Voltammetric approach to multicomponent electrochemical systems at platinum electrode surfaces

Abstract

Adsorption interactions of different systems on electrodispersed and smooth platinum electrodes were explored through anodic stripping voltammetry using a conventional flow cell technique at 25°C. A first adsorbate was formed at the platinum electrode in contact with the solution containing the adsorbable species I, and subsequently the platinum—adsorbate I system was put into contact with a solution containing the adsorbable species II, where I  CO, CH 3OH and reduced CO 2, and II C 2H 4, C 2H 2 and CO, and vice versa. The anodic stripping voltammograms revealed either a total or partial displacement of adsorbate I by adsorbate II, or chemical interactions among adsorbed residues I and Il. The following decreasing platinum—adsorbate interaction sequence was established C 2H 2-2 > CO > C 2H 4 > CH 3OH ≈ CO 2.