Abstract
Abstract The electrochemical reduction of oxygen has been studied on multi-walled carbon nanotubes (MWCNTs) modified highly oriented pyrolytic graphite (HOPG) electrodes in 0.1 M KOH solution using the rotating disk electrode (RDE) technique. The oxygen reduction behaviour of MWCNTs/HOPG electrodes of various modifications was compared. Electrochemical studies indicate that the MWCNTs/HOPG electrodes show a remarkable electrocatalytic activity towards O 2 reduction in alkaline media. The number of electrons transferred per O 2 molecule was a function of potential and it increased up to four at high negative potentials. The O 2 reduction behaviour of MWCNTs/HOPG electrodes using oxidatively treated MWCNTs was also studied. The oxidative pre-treatment of MWCNTs did not change their electrocatalytic properties for oxygen reduction in alkaline solution to a noticeable degree.
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