SURFACE ENHANCED RAMAN SPECTROSCOPIC STUDIES ON COADSORPTION

Coadsorption in electrochemistry is a complex phenomenon involving seveeral interactions of two or more than two species with the electrode surface. It is difficult to investigate coadsorption with conventional electrochemical techniques that inevitably measure the sum of all the processes at the electrode/solution interfaces. In this article surface enhanced Raman spectroscopy (SERS) ([1-3]) has been used to characterize the nature of the coadsorption process as the SER signals of these coadsorbed species can be detected simultaneously([4]). By analysing relations of the SER spectra and the electro-chemical parameters, it is possible to classify coadsorption as two aspects, parallel coadsorption and induced coadsorption. Moreover, the latter can be further divided into two groups, induced chemical coadsorption and induced physical coadsorption.