The electrochemical reduction of oxygen was studied on silver nanoparticle (AgNP) modified glassy carbon electrode with 1,4-naphthoquinone in the pH range 1.0 – 13.0 by employing cyclic voltammetric, chronoamperometric and chronocoulometric techniques. The stability of the modified electrodes was examined. The influence of pH on the electrochemical and catalytic behaviour of the modified electrode with naphthoquinone was studied, and pH 7.0 was chosen as the optimum working pH by comparing the shift in oxygen reduction potential. The 1,4-naphthoquinone-adsorbed silver nanoparticle modified glassy carbon electrodes possess excellent electrocatalytic abilities for oxygen reduction with over potential 608 mV greater than that at a bare glassy carbon electrode.

Keywords: Catalytic Reduction; Voltammograms; 1,4-Naphthoquinone; Oxygen Reduction;