Abstract
The electromotive force (emf) of solid electrolyte concentration cells used in CO + O 2 nonequilibrium conditions has been studied by comparing the behavior of the reaction rate and emf for deposited Pt with that of the reaction rate and surface concentration of CO (as determined by infrared spectroscopy) for dispersed Pt. It was confirmed that the emf is generated by a mixed electrode potential involving electrochemical reactions of O 2− with the CO and oxygen adsorbed on Pt during CO oxidation on Pt. Taking this mechanism as a basis for investigation, surface CO was detected even under conditions where CO was very scarce compared to oxygen. This indicates that CO oxidation on Pt proceeds via a Langmuir-Hinshelwood mechanism involving surface reaction between adsorbed species over the whole range of gas composition. Oscillations in emf, rate, and surface concentration of CO shown over a certain range of gas composition were presumed to be caused by the surface state where CO adsorbed on Pt became mobile.
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