Abstract
The electrocatalytic reduction of dioxygen has been studied by cyclic voltammetry and chronoamperometry at a glassy carbon electrode and a carbon microelectrode modified with Schiff base Co(II) complex in a dioxygen saturated 1 M KOH aqueous solution of various pH and temperature. The electrochemical reduction of dioxygen at the modified electrode establishes a pathway of two-electron reduction to form hydrogen peroxide. The reduction potential (EP) of dioxygen shows pH dependence. The electrochemical reduction of dioxygen is irreversible and diffusion controlled. The activation energy obtained from Arrhenius plots for the reduction of dioxygen was 3.64 Kcal/mol at the bare glassy carbon electrode, whereas it was 2.51 Kcal/mol at the modified glassy carbon electrode.
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