By E. Schab-Balcerzak
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4 (a)). Fig. 4. 6M H2SO4 at 303 K with scan rate 25 mVs-1 28 Electropolymerization This means that, surface area of electrode is not affected by the H2 adsorption where, in presence of monomers (OCP or OHP) the data reveal that, during the second cycle both the oxidation and the reduction peak currents decrease significantly with repetitive cycling. This behavior is observed elsewhere as a result of fouling of electrode [Arslan et al, 2005] where phenolic products block the electrode surface and the formed film hinders diffusion of further phenoxide ions to the electrode surface, thereby causing a significant decrease in the anodic peak current and also decrease the cathodic peak current.
85 Table 7. the potentiometric response of POCP modified electrode with different thickness at different range of pH. Electropolymerization of Some Ortho-Substituted Phenol Derivatives on Pt-Electrode from Aqueous Acidic Solution; Kinetics, Mechanism, Electrochemical Studies and Characterization of… 43 From Figure 15 and Table 7, it is clear that the calculated potentiometric slope decreased as the polymer film thickness increased. 60 mV/pH, this decrease may be attributed to the diffusion rate of hydrogen ion across this modified electrode.
21. Langmiur and Frendlich isotherms for adsorption of MB dye on POHP. 4. Conclusions Cv is useful tool in oxidation of pollutants as phenols. The electropolymerization, by cyclic voltammetry, of phenols on Pt-surfaces is a notoriously complex process which depends on the phenols structure, the potential scan rate, the pH, the temperature and the phenols concentration. Comparing the voltammograms from the different monomer compound solutions, it was demonstrated that the polymer film resulting from both OCP and OHP oxidation leads to the higher surface deactivation degree.
Electropolymerization by E. Schab-Balcerzak