ELECTROCHEMICAL-BEHAVIOR OF PT(100), PT(111) AND PT POLYCRYSTALLINE SURFACES IN HYDROGENCARBONATE SOLUTION

It was demonstrated that adsorbed CO is obtained from the reduction of NaHCO3 solution when Pt(100), Pt(110), disordered Pt(111) and polycry stalline electrodes are employed. Reduction of CO2 coming from the dis sociation of the hydrogencarbonate anion is proposed as the reaction t hat produces CO. By using Fourier transform infrared spectroscopy, lin ear and multi-bonded CO were detected on polycrystalline platinum elec trodes. The shape of the band associated with linearly adsorbed CO is monopolar as a consequence of the partial overlapping, at lower wavenu mbers, of the absolute bands at both potentials (0.05 and 0.35 V).