Abstract
We report on carbon monoxide adsorption on the Pt(100) electrode in CO-saturated perchloric and sulfuric acid solutions studied by a combination of low-energy electron diffraction, Auger electron spectroscopy, and electrochemistry. We have developed an experimental method that produces accurate CO coverages making use of a capacitive current generated due to iodine adsorption at a constant electrode potential. Using this method, we have obtained the saturation CO coverage equal to 0.77±0.04 ML, in a good agreement with the quantitative Auger electron spectroscopy result of 0.79±0.09 ML. The LEED analysis of the saturation CO structure that corresponds to the 0.77 ML coverage gives rise to the Pt(100)c(4×2) surface structure, as in earlier gas-phase studies of the equivalent surface system
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