Electrokinetic and Impedimetric Dynamics of FeCo-Nanoparticies on Glassy Carbon Electrode

Abstract

The electrochemical dynamics of a film of FeCo nanopar.t.icles were studied on a glassy ;. carbon electrode (GCE). The film was found to be electroactive in 1 M LiCI04 containing 1: I v/v ethylene carbonate - dimethyl carbonate electrolyte system. Cyclic voltammetric experiments revealed a diffusion-controlled electron transfer process on the GCE/FeCo electrode surface. Further interrogation on the electrochemical properties of the FeCo nanoelectrode in an oxygen saturated 1 M LiCI04 containing 1:1 v/v ethylene-carbonate-dimethyl carbonate revealed that the nanoelectrode showed good response towards the electro-catalytic reduction of molecular oxygen with a Tafel:t slope of about 120 fnV which is close to the theoretical 118 mV for a single electron transfer process in the rate limiting step; and a transfer coefficient (a) of 0.49. The heterogeneous rate constant of