<b>Electrochemical properties and electrochemical impedance spectroscopy of polypyrrole-coated platinum electrodes</b>
Polypyrrole (PPy) films of different thickness were characterized by electrochemical impedance spectroscopy (EIS) measurements in acetonitrile and aqueous solutions, containing 0.1 M NaClO<sub>4</sub> or sodium dodecylsulfate as the dopant. The PPy films were electrochemically deposited...
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| Format: | Article |
| Language: | English |
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Chemical Society of Ethiopia
2006-12-01
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| Series: | Bulletin of the Chemical Society of Ethiopia |
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| Online Access: | http://www.ajol.info/index.php/bcse/article/view/21171 |
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| author | M. Fall A.A. Diagne M. Guène C. Della Volpe P.L. Bonora F. Deflorian S. Rossi |
| author_facet | M. Fall A.A. Diagne M. Guène C. Della Volpe P.L. Bonora F. Deflorian S. Rossi |
| author_sort | M. Fall |
| collection | DOAJ |
| description | Polypyrrole (PPy) films of different thickness were characterized by electrochemical impedance spectroscopy (EIS) measurements in acetonitrile and aqueous solutions, containing 0.1 M NaClO<sub>4</sub> or sodium dodecylsulfate as the dopant. The PPy films were electrochemically deposited on Pt, and their electrochemical properties studied by cyclic voltammetry. Impedance spectra were obtained at potentials ranging from 0 to 0.8 V/SCE. The EIS data were fitted using two different equivalent electrical circuits (depending on the nature of the dopant). They involve a diffusive capacitance, which increased with the passing charge during electrosynthesis (i.e. film thickness) for ClO<sub>4</sub><sup>-</sup>-doped PPy, but was practically unaffected by the film thickness in the case of SDS-doped PPy. Also, a double-layer capacitance was found only in the circuit of ClO<sub>4</sub><sup>-</sup>-doped PPy. It increased with the film thickness, and showed a minimum near the open-circuit potential. Finally the charge-transfer resistance (R<sub>ct</sub>) obtained with SDS is nearly 200-fold higher than that obtained with ClO<sub>4</sub><sup>-</sup> in the same solvent (H<sub>2</sub>O). With the same dopant (ClO<sub>4</sub><sup>-</sup>), R<sub>ct</sub> is about five times higher in acetonitrile relative to water. All these EIS results of the different types of PPy suggest a relation with the wettability of the polymer. |
| first_indexed | 2024-12-12T04:26:14Z |
| format | Article |
| id | doaj.art-d5e8d59046724b6a99d6d0c73a8b07ac |
| institution | Directory Open Access Journal |
| issn | 1011-3924 1726-801X |
| language | English |
| last_indexed | 2024-12-12T04:26:14Z |
| publishDate | 2006-12-01 |
| publisher | Chemical Society of Ethiopia |
| record_format | Article |
| series | Bulletin of the Chemical Society of Ethiopia |
| spelling | doaj.art-d5e8d59046724b6a99d6d0c73a8b07ac2022-12-22T00:38:12ZengChemical Society of EthiopiaBulletin of the Chemical Society of Ethiopia1011-39241726-801X2006-12-01202279293<b>Electrochemical properties and electrochemical impedance spectroscopy of polypyrrole-coated platinum electrodes</b>M. FallA.A. DiagneM. GuèneC. Della VolpeP.L. BonoraF. DeflorianS. RossiPolypyrrole (PPy) films of different thickness were characterized by electrochemical impedance spectroscopy (EIS) measurements in acetonitrile and aqueous solutions, containing 0.1 M NaClO<sub>4</sub> or sodium dodecylsulfate as the dopant. The PPy films were electrochemically deposited on Pt, and their electrochemical properties studied by cyclic voltammetry. Impedance spectra were obtained at potentials ranging from 0 to 0.8 V/SCE. The EIS data were fitted using two different equivalent electrical circuits (depending on the nature of the dopant). They involve a diffusive capacitance, which increased with the passing charge during electrosynthesis (i.e. film thickness) for ClO<sub>4</sub><sup>-</sup>-doped PPy, but was practically unaffected by the film thickness in the case of SDS-doped PPy. Also, a double-layer capacitance was found only in the circuit of ClO<sub>4</sub><sup>-</sup>-doped PPy. It increased with the film thickness, and showed a minimum near the open-circuit potential. Finally the charge-transfer resistance (R<sub>ct</sub>) obtained with SDS is nearly 200-fold higher than that obtained with ClO<sub>4</sub><sup>-</sup> in the same solvent (H<sub>2</sub>O). With the same dopant (ClO<sub>4</sub><sup>-</sup>), R<sub>ct</sub> is about five times higher in acetonitrile relative to water. All these EIS results of the different types of PPy suggest a relation with the wettability of the polymer.http://www.ajol.info/index.php/bcse/article/view/21171Conducting polymersPolypyrroleElectrochemical impedance spectroscopyEquivalent-electrical circuitMicellar media |
| spellingShingle | M. Fall A.A. Diagne M. Guène C. Della Volpe P.L. Bonora F. Deflorian S. Rossi <b>Electrochemical properties and electrochemical impedance spectroscopy of polypyrrole-coated platinum electrodes</b> Bulletin of the Chemical Society of Ethiopia Conducting polymers Polypyrrole Electrochemical impedance spectroscopy Equivalent-electrical circuit Micellar media |
| title | <b>Electrochemical properties and electrochemical impedance spectroscopy of polypyrrole-coated platinum electrodes</b> |
| title_full | <b>Electrochemical properties and electrochemical impedance spectroscopy of polypyrrole-coated platinum electrodes</b> |
| title_fullStr | <b>Electrochemical properties and electrochemical impedance spectroscopy of polypyrrole-coated platinum electrodes</b> |
| title_full_unstemmed | <b>Electrochemical properties and electrochemical impedance spectroscopy of polypyrrole-coated platinum electrodes</b> |
| title_short | <b>Electrochemical properties and electrochemical impedance spectroscopy of polypyrrole-coated platinum electrodes</b> |
| title_sort | b electrochemical properties and electrochemical impedance spectroscopy of polypyrrole coated platinum electrodes b |
| topic | Conducting polymers Polypyrrole Electrochemical impedance spectroscopy Equivalent-electrical circuit Micellar media |
| url | http://www.ajol.info/index.php/bcse/article/view/21171 |
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