A study of electrochemical process of Fe(CN)(6)(3-)/Fe(CN)(6)(4-) on gold electrode by electrochemical quartz crystal impedance system

Admittance spectra of quartz crystal resonance were measured in situ in the electrochemical process of Fe(CN)(6)(3-)/Fe(CN)(6)(4-) on Au electrode in 1.0 mol/L Na2SO4 aqueous solution using an electrochemical quartz crystal i mpedance system, Changes in motional resistance R-1 were well reversible wi th potential, but resonant frequency f(o) series resonant frequency f(s) an d parallel resonant frequency f(p) had significant rising drifts besides so mewhat reversible changes with potential. It is concluded that changes in R -1 were caused by variations in solution density and viscosity near electro de surface, but frequency responses resulted from both changes of solution properties and corrosion of Au electrode in anodic process.