AN FTIR STUDY ON THE ADSORPTION OF ACETATE AT THE BASAL PLANES OF PLATINUM SINGLE-CRYSTAL ELECTRODES

In-situ Fourier transform IR spectroscopy has been employed to study the adsorption of acetate on Pt(100), Pt(110) and Pt(111) electrodes. A characteristic band associated with the adsorbed acetate species is observed on all three surfaces near 1420 cm(-1). This band corresponds to the C-O symmetric stretching vibration of the COO group twofold coordinated to the surface. The potential dependence of the band intensity, band halfwidth and band center shift depend on the basal plane considered. The spectroscopic parameters are correlated with the shape of the voltammograms obtained with the respective surface in the acetate-containing solution.