Abstract
An impinging jet electrochemical flow cell developed for use with bead type electrodes was successfully employed in a surface structure sensitive study involving the processes of CO adsorption and oxidation on Pt(111) in 1.0 mol dm −3 H 2SO 4 and HClO 4. The flow cell enabled straightforward CO coverage control by means of varying the dosing time. Anion and hydrogen displacement charge curves with high potential resolution were obtained by means of CO adsorption and an electrolyte dependent fine structure was found. During the dosing of the electrolyte dissolved CO in the potential range 700–800 mV (vs. RHE) a slow delayed oxidation of adsorbed CO was noted and interpreted as being due to adsorption competition between CO and an oxygen containing species. A novel anion–anion displacement method was developed in which adsorbed bisulfate was replaced by perchlorate or water. The negative current transient obtained indicated desorption of bisulfate.
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