Polypyrrole and poly N-methylpyrrole — An electrochemical study in an aqueous medium

Geniès, E.M.; Syed, Akheel Ahmed

doi:10.1016/0379-6779(84)90076-6

Cited by 74 publications

(33 citation statements)

References 10 publications

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“…The higher activity of the adsorbed FeTSPc at low overpotential, compared with the vast amount of FeTSPc incorporated in polypyrrole, is probably due to the limited conductivity of the polypyrrole layer. Perhaps, also the instability in alkaline media of polypyrrole itself, as reported by some authors [14], plays a role. Since the prewave and the main wave almost coincide in alkaline media, it is not expected that a more detailed study of the oxygen reduction on FeTSPc/polypyrrole films in these media will give more insight into the mechanism of oxygen reduction on FeTSPc.…”

Section: Resultsmentioning

confidence: 80%

The mechanism of oxygen reduction at iron tetrasulfonato-phthalocyanine incorporated in polypyrrole

Elzing

Putten

Visscher

et al. 1987

Journal of Electroanalytical Chemistry and Interfacial Electroc

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Section: Resultsmentioning

confidence: 80%

The mechanism of oxygen reduction at iron tetrasulfonato-phthalocyanine incorporated in polypyrrole

Elzing

Putten

Visscher

et al. 1987

Journal of Electroanalytical Chemistry and Interfacial Electroc

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“…As reported in our previous article [29] for freshly prepared PPy/Cl layers the pH influence on the shape of voltammetric curves was rather small. Only for pH < 1 distinct changes of the shape of the voltammogram were noticed, this may be explained by protonation of the polymer bulk [24][25][26][27][28]. However, the potentiometric and the voltammetric results in a previous article [29] were obtained for the conditioned layers.…”

Section: Resultsmentioning

confidence: 91%

“…One of them concerns the mechanism of pH influence on the polymer electrochemical properties, especially poly(pyrrole). Although this problem has been studied [4,[24][25][26][27][28] the general answer yet has not been given. In our opinion the hydrogen ions may be involved in: ion-exchange equilibria, protonation-deprotonation of the film, redox side reactions between the polymer and redox species present in solution (O 2 , water) [29].…”

Section: Introductionmentioning

confidence: 99%

On the pH Influence on Electrochemical Properties of Poly(pyrrole) and Poly(N-methylpyrrole)

Michalska

Maksymiuk²

1998

Electroanalysis

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The electrochemical behavior of poly(pyrrole) doped with chloride (PPy/Cl) and dodecylsulfate (PPy/DS) ions as well as of poly(N-methylpyrrole) doped with perchlorate anions (PMPy/ClO 4 ) was studied in aqueous electrolyte (KCl) solutions (pH 0.5 to 7). The results indicate that the pH effect is dependent on polymer/dopant system properties, although in general the pH change mostly affects the polymer by the change of solution redox potential. Although the studied polymers exhibit different formal potentials and ion-exchange properties, open circuit potentials of these films were quite similar. The slope of the open circuit potential dependence on pH was the highest for PPy/Cl, but still much below the value expected for the H + exchange process. The high sensitivity of PPy/Cl films for the pH changes was also observed in impedance measurements. Results obtained for the PPy/Cl system indicate that acidification of the solution favors lower charge transfer impedances. The results of voltammetric studies indicate that conditioning of the PPy/Cl layer in neutral solution is accompanied with deprotonation of the polymer film. This effect was less pronounced for the PPy/DS layers probably due to the inhibiting properties of the surface active doping anions, and was not observed for PMPy/ClO 4 films. This suggests that hydrogen atom connected with nitrogen atom is involved in the discussed processes.

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“…However, even after hydroxide treatment, the H/C ratio is still higher than the theoretical ratio of 0.75. Polypyrrole often contains excess H [14,21]. This excess H results from sp9 defects in the polymer chain and at the chain ends [14,21].…”

Section: Resultsmentioning

confidence: 99%

A Simple Chemical Procedure for Extending the Conductive State of Polypyrrole to More Negative Potentials

Dyke

Kuwabata

Martin

1993

J. Electrochem. Soc.

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The electronically conductive polymer polypyrrole is an electronic conductor at potentials positive of ca. −0.4 V vs. the saturated calomel electrode (SCE) and an electronic insulator at potentials negative of this value. As a result of this potential‐dependent conductor/insulator transition, a polypyrrole film can be used as an electrode for redox couples with E0 positive of ca. −0.4 V vs. SCE but cannot be used as an electrode for couples with E0 negative of this value. We have discovered a simple chemical procedure that extends the conductive state of polypyrrole to ca. −1.1 V vs. SCE. This procedure entails treating the polypyrrole film with aqueous sodium hydroxide. We demonstrate this extension of the conductive state to more negative potentials here. We also propose, and test, a chemical model that explains the extension of the conductive state.

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Polypyrrole and poly N-methylpyrrole — An electrochemical study in an aqueous medium

Cited by 74 publications

References 10 publications

The mechanism of oxygen reduction at iron tetrasulfonato-phthalocyanine incorporated in polypyrrole

The mechanism of oxygen reduction at iron tetrasulfonato-phthalocyanine incorporated in polypyrrole

On the pH Influence on Electrochemical Properties of Poly(pyrrole) and Poly(N-methylpyrrole)

A Simple Chemical Procedure for Extending the Conductive State of Polypyrrole to More Negative Potentials

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