Abstract:

The behavior of the UPD of Sb(Ⅲ) at a platinum anode has been systematically studied using various electrochemical techniques such as potential sweep, potential step, and differential capacity in order to better understand the effects of the UPD of Sb (Ⅲ) on the electrocatalytic activity of the substrate.
Experiments show that the UPD of Sb(Ⅲ) can take place on the surface of poly crystalline platinum. The amount of the adsorbed antimony by UPD and the dissolved antimony by anodic oxidation depends upon the potential applied. At potential greater than Eeq, antimony adsorbed atoms axe formed. As the potential becomes more positive, the amounts of the adsorbed antimony atoms decrease and a complete oxidative stripping occurs at a potential greater than 0.90V.It has been found that eath antimony adsorbed atom occupies three sites of platinum.

Key words: Antimony(III), Platinum electrode, Underpotential deposition