**2.2.1 Electrodes**

22 Electropolymerization

and other type of electrodes [Iotov, & Kalcheva, 1998; Ezerskis & Jusys, 2002]. Deactivation of electrode due to the phenol polymerization is more characteristic in alkaline medium. Insoluble high molecular weight species block the electrode surface and prevent effective

In the present work, we seek to contrast the electro-oxidation of OCP and OHP from aqueous H2SO4 medium as electrolyte using cyclic voltammetry technique. The kinetic study of the oxidation processes will be useful for optimize the parameters control it. Mechanisms of the electrochemical polymerization will be discussed using electrochemical data. Also, the characterization of the obtained polymer films were carried out by elemental analysis, TGA, SEM, XRD, IR, UV-vis., 1H-NMR spectroscopy. We hope to have films with

OCP was obtained from Hopkin & Williams (Dagenham, Essex, UK), Sulfuric acid, K2HPO4, KHphthalate, Borax, NaOH, Hydrochloric acid and NaHCO3 were provided by Merck (Darmstadt, Germany). OHP and MB dye was provided by Aldrich. All chemicals are of analytical pure grade and used as received. All solutions were prepared by using freshly

Electropolymerization of the monomers and formation of the polymer films was carried out using potentiodynamic technique. The cell used is shown in Fig. (1). This cell is made from transparent Prespex trough, which has the inside dimensions of 8cm length, 2.5cm width

Fig. 1. Three electrode cell used for electropolymerization and cyclic voltammetry measurements. Were CE is counter electrode, WE is working electrode, SB is salt bridge,

SCE is the standard calomel electrode and RE is the reference electrode.

good characters to be used in applications (i.e. dye removal and pH sensor).

electrooxidation of phenol.

**2. Expermental** 

double-distilled water

and 3cm height.

**2.2 Electropolymerization cell** 

**2.1 Materials** 
