On the pH dependence of electroactivity of poly(methylene blue) films
Identifieur interne : 003C12 ( Main/Repository ); précédent : 003C11; suivant : 003C13On the pH dependence of electroactivity of poly(methylene blue) films
Auteurs : RBID : Pascal:10-0322778Descripteurs français
- Pascal (Inist)
- Effet milieu, pH, Electrocatalyse, Activité catalytique, Bleu méthylène, Microbalance quartz, Spectroélectrochimie, Polymérisation électrolytique, Spectrométrie UV visible, Electrode ITO, Polymère électroactif, Solution tampon, Phosphate, Réaction électrochimique, Bleu méthylène polymère, Phénothiazine dérivé polymère.
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- concept : Phosphate.
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Abstract
The electrochemical behavior of poly(methylene blue) on different electrodes has been investigated by electrochemical quartz crystal microbalance and in situ spectrophotometric measurements coupled to cyclic voltammetry. Polymeric films were obtained potentiodynamically and the charge transport mechanism was analyzed. The electrochemical results show that polymer electroactivity depends not only on pH but also on the substrate. Charge compensation changes with both pH and the size of the anions showing a transition in the pH range of polymer pKa. It was demonstrated by spectroelectrochemical experiments that the electroactivity of the film depends on the radical/radical cation equilibrium. The potentials where the most electroactive species are formed have been determined.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">On the pH dependence of electroactivity of poly(methylene blue) films</title><author><name sortKey="Pfaffen, V" uniqKey="Pfaffen V">V. Pfaffen</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>INFIQC, Departamento de Fisicoquimica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria</s1><s2>5000 Córdoba</s2><s3>ARG</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Argentine</country><wicri:noRegion>5000 Córdoba</wicri:noRegion></affiliation></author><author><name sortKey="Ortiz, P I" uniqKey="Ortiz P">P. I. Ortiz</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>INFIQC, Departamento de Fisicoquimica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria</s1><s2>5000 Córdoba</s2><s3>ARG</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Argentine</country><wicri:noRegion>5000 Córdoba</wicri:noRegion></affiliation></author><author><name sortKey="Cordoba De Torresi, S I" uniqKey="Cordoba De Torresi S">S. I. Cordoba De Torresi</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Instituto de Química, Universidade de São Paulo, CP. 26077</s1><s2>05513-970 São Paulo (SP)</s2><s3>BRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Brésil</country><wicri:noRegion>05513-970 São Paulo (SP)</wicri:noRegion></affiliation></author><author><name sortKey="Torresi, R M" uniqKey="Torresi R">R. M. Torresi</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Instituto de Química, Universidade de São Paulo, CP. 26077</s1><s2>05513-970 São Paulo (SP)</s2><s3>BRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Brésil</country><wicri:noRegion>05513-970 São Paulo (SP)</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="inist">10-0322778</idno><date when="2010">2010</date><idno type="stanalyst">PASCAL 10-0322778 INIST</idno><idno type="RBID">Pascal:10-0322778</idno><idno type="wicri:Area/Main/Corpus">004244</idno><idno type="wicri:Area/Main/Repository">003C12</idno></publicationStmt><seriesStmt><idno type="ISSN">0013-4686</idno><title level="j" type="abbreviated">Electrochim. acta</title><title level="j" type="main">Electrochimica acta</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Buffer solution</term><term>Catalyst activity</term><term>Electroactive polymer</term><term>Electrocatalysis</term><term>Electrochemical polymerization</term><term>Electrochemical reaction</term><term>Indium tin oxide electrode</term><term>Medium effect</term><term>Methylene blue</term><term>Phosphates</term><term>Quartz microbalance</term><term>Spectroelectrochemistry</term><term>Ultraviolet visible spectrometry</term><term>pH</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Effet milieu</term><term>pH</term><term>Electrocatalyse</term><term>Activité catalytique</term><term>Bleu méthylène</term><term>Microbalance quartz</term><term>Spectroélectrochimie</term><term>Polymérisation électrolytique</term><term>Spectrométrie UV visible</term><term>Electrode ITO</term><term>Polymère électroactif</term><term>Solution tampon</term><term>Phosphate</term><term>Réaction électrochimique</term><term>Bleu méthylène polymère</term><term>Phénothiazine dérivé polymère</term></keywords><keywords scheme="Wicri" type="concept" xml:lang="fr"><term>Phosphate</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The electrochemical behavior of poly(methylene blue) on different electrodes has been investigated by electrochemical quartz crystal microbalance and in situ spectrophotometric measurements coupled to cyclic voltammetry. Polymeric films were obtained potentiodynamically and the charge transport mechanism was analyzed. The electrochemical results show that polymer electroactivity depends not only on pH but also on the substrate. Charge compensation changes with both pH and the size of the anions showing a transition in the pH range of polymer pKa. It was demonstrated by spectroelectrochemical experiments that the electroactivity of the film depends on the radical/radical cation equilibrium. The potentials where the most electroactive species are formed have been determined.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0013-4686</s0></fA01><fA02 i1="01"><s0>ELCAAV</s0></fA02><fA03 i2="1"><s0>Electrochim. acta</s0></fA03><fA05><s2>55</s2></fA05><fA06><s2>5</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>On the pH dependence of electroactivity of poly(methylene blue) films</s1></fA08><fA11 i1="01" i2="1"><s1>PFAFFEN (V.)</s1></fA11><fA11 i1="02" i2="1"><s1>ORTIZ (P. 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