Study of Kinetic Formation and the Electrochemical Behavior of Polypyrrole Films

Abstract

Polypyrrole films have been electrochemically polymerized on platinum electrode under different conditions. The effect of the parameters used during the potentiostatic polymerization, such as monomer concentration, type of doping agent (i.e. counterion), deposition time (i.e. films thickness), concentration of doping agent and polymerization potential on the rate of growth and the electrochemical properties of the polymeric film has been studied. In addition, the effect of the sweep rate of polypyrrole films polymerized with several doping agents were investigated. The results show that the kinetic of formation, the shape, the peak intensity, the peak potential and the electrochemical stability of the electroactive polypyrrole film are reliant on the conditions used during the polymerization process. The empirical kinetics determined from the polymerization charge were found to depend on [Py] 0.85 and [SO 4 2-] 0.5 . The kinetic of the electrochemical response was also affected by the anion use as doping agent during the electrochemical synthesis.

Electrochemical behavior of polypyrrol/AuNP composites deposited by different electrochemical methods: sensing properties towards catechol

“…Curves show the characteristic stepped shape of the potentiostatic polymerization: After a short induction period where diffusion controls the monomer oxidation, the current increased rapidly with time, where polymer started nucleating and growing on the electrode surface. Finally, the current reached a plateau coinciding with a continuous and gradual polymer growth [ 29 – 30 ]. The calculated charges are shown in Table 1 .…”

An Asymmetric Electrochemical System with Complementary Tunability in Hydrophobicity for Selective Separations of Organics

“…29 The latter happens because the AOT doping anions are largely immobilized within the polymer during the oxidative polymerization due to their size and, hence, rely on cation (potassium in this case) exchange with the solution to maintain the electroneutrality of the PPy film during electrochemical modulation. 30…”

“…29 The latter happens because the AOT doping anions are largely immobilized within the polymer during the oxidative polymerization due to their size and, hence, rely on cation (potassium in this case) exchange with the solution to maintain the electroneutrality of the PPy film during electrochemical modulation. 30 The two adsorbent materials exhibited differences in hydrophobicity depending on the electrochemical signals. For PVF−PPy, when the applied potential (E) is lower than the formal potential of ferrocene (E 0 = 0.34 V versus Ag/ AgCl), the PVF−PPy adsorbent is hydrophobic; most ferrocene moieties are reduced, and organics can be taken up by reduced PVF−PPy.…”

Conducting polypyrrole films as a potential tool for electrochemical treatment of azo dyes in textile wastewaters

“…The polypyrrole-pTS − film has long been known to exhibit conductivity as high as 160 S cm −1 [31]. Many studies have shown that this entrapment process is electrochemically reversible [30,32], enabling polypyrrole to act as an anion exchanger, depending upon the mobility of the entrapped counter anion [33]. Clearly, mobile anions can also be easily liberated from the polymeric film, as shown in Fig.…”