The Impedance of Poly(aniline) Electrode Films

Glarum, S. H.; Marshall, J. H.

doi:10.1149/1.2100395

Cited by 182 publications

(71 citation statements)

References 12 publications

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“…In Ref. [58] the variation of conductance and capacitance with applied potential was monitored, showing the larger values expected in the conducting zone from Â/0.2 to 0.8 V versus SCE and a direct correlation between the variation of the two parameters, also demonstrated in Ref. [59].…”

Section: Impedancementioning

confidence: 66%

Conducting polymers from aminobenzoic acids and aminobenzenesulphonic acids: influence of pH on electrochemical behaviour

Brett

Thiemann

2002

Journal of Electroanalytical Chemistry

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The influence of pH on the electrochemical behaviour of conducting polymer films electrosynthesised from aminobenzoic acids and aminobenzenesulphonic acids was investigated by voltammetric and electrochemical impedance studies in sulphuric acid solution, acetate buffer and neutral phosphate buffer. The change in electrochemical behaviour with increasing pH is significantly less for poly(aminobenzenesulphonic acid)s and poly(aminobenzoic acid)s than for polyaniline. Polymer films made by electrosynthesis of mixtures of these monomers with aniline have also been analysed by the same techniques. Experimental results obtained over this pH range are interpreted in the light of previous studies carried out on these polymers in strong acid solution. #

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Section: Impedancementioning

confidence: 66%

Conducting polymers from aminobenzoic acids and aminobenzenesulphonic acids: influence of pH on electrochemical behaviour

Brett

Thiemann

2002

Journal of Electroanalytical Chemistry

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“…Measurement uncertainties and poor reproducibility of electrodeposited films are major drawbacks of these methods. In situ AC impedance spectroscopy 31 allows extraction of the electrical resistance of a complex system that includes other resistance components, such as contact resistances and ionic resistances in the polymer and electrolyte. The simplicity of the approach makes it possible to precisely determine the conductivity of bulk polymer films with a defined geometry.…”

Section: In Situ Conductivity Of P3bt Filmsmentioning

confidence: 99%

Characterization of an electroactive polymer for overcharge protection in secondary lithium batteries

Chen

Thomas‐Alyea

Newman

et al. 2005

Electrochimica Acta

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The optical, electronic, and electrochemical properties of thin films of the electroactive polymer, poly(3-butylthiophene) (P3BT), were studied in a lithium hexafluorophosphate electrolyte. Upon extraction of n electrons per polymer formula unit, anions are taken up to balance the charge, forming a polymer cation salt, (P3BT) mn+ (PF 6 -) mn (m is the number of formula units in the polymer chain), whose state of charge (SOC) varies with n. An in situ AC impedance method was developed to determine the electronic conductivity of the polymer at different states of charge. On oxidation of the insulating neutral P3BT polymer, the conductivity increased by eight orders of magnitude. The electrochemical potential, electronic conductivity, and optical spectrum at each state of charge were correlated, producing a color index of these primary characteristics. This allowed determination of the potential and state of charge as a function of location in transparent polymer films during propagation of an oxidation front across the film and during passage of steady-state currents through the polymer film.

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“…However, investigations of conducting polymers at the cathodic side of the potential scale are rare. Polyaniline (PAn) was studied most intensively by EIS [11][12][13][14][15][16][17][18][19][20] to complement and elucidate current-voltage and mass transport characteristics at the positive side of the potential scale.…”

Section: Introductionmentioning

confidence: 99%

Investigation of N2-fixation on polyaniline electrodes in methanol by electrochemical impedance spectroscopy

et al. 2010

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The ac response of polyaniline thin films on platinum electrodes was measured at different dc potentials during the N 2 -fixation in methanol ? LiClO 4 electrolyte with 0.03 mol L -1 H 2 SO 4 for the first time. The optimum film thickness was found to be 1.5 lm, N 2 -pressure 50 bar and an optimum electrolysis potential of -0.12 V (NHE). The diffusion coefficients for N 2 into the polymer film was found to be (5 ± 2)910 -9 cm 2 s -1 .

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The Impedance of Poly(aniline) Electrode Films

Cited by 182 publications

References 12 publications

Conducting polymers from aminobenzoic acids and aminobenzenesulphonic acids: influence of pH on electrochemical behaviour

Conducting polymers from aminobenzoic acids and aminobenzenesulphonic acids: influence of pH on electrochemical behaviour

Characterization of an electroactive polymer for overcharge protection in secondary lithium batteries

Investigation of N2-fixation on polyaniline electrodes in methanol by electrochemical impedance spectroscopy

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