 is used for CO oxidation, while the major fraction reacts via the competing oxygen reduction reaction, either in a four-electron reaction to H 2 O or, more likely, in a two-electron reaction to H 2 O 2 . CO stripping experiments confirm that at 0.06 V RHE O 2 reduction is possible even on a completely CO saturated Pt/Vulcan catalyst at a rate limited by O 2 transport. This is tentatively attributed to H 2 O 2 formation on the Vulcan support, which cannot be reduced to H 2 O on the CO covered Pt particles. At higher potentials, at 0.26 V RHE , the reaction rate is much higher, by a factor of about 100 for the CO saturat

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Author

Z Jusys; J Kaiser; R.J Behm

Publisher

Elsevier ; Elsevier BV (ISSN 1572-6657)

Published

2003

Language

EN

Field

Engineering (Physical Sciences)