Effect of the temperature on the conductivity and capacitance of poly(aniline) film electrodes

Inzelt, György; Ланг, Г.; Kertész, Vilmos; Bácskai, J.

doi:10.1016/0013-4686(93)80145-p

Cited by 48 publications

(22 citation statements)

References 36 publications

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“…3). This is in good accordance with the earlier impedance measurements for PANI [23][24][25][26][27][28]. Some impedance spectra of PANI show a high-frequency semicircle [29,30].…”

Section: Impedance Spectra Of Gc/panisupporting

confidence: 82%

Impedance study of thiolated polyaniline

Blomquist

Bobacka

Ivaska

et al. 2012

J Solid State Electrochem

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Covalent attachment of thiolated probes to conducting polymers such as polyaniline (PANI) is a promising approach towards the development of electrochemical sensors and biosensors. However, thiolation alters the conjugated polymer backbone and influences the electrochemical behavior of the conducting polymer. PANI studied in this work was electropolymerized on glassy carbon (GC) electrodes from a solution of 0.1 M aniline in 0.5 or 1.0 M H 2 SO 4 . The GC/PANI electrodes were then functionalized by covalent attachment of 2-mercaptoethanol to the PANI backbone. The progress of thiolation was studied by cyclic voltammetry and electrochemical impedance spectroscopy (EIS). Thiolation of PANI was found to cause an initial decrease in electroactivity at 0-0.25 V and an increase in electroactivity at 0.25-0.6 V. However, prolonged thiolation caused a loss of electroactivity of PANI, which could be seen from EIS measurements as a dramatic decrease in the bulk redox capacitance of PANI.

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“…3). This is in good accordance with the earlier impedance measurements for PANI [23][24][25][26][27][28]. Some impedance spectra of PANI show a high-frequency semicircle [29,30].…”

Section: Impedance Spectra Of Gc/panisupporting

confidence: 82%

Impedance study of thiolated polyaniline

Blomquist

Bobacka

Ivaska

et al. 2012

J Solid State Electrochem

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“…This is consistent with previous reports of the loss of film capacitance in low-voltage-amplitude (ac impedance) experiments vs. that expected from the CVs. 10,11,17,23,24,33,36,40 The origin of this apparent capacitance loss has been explored by us in another paper. 18 To further validate the assignment and the magnitude of the circuit element CPE 3 , the film capacitance was also extracted from the linear slope of the raw Z im data vs. 1/frequency (f ) plot (Fig.…”

Section: Type I Pani Films Deposited On Au Electrodesmentioning

confidence: 98%

The Effect of Film Thickness and Growth Method on Polyaniline Film Properties

Dinh

Vanýsek

Birss

1999

J. Electrochem. Soc.

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There has been significant interest in the electrochemical properties of polyaniline (PANI) films on electrode surfaces, largely because of the many promising applications of PANI in electrochromic devices, 1,2 as supercapacitive materials, as intercalating electrodes in advanced batteries, 3,4 for electrocatalysis of certain reactions, [5][6][7] in microelectronic devices, 8 etc.The properties of PANI films have been extensively studied by many different methods. However, despite the numerous past studies of PANI films, there are still many remaining questions regarding their electrochemical growth mechanism, their structure (particularly at the nanometer scale), and even their electrical properties. Although the impedance technique has been employed quite frequently as a tool for investigating PANI film properties, 9-17 many of these past studies have focused on the characterization of a single film at different potentials, or of several films of different thickness, but grown by one technique. No single study has been directed at comparing the electrochemical properties of PANI films formed at different rates to different thicknesses at different substrates, etc. As a consequence, there is some uncertainty regarding the dependence of film properties on experimental variables. In fact, many past studies have focused more on the description of the impedance data without much emphasis on interpretation.Therefore, one of the key objectives of this work was to examine the PANI film impedance response over a wide range of potentials for films formed to various thicknesses while employing several different electrochemical growth conditions on Au and Pt substrates. The principal goal of these studies has been to obtain a better understanding of the growth and structural properties of these films from a careful variation of the experimental parameters within a single controlled study.In this paper, the electrochemical properties of PANI films, grown by two different methods (type I and type II films) to various thicknesses and studied by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), are examined systematically. The structural and interfacial properties of the two types of films are compared, for the first time, by tracking the rate of the hydrogen evolution reaction (HER) with time of PANI film growth. It is shown that type II films are more porous, both in the bulk of the film and at the base of film pores, and are more capacitive than type I films. Type II films also undergo structural changes during film growth, while type I films remain relatively uniform. This work is considered important in terms of providing knowledge regarding how the growth parameters affect PANI film properties and also insight into how to design PANI films with the desired structure, porosity, capacitance, and stability characteristics. ExperimentalCells and electrodes.-The details of the solutions and the instrumentation used for carrying out CV and ac impedance measurements have been described elsewhere. 18 Sta...

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“…The deviations of the impedance responses [24,54,60,72,74,76,82,89,101,102,106,110,119,128,139,140,161,172,178] from those predicted by the theories have been explained by taking into account different effects such as interactions between redox sites [85,119], ionic relaxation processes [167], distribution of diffusion coefficients [161], migration [26,37,107,130,131,178], film swelling [108,168,190], slow reaction with solution species [38,108], nonuniform film thickness [106], inhomogeneous oxidation/reduction processes [76], experimental artifacts [82], and so on.…”

Section: Impedance Spectra Of Polymer Filmsmentioning

confidence: 99%