Research Article

Electrochemical Determination of Dopamine on a Glassy Carbon Electrode Modified by Using Nanostructure Ruthenium Oxide Hexacyanoferrate/Ruthenium Hexacyanoferrate Thin Film

Figure 5

Equivalent circuits used for approximation of the EIS data: (a) the bare GC and (b) GC/RuOHCF/RuHCF electrodes in the presence of DA (external probe). Warburg element considers the possible contribution of DA in the solution phase at very low frequency. The double-layer capacitance is replaced by constant phase element CPE.