Anion exchange influence on the electrochemomechanical properties of polyaniline

The anion influence on the volume changes of polyaniline (PANI) thick films (∼200 μm) during redox switching was studied using voltammetric experiments with simultaneous microscopical observation. The area occupied by the polymer film in the microscope images was measured and used to compute the fil...

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Autores principales: Lizarraga, L., Andrade, E.M., Molina, F.V.
Formato: JOUR
Materias:
Conducting polymer
Cyclic voltammetry
FTIR spectroscopy
Polymer/anion interactions
Swelling
Volume changes
Electrochemical properties
Electrolytes
Fourier transform infrared spectroscopy
Microscope images
Conducting polymers
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00134686_v53_n2_p538_Lizarraga
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00134686_v53_n2_p538_Lizarraga2023-10-03T14:11:01Z Anion exchange influence on the electrochemomechanical properties of polyaniline Lizarraga, L. Andrade, E.M. Molina, F.V. Conducting polymer Cyclic voltammetry FTIR spectroscopy Polymer/anion interactions Swelling Volume changes Cyclic voltammetry Electrochemical properties Electrolytes Fourier transform infrared spectroscopy Swelling Microscope images Polymer/anion interactions Volume changes Conducting polymers The anion influence on the volume changes of polyaniline (PANI) thick films (∼200 μm) during redox switching was studied using voltammetric experiments with simultaneous microscopical observation. The area occupied by the polymer film in the microscope images was measured and used to compute the film volume and its variations. It is found that the electrolyte anion has a definite influence on the film volume changes. When a film equilibrated with perchloric acid is transferred to sulphuric acid, fully reduced and relaxed and afterwards subject to voltammetric cycling, a net volume increase is observed, spanning several potential cycles until a stationary profile is reached. This change is not reversed when the film is transferred back to perchloric medium, and in this electrolyte the response shows a faster evolution. Exchanges with hydrochloric acid show behaviour more similar to HClO4. IR measurements show that anion exchange is complete before the voltammetric cycling is started, indicating that anion ingress/exchange alone is not the only cause for PANI volume changes. The results are interpreted in terms of polymer backbone conformational changes and polymer/anion interactions. © 2007 Elsevier Ltd. All rights reserved. Fil:Lizarraga, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Andrade, E.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Molina, F.V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00134686_v53_n2_p538_Lizarraga
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Conducting polymer
Cyclic voltammetry
FTIR spectroscopy
Polymer/anion interactions
Swelling
Volume changes
Cyclic voltammetry
Electrochemical properties
Electrolytes
Fourier transform infrared spectroscopy
Swelling
Microscope images
Polymer/anion interactions
Volume changes
Conducting polymers
spellingShingle Conducting polymer
Cyclic voltammetry
FTIR spectroscopy
Polymer/anion interactions
Swelling
Volume changes
Cyclic voltammetry
Electrochemical properties
Electrolytes
Fourier transform infrared spectroscopy
Swelling
Microscope images
Polymer/anion interactions
Volume changes
Conducting polymers
Lizarraga, L.
Andrade, E.M.
Molina, F.V.
Anion exchange influence on the electrochemomechanical properties of polyaniline
topic_facet Conducting polymer
Cyclic voltammetry
FTIR spectroscopy
Polymer/anion interactions
Swelling
Volume changes
Cyclic voltammetry
Electrochemical properties
Electrolytes
Fourier transform infrared spectroscopy
Swelling
Microscope images
Polymer/anion interactions
Volume changes
Conducting polymers
description The anion influence on the volume changes of polyaniline (PANI) thick films (∼200 μm) during redox switching was studied using voltammetric experiments with simultaneous microscopical observation. The area occupied by the polymer film in the microscope images was measured and used to compute the film volume and its variations. It is found that the electrolyte anion has a definite influence on the film volume changes. When a film equilibrated with perchloric acid is transferred to sulphuric acid, fully reduced and relaxed and afterwards subject to voltammetric cycling, a net volume increase is observed, spanning several potential cycles until a stationary profile is reached. This change is not reversed when the film is transferred back to perchloric medium, and in this electrolyte the response shows a faster evolution. Exchanges with hydrochloric acid show behaviour more similar to HClO4. IR measurements show that anion exchange is complete before the voltammetric cycling is started, indicating that anion ingress/exchange alone is not the only cause for PANI volume changes. The results are interpreted in terms of polymer backbone conformational changes and polymer/anion interactions. © 2007 Elsevier Ltd. All rights reserved.
format JOUR
author Lizarraga, L.
Andrade, E.M.
Molina, F.V.
author_facet Lizarraga, L.
Andrade, E.M.
Molina, F.V.
author_sort Lizarraga, L.
title Anion exchange influence on the electrochemomechanical properties of polyaniline
title_short Anion exchange influence on the electrochemomechanical properties of polyaniline
title_full Anion exchange influence on the electrochemomechanical properties of polyaniline
title_fullStr Anion exchange influence on the electrochemomechanical properties of polyaniline
title_full_unstemmed Anion exchange influence on the electrochemomechanical properties of polyaniline
title_sort anion exchange influence on the electrochemomechanical properties of polyaniline
url http://hdl.handle.net/20.500.12110/paper_00134686_v53_n2_p538_Lizarraga
work_keys_str_mv AT lizarragal anionexchangeinfluenceontheelectrochemomechanicalpropertiesofpolyaniline
AT andradeem anionexchangeinfluenceontheelectrochemomechanicalpropertiesofpolyaniline
AT molinafv anionexchangeinfluenceontheelectrochemomechanicalpropertiesofpolyaniline
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