Electrochemical characterization of chemically synthesized polyanilines

Mermilliod, N.; Tanguy, J.; Hoclet, M.; Syed, Akheel Ahmed

doi:10.1016/0379-6779(87)90905-2

Cited by 39 publications

(10 citation statements)

References 5 publications

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“…To extract this value, a representation of the imaginary part of the impedance as a function of the inverse of angular frequency is plotted, and C LF is calculated from the slope. This value is related to the charge compensation process in the external part of the film, that is, to the ions with shorter relaxation times, as described previously by Tanguy et al 20 and Mermilliod et al 21 Figure 9 shows the C LF values for Li ϩ and TBA ϩ in PC and ACN solutions. For Li ϩ , the curves observed in PC and ACN are similar to the voltammograms shown in Fig.…”

Section: Resultssupporting

confidence: 54%

Ionic Exchange Phenomena Related to the Redox Processes of Polyaniline in Nonaqueous Media

Varela

Torresi

2000

J. Electrochem. Soc.

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Section: Resultssupporting

confidence: 54%

Ionic Exchange Phenomena Related to the Redox Processes of Polyaniline in Nonaqueous Media

Varela

Torresi

2000

J. Electrochem. Soc.

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“…However, if it is clear that the capacitance is of electrochemical nature and related to the ion's diffusion inside the polymer, some questions remain unsolved; does the charging of capacitance give rise to a new form of doping of the polypyrrole, or are the ions involved in the redox reaction also contributing to the capacitance? Considering that the capacitance effect has been observed in other materials, such as polythiophene (22) and polyaniline (23), the answer to these questions would constitute an important step in the understanding of the doping mechanism in conducting polymer.…”

Section: Discussionmentioning

confidence: 99%

A Study of Chemically Synthesized Polypyrrole as Electrode Material for Battery Applications

Mermilliod

Tanguy

Petiot

1986

J. Electrochem. Soc.

275

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We have studied the behavior of a chemically synthesized polypyrrole as electrode material. The different electrochemical methods that we have used for this characterization, namely, cyclic voltammetry, ac impedance measurements, and cyclic chronopotentiometry, have evidenced the role of the low frequency capacitance Cnormals characteristic of the doped state of polypyrrole. This capacitance seems independent of the synthesis conditions of the polymer, and we show that it partially explains the large value of the total charge false(Cnormalm>100 normalAh/normalkgfalse) stored in this polypyrrole. Analyzing the effect of residual water in the polymer, we show that a water content of about 3% (w/w) increases the total charge Cnormalm and lowers the redox potential E0 . A quasi linear relationship has been found between E0 and Cnormalm , the massic capacity: Cnormalm increases when E0 decreases. This relation can be also attributed to the charging of the capacitance Cnormals:Qnormalcs=Cnormals false(Enormald−E0false) , where Enormald is the degradation potential. We discuss the origin of this capacitance Cnormals .

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Section: Discussionmentioning

confidence: 99%

The Corrosion of Carbon Black Anodes in Alkaline Electrolyte: II . Acetylene Black and the Effect of Oxygen Evolution Catalysts on Corrosion

Staud

Ross

1986

J. Electrochem. Soc.

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The effect of five different metal oxides on the corrosion rate of acetylene black during oxygen evolution in alkaline electrolyte was determined using the analytical methods described in Part I. All five metal oxides (FelOn, Cr20~, NiO, C0:~O4, and Ru) catalyzed the corrosion processes of the acetylene black, resulting in corrosion rates accelerated by factors of 3-14. The mechanism of this catalytic effect remains unclear. Some results with C0304 have indicated direct contact with the oxide, and the carbon is not required to accelerate the corrosion, suggesting a redox mechanism involving dissolved species. However, the effects of Fe20:~ and Cr~O~, which were significantly greater than with C0:~O4, are difficult to rationalize on this basis, as their redox potentials lie well below the oxygen evolution potential range.

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Electrochemical characterization of chemically synthesized polyanilines

Cited by 39 publications

References 5 publications

Ionic Exchange Phenomena Related to the Redox Processes of Polyaniline in Nonaqueous Media

Ionic Exchange Phenomena Related to the Redox Processes of Polyaniline in Nonaqueous Media

A Study of Chemically Synthesized Polypyrrole as Electrode Material for Battery Applications

The Corrosion of Carbon Black Anodes in Alkaline Electrolyte: II . Acetylene Black and the Effect of Oxygen Evolution Catalysts on Corrosion

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