Electrochemical kinetics of chloride-ion oxidation at a bright platinum electrode

Abstract

A typical irreversible chronopotentiometric curve at a smooth platinum anode is obtained when chloride ion (>10−1 M) is oxidized at high current densities (>4 mA/cm2). A graphical method of determining transition time for this reaction is described and the derived diffusion coefficient for chloride ion is compared with that obtained by other workers. Electrochemical kinetic parameters have also been determined for chloride-ion oxidation at high current densities. At higher concentrations of chloride ion, it appears that chloride oxidation takes place at a platinum surface chloride rather than a surface oxide.