Abstract
The behavior of gold in aqueous potassium hydroxide was studied using potentiodynamic methods. Three peaks found at potentials more negative than the gold (III) oxide formation region were identified as adsorption reactions. These reactions were shown to depend on the hydroxyl ion in solution. The following reaction was proposedEach of the peaks was found to correspond to the formation of only a monolayer of adsorbed species, with each peak being restricted to a particular type of surface site. By means of the work function values and the ease of oxidation of the three most common crystal planes, the peaks at −1.2 to −0.7V vs. SCE, −0.7 to −0.3V vs. SCE, and −0.3 to +0.3V vs. SCE were identified with monolayer hydroxide adsorption on the (110), (100), and (111) crystal faces, respectively.
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