Electrochemistry of Conductive Polymers: VI . Degradation Reaction Kinetics of Polyaniline Studied by Rotating Ring‐Disk Electrode Techniques

Stilwell, David E.; Park, Su‐Moon

doi:10.1149/1.2096711

Cited by 103 publications

(32 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is illustrated in Figure 4 The main degradation product, detected by UV-vis and cyclic voltammetry, was benzoquinone, which is in agreement with the literature [19][20][21].…”

Section: Resultssupporting

confidence: 89%

Reaction rate and electrochemical stability of conducting polymer films used for the reduction of hexavalent chromium

Ruotolo

Liao

2004

Journal of Applied Electrochemistry

View full text Add to dashboard Cite

The reduction of toxic hexavalent chromium to its trivalent state at conducting polymers films was studied. The process is based on the capacity of conducting polymers to spontaneously donate electrons to the Cr(VI) species. Electrodes of polyaniline and polypyrrole, deposited as films on reticulated vitreous carbon (RVC), were prepared. The process of Cr(VI) reduction was studied under open and closed circuit conditions. It was observed that polyaniline was only suitable for use only under closed circuit conditions, whereas polypyrrole did not perform well under either open or closed circuit conditions. The electrocatalytic power of polyaniline for Cr(VI) reduction was demonstrated when the reaction rates for bare RVC and RVC/PANI were compared.

show abstract

“…This is illustrated in Figure 4 The main degradation product, detected by UV-vis and cyclic voltammetry, was benzoquinone, which is in agreement with the literature [19][20][21].…”

Section: Resultssupporting

confidence: 89%

Reaction rate and electrochemical stability of conducting polymer films used for the reduction of hexavalent chromium

Ruotolo

Liao

2004

Journal of Applied Electrochemistry

View full text Add to dashboard Cite

show abstract

“…both anodic and cathodic parts of the two characteristic redox transitions diminish in height. Obviously, the only reason for this is the degradation or decomposition of PANI film, leading to low-molecular weight decomposition products [27][28][29]. The degradation products are usually identified as p-quinone/p-hydroquinone and p-quinoneimine/p-aminophenol redox couples [28] and the rate of this degradation depends on the electrode potential applied.…”

Section: Stability Studymentioning

confidence: 99%

Electropolymerization of aniline in acid media on the bare and chemically pre-treated aluminum electrodes

Pournaghi-Azar

Habibi

2007

Electrochimica Acta

View full text Add to dashboard Cite

“…The oxidation peaks a and d could be assigned to the leucoemeraldine/ emeraldine and emeraldine/pernigraniline redox transitions of PANI (eqs 1 and 2), respectively. The middle peaks b and c were associated with the products of the PANI degradation, most probably benzoquinone/ hydroquinone (BQ/HQ) and p-aminophenol/p-quinoneimine (PAP/QI) redox couples (eqs 4-6), [12][13][14][15][16][17] and these eqs 1-6 could be shown as follows: …”

Section: Resultsmentioning

confidence: 99%

Effect of Quaternary Cations on the Electrochemical Synthesis of Polyaniline and Its Degradation

Sun

Zhang

Jiang

et al. 2005

Polym J

View full text Add to dashboard Cite

ABSTRACT:Polyaniline(PANI) was prepared by adding three different quaternary ammonium salts to H 2 SO 4 electrolyte and the effect of the cations on the electrochemical degradation of PANI film was researched. The electropolymerized films were characterized by cyclic voltammetry, UV-vis spectroscopy and scanning electron microscopy. The result showed that quaternary cations hindered gradually the polymerization of aniline with increase of the size, which made the porosity of the film smaller and the morphology more compact compared with pure PANI films. Although the cations didn't change the electrode reactive process of PANI, they affected the oxidation velocity of the films and the degradation rate of PANI in the following order: PANI is considered to be the most promising conducting polymers due to its high electrical conductivity, excellent environmental stability, low-cost and easy preparation.1 The electrochemical stability of PANI and related materials is of great importance for their possible use in various electrochemical systems and devices, such as rechargeable batteries, electrochromic displays and sensors, etc.2-6 Therefore, much attention has been paid to study the stability and degradation of PANI.Up to now, discussing the effect of the nature and size of cations on PANI films is very significant for the preparation of PANI with good properties and extensive applications and many papers about simple inorganic cations have been reported. Min et al.7 synthesized PANI with high molecular weight by the technique of adding inorganic salts. Boroleet et al. ) and found that the conductivity of the films was increased. He et al.9 found that alkaline metal cations obviously accelerated the growth rate of PANI films in the following order:þ by employing ellipsometry and electrochemical methods. Giovani et al.10 also prepared PANI films in aniline solution containing different alkaline metal cations and found that the variation of the scan rate for only the first cycle affected the morphology, and therefore the electrical properties of PANI films grown potentiodynamically. However, only scarce information was available in the effect of quaternary cations on properties of PANI. The present work showed that quaternary cations hindered the degradation of the films, and the trends increased with the augment of the cations.In this paper we discussed the polymerization of aniline in H 2 SO 4 solution containing different quaternary cations (and the effect of cations on the degradation of PANI films in H 2 SO 4 in detail by UV-vis absorption spectra and cyclic voltammetry. EXPERIMENTAL All chemicals (aniline, H 2 SO 4 , Me 4 NBr, Et 4 NBr, Bu 4 NBr) were of AR grade and used without further purification. Doubly distilled water was employed to prepare all solutions. The electrochemical synthesis and characterization of PANI were carried out at room temperature in a standard three-electrode cell. The cell consisted of a platinum (Pt) wire (ca. 5 mm length and 0.5 mm diameter) or glassy carbon (GC) (ca. 3.0 mm diamete...

show abstract

Electrochemistry of Conductive Polymers: VI . Degradation Reaction Kinetics of Polyaniline Studied by Rotating Ring‐Disk Electrode Techniques

Abstract: Subscripts d disk g gap r ring

Cited by 103 publications

References 22 publications

Reaction rate and electrochemical stability of conducting polymer films used for the reduction of hexavalent chromium

Reaction rate and electrochemical stability of conducting polymer films used for the reduction of hexavalent chromium

Electropolymerization of aniline in acid media on the bare and chemically pre-treated aluminum electrodes

Effect of Quaternary Cations on the Electrochemical Synthesis of Polyaniline and Its Degradation

Contact Info

Product

Resources

About