An electrochemical impedance and spectroelectrochemical study of the polypyrrole-flavin composite electrode

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Electrodes modified with polypyrrole-flavin mononucleotide composite film (PPy-FMN) have been studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and UV-visible spectro-electrochemistry with optically transparent electrodes (OTE). Flavin molecules, electrostatically trap...

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Detalles Bibliográficos
Autor principal: Bonazzola, C.
Otros Autores: Calvo, E.J
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: Elsevier 1998
Acceso en línea:Registro en Scopus
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100 1 |a Bonazzola, C. 
245 1 3 |a An electrochemical impedance and spectroelectrochemical study of the polypyrrole-flavin composite electrode 
260 |b Elsevier  |c 1998 
270 1 0 |m Calvo, E.J.; Depto. Quim. Inorg., Analitica Quim., Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellon 2, AR-1428 Buenos Aires, Argentina; email: calvo@nahuel.q1.fcen.uba.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a Electrodes modified with polypyrrole-flavin mononucleotide composite film (PPy-FMN) have been studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and UV-visible spectro-electrochemistry with optically transparent electrodes (OTE). Flavin molecules, electrostatically trapped in the composite film, act as dopant anions and can be reduced chemically by reduced PPy0 or electrochemically with a conducting PPy backbone connecting them to the underlying electrode. Both the electrochemistry and the electronic spectra of FMN entrapped in the PPy film markedly differ from those of FMN in aqueous solutions. These differences arise from the interactions of flavin molecules in a rigid matrix and the possibility of both chemical reduction of FMN by reduced PPy0 and flavin electro-reduction in the host polymer matrix. © 1998 Elsevier Science S.A. All rights reserved.  |l eng 
536 |a Detalles de la financiación: Universidad de Buenos Aires, UBACyT Ex-049 
536 |a Detalles de la financiación: The authors wish to give thanks for financial support from the University of Buenos Aires (UBACyT Ex-049) and to Mr. Ariel Weiss for help with programming. Appendix A Here we show that the parabolic second-order differential Eq. (11) with a source/sink term ( k f c ), can be reduced to a pure diffusion differential equation by defining a corrected concentration due to the linear kinetics as: (A1) (x,t)=c(x,t) c ̃ e −k f and therefore Eq. (11) becomes (A2) ∂ c ̃ ∂t =D ∂ 2 c ̃ ∂x 2 which, after linearization in terms of the modulated concentration, (A3) (ω)= c ̃ Δ c ̃ e ( j ω− k f )t yields Eq. (12) , identical to Eq. (22) in Ref. [24] (A4) = j ω′ D Δ c ̃ ∂ 2 Δ c ̃ ∂x 2 with s ′=(j ω ′/ D ) 1/2 . Note, however, that in Eq. (A4) there is a shift of frequency in the complex plane due to the kinetic correction of the concentration variable and ω ′= ω −j k f with | ω ′|=( ω 2 + k f 2 ) 1/2 . From Eq. (29) of Inzelt et al. [24] with C A =0 and R A =0: (A5) Z Q =σω −1/2 (1− j ) k f (1− coth 2 (s′L)) Ds′+k f coth (s′L) and (A6) Z D =σω −1/2 (1− j ) coth (s′L) Thus the total Faradaic impedance results: (A7) Z F =R ct +Z D +Z Q 
593 |a Depto. Quim. Inorg., Analitica Quim., Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellon 2, AR-1428 Buenos Aires, Argentina 
690 1 0 |a CYCLIC VOLTAMMETRY 
690 1 0 |a DOPANT ANIONS 
690 1 0 |a ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY 
690 1 0 |a OPTICALLY TRANSPARENT ELECTRODES 
690 1 0 |a POLYPYRROLE-FLAVIN MONONUCLEOTIDE COMPOSITE FILM 
690 1 0 |a UV-VISIBLE SPECTRO-ELECTROCHEMISTRY 
690 1 0 |a AROMATIC POLYMERS 
690 1 0 |a CHEMICAL MODIFICATION 
690 1 0 |a CYCLIC VOLTAMMETRY 
690 1 0 |a ELECTROSTATICS 
690 1 0 |a MOLECULAR STRUCTURE 
690 1 0 |a NITROGEN COMPOUNDS 
690 1 0 |a SOLUTIONS 
690 1 0 |a SPECTROSCOPY 
690 1 0 |a FLAVIN 
690 1 0 |a OPTICALLY TRANSPARENT ELECTRODES 
690 1 0 |a POLYPYRROLE 
690 1 0 |a ELECTROCHEMICAL ELECTRODES 
700 1 |a Calvo, E.J. 
773 0 |d Elsevier, 1998  |g v. 449  |h pp. 111-119  |k n. 1-2  |p J Electroanal Chem  |x 15726657  |t Journal of Electroanalytical Chemistry 
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