Abstract
Carbon monoxide (CO) adsorption on Pd(100) and Pd(111) single crystal electrode surfaces in an aqueous acid solution was studied by FT-IRAS. A surface preparation technique of well-ordered single crystal palladium electrodes was established by using iodine-coating and anneal-quenching of the electrodes. On Pd(111), bridge-bonded (1900–1960 cm −1) and three-fold (1840–1890 cm −1) CO was detected, while only the former species was observed on Pd(100). The structural changes in the CO overlayer were induced by the electrode potential and/or the coverage of CO on the electrode surfaces. The results were compared with those from previous UHV studies.
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