Surface-enhanced hyper-Raman scattering and surface-enhanced Raman scattering studies of electroreduction of phenazine on silver electrode

摘要

Surface-enhanced hyper-Raman scattering (SEHRS) and surface-enhanced Raman scattering (SERS) have been employed to study phenazine adsorbed on the silver electrode on the silver electrode surface at various negative potentials.It was observed that the scattering spectra of phenazine change drastically in frequencies and inrtensities with the change of applied potential,resulted from the electroreduction of phenazine (P) as the electrode potential moves negatively.The product of the electroreduction, 5,10-dihydrophenazine(PH_2),as well as intermidiate species,monoprotonated phenazine (PH~+),phenazine semiquinone readical (PH) and protonated semiquinone radical(PH_2~+) have been detected by SERS.One of the intermediate species,PH_2~+ radical,was also detected by SEHRS.