OXIDATION OF HYDROSULFIDE IONS ON GOLD .2. CHARACTERIZATION OF GOLD AQUEOUS HYDROSULFIDE SOLUTION INTERFACE

The results of studies to characterize the gold/aqueous hydrosulphide solution interface are presented in this paper. The interface was characterized with impedance spectroscopy, contact angle and cathodic charge transfer measurements. The studies complement the cyclic voltammetry investigations presented in Part I. A detailed mechanism of the oxidation and reduction of sulphur species at gold electrodes has been suggested on the basis of this investigation. The results show that the surface becomes hydrophobic under the conditions when polysulphide ions or elemental sulphur are present at the interface. © 1990 Chapman and Hall Ltd.