Studies of oxidation Processes of Adsorbed and Solution CO on Pt (110) Electrode by Cyclic Voltammetry and in situ FTIRS

摘要: The oxidation processes of adsorbed CO (COad) and solution phase CO (COsol) on Pt (110) electrode were investigated by cyclic voltammetry and in-situ FTIR spectroscopy. It has revealed that in comparison with COad on Pt (110) in a CO-free solution, the oxidation current peak of COsol in a CO-saturated solution is positively shifted ca. 168 mV, and the peak current density has been increased by 6. 70 times. Linear adsorbed CO (COL) is determined by in-situ FTIR spectroscopy as the main species, which is uniformly distributed on Pt (110) surface. In a CO-free solution, the onset potential of COL is measured by in-situ FTIRS ca. 0. 15 V; the COL band is blue-shifted with the increase of electrode potential in the potential range where COL is stable, yielding a Stark tuning rate 30 cm-1· V-1; when the COL is oxidized at E> 0. 15 V, the COL band is red-shifted at a rate of-56 cm-1· V-1. In the case of CO-saturated …