Abstract
Changes in surface mass at a Au electrode during cyclic voltammetry in acidic media were monitored with an electrochemical quartz-crystal microbalance. An unexpectedly large increase in surface mass was observed during the positive potential scan in the pre-oxide region beginning ca. 0.5 V negative of the potential for onset of formation of surface oxide (AuO). This mass increase is virtually independent of the acid and is interpreted on the basis of adsorption of H 2O via hydrogen bonding to the submonolayer of hydrous oxide (AuOH) generated in the pre-oxide region. The mass increase is consistent with an increase in surface hydration by about 32 H 2 O molecules per AuOH site.
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