Abstract
The infrared absorption intensities of linear CO(a) derived from CO, CH 3OH and HCOOH, respectively, on a platinum electrode in 0.5 M H 2SO 4 were determined as a function of the total adsorbate coverage. The intensity of the CO(a) derived from HCOOH almost coincides with, although slightly lower than, that of the CO(a) derived from CO throughout the coverage range lower than ca. 0.9. The intensity of the CO(a) derived from CH 3OH almost coincides with that of CO(a) from CO only in the low coverage range. With increasing coverage from ca. 0.3, however, the intensity of the CO(a) from CH 3OH becomes progressively lower than that of the CO(a) from CO. It has been confirmed, based on quantitative comparison of the infrared absorption intensities, that the linear CO(a) derived from CH 3OH and HCOOH is in fact the predominant surface species on a smooth platinum electrode in acidic medium. However, the presence of minor surface species besides linear CO(a) has also been indicated from the intensity data.
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