Rapid electrochemical preparation of a compact and thick Prussian blue film on composite ceramic carbon electrode from single ferricyanide solution in the presence of HAuCl4

A new method for rapid electrochemical deposition of a compact and thick Prussian blue film on the composite ceramic carbon electrode (CCE) surface from a single ferricyanide solution in the presence of HA(u)Cl(4) was investigated by electrochemical and SEM techniques. The nature of the electrode material and experiment conditions such as the effect of pH, concentration of HAuCl4 as well as the initial concentration of ferricyanide were also studied carefully. The results showed that the formation rate of Prussian blue on the CCE surface was dramatically improved with the addition of HAuCl4. Compared to other substrate material, the formation rate of Prussian blue on the CCE surface from a single acid ferricyanide solution in the presence of HAuCl4 was higher due to the porosity of the sol-gel material and the surface roughness. Furthermore, this Prussian blue modified electrode showed high stability and excellent electrocatalytic activity to hydrogen peroxide. The present method was convenient and rapid for the preparation of a compact and thick Prussian blue film compared to other method reported previously. (c) 2007 Elsevier B.V. All rights reserved.