Abstract
The effect of chloride (from 10ppm to 100ppm) on platinum dissolution during potential cycling in 0.5M H2SO4 solution at 25°C is investigated using a channel flow double electrode. The dissolved platinum in the form of Ptn+ or a Pt chloro complex produced at the upstream electrode is reduced at the downstream electrode. The introduction of 10ppm of chloride does not have a significant effect during potential cycling until 1.05V in the anodic scan; however, above this potential even 10ppm of chloride has a prominent effect. Higher chloride concentration has a negligible effect in a lower potential range; however, at a higher potential, the dissolution increases by 35-fold. Dissolution of Pt in the form of Ptn+ and PtCl42− is proposed below 1.2V and that in the form of PtCl62− is proposed above 1.2V in the anodic scan. Furthermore, a platinum chloro complex is formed electrochemically during cathodic scan. Quantitative analysis is performed and a linear dependence of platinum dissolution with chloride concentration is observed.
Published Version
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