SERS investigation on the dissociation of methanol on a roughened Pt electrode in nonaqueous system

By utilizing SERS (Surface - enhanced Raman Scattering) technique and a con focal microprobe Raman system, the dissociation of methanol on a roughened platinum electrode in nonaqueous 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, PI 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 nu (pt-C) can be explained by the electrochemic al Stark effect while the change of nu (C-O) can be interpreted by the comb ination of the electrochemical Stark effect and the dipole - dipole couplin g effect.