Site-specific voltage control of adsorption on glassy carbon electrodes

The influence of applied potential on the adsorption of organic compounds on glassy carbon (GC) electrodes has been examined using electrochemically modulated liquid chromatography (EMLC). The results not only confirm that the extent of adsorption is site dependent [Anal. Chem. 69 (1997) 4680], but also demonstrate for the first time that these sites exhibit differences in their potential dependence of adsorption. The results additionally reveal how the extent of adsorption is affected by the supporting electrolyte. Together, these results demonstrate the power of EMLC to serve as a tool for unraveling fundamental issues regarding adsorption on carbonaceous and other electrified interfaces.