Dynamics of regioregular conducting polymer electrodes in response to electrochemical stimuli

Hillman, A. Robert; Efimov, Igor; Skompska, Magdalena

doi:10.1039/b201427k

Cited by 55 publications

(85 citation statements)

References 26 publications

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“…Expressed in more fundamental terms, this corresponds to an acoustic phase shift (ϕ) greater than 20° [18] (below which the film is regarded as acoustically "thin") but less than 90° (where complications associated with film resonance arise [31][32][33]). The value of ϕ (for a shear acoustic wave of angular frequency, ω = 2πf) across a film of thickness h f and density ρ f is related to the viscoelastic properties of the film by [24,27]:…”

Section: Materials and Proceduresmentioning

confidence: 99%

“…and Z L is the characteristic mechanical impedance of the solution (a semi-infinite Newtonian fluid) [18,27]:…”

Section: Data Fittingmentioning

confidence: 99%

“…For calibration purposes, initial measurements were carried out on the bare crystal in air and in solution (both before film deposition) to obtain crystal and solution parameters, respectively [18,27].…”

Section: Instrumentationmentioning

confidence: 99%

“…Procedures for the extraction of shear moduli (storage and loss components) have been discussed in detail elsewhere [18,22,24,27,34]. Values of G′ and G″ were calculated using the Maple package by fitting experimental impedance (Z) data using [21,22,34,35]:…”

Section: Data Fittingmentioning

confidence: 99%

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The effect of anion identity on the viscoelastic properties of polyaniline films during electrochemical film deposition and redox cycling

Mohamoud

Hillman

2007

Electrochimica Acta

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Acoustic admittance measurements at thickness shear mode resonators were used to determine shear moduli for polyaniline films during their potentiodynamic electrodeposition and subsequent redox cycling in aqueous background electrolyte. Data were acquired for films doped with perchlorate, sulphate or chloride anion. For all media, film shear moduli increased progressively with film thickness, from values consistent with a diffuse fluid-like layer to values typical of a viscoelastic material. At any given thickness, both the storage and loss moduli were largest in perchlorate medium; values in chloride and sulphate media were similar to each other, but smaller than in perchlorate. These measures of polymer dynamics are consistent with a previous classification of polyaniline film behaviour, in which perchlorate-doped films are viewed as compact while chlorideand sulphate-doped films are viewed as more open. In monomer-free background electrolyte solution, both film shear modulus components for all anions increased modestly upon film oxidation. Despite some hysteresis on the timescale of slow scan voltammetry, these variations were chemically reversible. Based on measurements involving deposition from chloride medium and transfer to sulphate medium, film shear moduli respond promptly to changes in dopant identity; this is consistent with rapid redox-driven exchange of anions with the bathing electrolyte.

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Section: Materials and Proceduresmentioning

confidence: 99%

“…and Z L is the characteristic mechanical impedance of the solution (a semi-infinite Newtonian fluid) [18,27]:…”

Section: Data Fittingmentioning

confidence: 99%

Section: Instrumentationmentioning

confidence: 99%

Section: Data Fittingmentioning

confidence: 99%

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The effect of anion identity on the viscoelastic properties of polyaniline films during electrochemical film deposition and redox cycling

Mohamoud

Hillman

2007

Electrochimica Acta

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“…The viscoelastic properties of CPEs have been extensively investigated through the electroacoustic impedance method [31][32][33], by which the storage (G´) and loss moduli (G") of the polymer film can be determined. As the film ages, the viscoelastic changes may occur inside the film due to polymer chain rearrangements and species transfer through film/electrolyte interface [32].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and viscoelastic evolution of dodecyl sulfate-doped polypyrrole films during electrochemical cycling

Gao

Sel

Perrot

2017

Electrochimica Acta

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To cite this version:Wanli Gao, Ozlem Sel, Hubert Perrot. Electrochemical and viscoelastic evolution of dodecyl sulfatedoped polypyrrole films during electrochemical cycling. Electrochimica Acta, Elsevier, 2017, 233, pp.262 -273. 10 ABSTRACT:The correlation between electrochemical and viscoelastic properties of electrodeposited dodecylsulfate-doped polypyrrole (PPy-DS) during electrochemical cycling process was described through combining electrochemical quartz-crystal microbalance (EQCM), ac-electrogravimetric characterizations and electroacoustic measurements. As the PPy-DS electrode evolves during the course of consecutive cycling in aqueous NaCl electrolyte, the film exhibits (i) an obvious ion-selective transition from cations to anions in the charge compensation process; (ii) an inferior electrochemical performance accompanied with increased stiffness (increased storage moduli, G´); and (iii) depleted capability of ionic exchange through film/electrolyte interface. PPy-DS conducting polymer electrodes (CPEs) are of interest in energy storage and the relationship between electrochemical and viscoelastic properties during electrochemical cycling process is essential for promoting the performance of these devices. In this perspective, ac-electrogravimetry combined with electroacoustic measurements can be suggested as an alternative method to synchronously probe the electrochemical and mechanical evolution and has the potential to offer a generalized route to study aging mechanism of CPEs.

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Nanoscale Inhomogeneity of Conducting‐Polymer‐Based Materials

Pailleret

Semenikhin

2010

Nanostructured Conductive Polymers

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Dynamics of regioregular conducting polymer electrodes in response to electrochemical stimuli

Cited by 55 publications

References 26 publications

The effect of anion identity on the viscoelastic properties of polyaniline films during electrochemical film deposition and redox cycling

The effect of anion identity on the viscoelastic properties of polyaniline films during electrochemical film deposition and redox cycling

Electrochemical and viscoelastic evolution of dodecyl sulfate-doped polypyrrole films during electrochemical cycling

Nanoscale Inhomogeneity of Conducting‐Polymer‐Based Materials

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