Abstract
The interfacial properties of gold electrode in sulfate solutions of different pH values have been investigated from the piezoelectric response of surface stress change induced by a potential modulation. The potential of electrocapillary maximum,, obtained from the piezoelectric signals is independent of pH in acidic and neutral range but shifts to the less noble direction at pH higher than 8. The piezoelectric signals could sensitively respond to the structual changes of electric double layer which are ascribed to the reorientation of water dipoles in acidic solution and the charge transfer of electrosorbed OH− ions in alkaline solution. It is expected that the sign of surface charge of gold electrode in alkaline solution changes gradually from plus to minus at the high anodic potential of oxide formation. It seems that the sign reversal of surface charge is associated with the aging process of hydrous oxide, , initially formed on gold.
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