Three-electrode potentiostated system

Most laboratory setups employ a three-electrode potentiostated system to ensure effective potential control and to maximize the reproducibility of the polymerization process. The positioning of the auxiliary electrode is critical in that it determines the electrical field generated, which can influence the quality and evenness of the polymer deposited. The electrode system shown in Figure 2.2 includes a reference electrode. A two-electrode cell can also be used, usually with galvanostatic (constant current) electropolymerization methods, but care must be taken to avoid overoxidation of the PPy through poor control of the potential. 

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