Study of Hexylamine Adsorption on Platinum by Chronoamperometric Method

Abstract

The kinetics of the redox Fe2+/ Fe3+ reaction on a platinum electrode in 1 M HClO4 was studied by the chronoamperometric method in the presence of the hexylamine surfactant. The main kinetic characteristics of the reaction have been estimated. The dependence of the exchange current density on the hexylamine concentration was analyzed. It was found that the hexylamine adsorption on platinum is described by the Dhar-Flory-Huggins isotherm. It is shown that the hexylamine adsorption on platinum is mainly due to the hydrophobic effect of the hexylamine molecules interaction with polar water molecules.