Abstract
A highly concentrated NaClO_4 as a main supporting electrolyte was used to break hydrogen-bonded water structure in systems studied, by which strong surface-enhanced Raman scattering (SERS) signals of water from silver electrodes were detected in the system having a ten times lower halide concentration than the ordinary one; and a similar phenomenon was also observed in a system containing pseudo-halide SCN~- ions. The SERS spectra obtained in 0.1 mol/L LiCl and 3.0 mol/L LiClO_4 indicate the presence of two kinds of water molecules with very different behaviors on the surface. This peculiar phenomenon is discussed in details. It is achievable to extend SERS study on adsorbed water by adequate choice of electrolyte and control of surface treatment to the electrode in order to have a deeper insight into the complex structure of the electrochemical interface.
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