By utilizing SERS (Surface-enhanced Raman Scattering) technique and a confocal microprobe Raman system, the dissociation of methanol on a roughened platinum electrode in nanoqueous system was investigated. It is found that upon the dissociation of methanol on a roughened platinum electrode, carbon monoxide exists on the surface as the poisoning intermediate. At relative negative potentials, H may coadsorb with CO on the electrode surface, and thus influence the spectral feature of CO signal. Positive movement of the potential, the variation of ν~P~t~-~C can be explained by the electrochemical Stark effect while the change of ν~C~-~O can be interpreted by the combination of the electrochemical stark effect and the dipole-dipole coupling effect.

Key words: METHANOL, PLATIMUM ELECTRODE, DISSOCIATION, ADSORPTION, SURFACE ENHANCED RAMAN SCATTERING