Electrocatalytic activity of a cobalt hexacyanoferrate modified glassy carbon electrode toward ascorbic acid oxidation

A cobalt hexacyanoferrate (CoHCF) modified glassy carbon (CoHCF/GC) electro de was prepared electrochemically. The voltammetric responses of CoHCF are stable and the electrochemical behaviour is related to the concentrations o f supporting electrolyte and counterions. The CoHCF/GC electrode shows elec trocatalytic activity toward the oxidation of ascorbic acid in phosphate bu ffer solution. The electrocatalytic rate constant of the CoHCF/GC electrode for the oxidation of ascorbic acid is determined using rotating disk elect rode measurements. (C) 2000 Elsevier Science S.A. All rights reserved.