Abstract:

A polymer film of hemin was obtained on a graphite carbon electrode by cyclic voltammetric method in aqueous solution. Cyclic voltammograms of the film electrode in 0.1 mol•L-1 NaOH exhibited two pairs of stable and reversible redox waves with peak formal potential at -730 mV and 530 mV respectively. For thicker films at faster potential scan rates, peak currents proportional to (scan rate)1/2 means charge transport is controlled by diffusion in the films. Protonated films have anionic exchange properties. The poly-hemin electrode shows good electrocatalytic reduction capacity for oxygen. After a long period reduction of oxygen, the electroactivity of film was diminished.

Key words: Modified electrode, Hemin, Electrocatalysis, Oxygen reduction, Polymer film