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, Leonardo, Andrade, Estela María, Molina, Fernando Victor
Publicado:	2007
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:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v53_n2_p538_Lizarraga http://hdl.handle.net/20.500.12110/paper_00134686_v53_n2_p538_Lizarraga
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00134686_v53_n2_p538_Lizarraga
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spelling	paper:paper_00134686_v53_n2_p538_Lizarraga2023-06-08T14:35:57Z Anion exchange influence on the electrochemomechanical properties of polyaniline Lizarraga, Leonardo Andrade, Estela María Molina, Fernando Victor 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. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v53_n2_p538_Lizarraga 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, Leonardo Andrade, Estela María Molina, Fernando Victor 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.
author	Lizarraga, Leonardo Andrade, Estela María Molina, Fernando Victor
author_facet	Lizarraga, Leonardo Andrade, Estela María Molina, Fernando Victor
author_sort	Lizarraga, Leonardo
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
publishDate	2007
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v53_n2_p538_Lizarraga http://hdl.handle.net/20.500.12110/paper_00134686_v53_n2_p538_Lizarraga
work_keys_str_mv	AT lizarragaleonardo anionexchangeinfluenceontheelectrochemomechanicalpropertiesofpolyaniline AT andradeestelamaria anionexchangeinfluenceontheelectrochemomechanicalpropertiesofpolyaniline AT molinafernandovictor anionexchangeinfluenceontheelectrochemomechanicalpropertiesofpolyaniline
_version_	1768545401457082368

Anion exchange influence on the electrochemomechanical properties of polyaniline

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