On the adsorption of uridine at the Ag(lll)/aqueous solution interface

The adsorption of uridine at an Ag(lll) single-crystal electrode has been i nvestigated by means of cyclic voltammetry and of double-layer capacitance versus potential measurements. Up to four different interfacial regions may be distinguished. One of these regions can be assigned to a well-organized physisorbed monolayer and another one, detected at more positive potential s, may be associated with a chemisorbed layer. The kinetics of the interfac ial rearrangements were investigated by recording current-time curves. When single potential steps are applied starting from the chemisorbed layer, th e transients are predominantly associated with the dissolution of the initi al layer. Those transients have been analyzed in terms of a model which com bines a Langmuir-type desorption step and a dissolution which proceeds from holes growing with a time-dependent rate. (C) 1999 Elsevier Science Ltd. A ll rights reserved.