Frequency Dispersion in Capacity Measurements at a Disk Electrode

Newman, John

doi:10.1149/1.2407464

Cited by 158 publications

(149 citation statements)

References 7 publications

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“…The size of admittance maps is influenced by the AC frequency because the potential distribution depends on this parameter in the case of nonuniform potential distribution induced by the cell geometry. This phenomenon was first predicted theoretically by Newman [19] for a disk electrode embedded in an isolating plane, then expanded and explained in details for other systems in more recent works [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 69%

“…The mathematical foundation for the simulation of the potential and current distributions was adapted from the works by Newman [19,26] originally developed for a planar disk electrode embedded in a coplanar insulator and successfully applied to other cell geometries in order to investigate the edge effect of the electrode on the impedance response [21,24,25]. This treatment accounts for both the potential drop due to the ohmic resistance of the media and the electrode polarization.…”

Section: Numerical Modelmentioning

confidence: 99%

“…The local impedance was shown to depend not only on f but also on r 0 , C and σ s allowing a dimensionless frequency K to be defined as [19,21] …”

Section: Influence Of the Ac Frequency On The Derivative Of Local Admmentioning

confidence: 99%

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Development of quantitative Local Electrochemical Impedance Mapping: an efficient tool for the evaluation of delamination kinetics

Shkirskiy

Volovitch

Vivier

2017

Electrochimica Acta

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To cite this version:V Shkirskiy, P Volovitch, Vincent Vivier. Development of quantitative Local Electrochemical Impedance Mapping: an efficient tool for the evaluation of delamination kinetics. Electrochimica Acta, Elsevier, 2017, 235, pp.442-452 AbstractLocal Electrochemical Impedance Mapping (LEIM) methodology was adopted to quantify the propagation of electrochemically active regions with a micrometric precision. The method consisted in the use of the gradient modulus of the admittance map as a parameter for the spatial quantification. Numerical simulations were used to optimize the experimental conditions, namely the AC frequency, the distance between the local bi-probe and the working electrode, and the distances between the probes for the local bi-probe used for the local current mapping. This analysis was reinforced by experimental verifications on coated electrodes. The quantitative LEIM methodology was successfully applied to follow the delamination kinetics on Zn coated with the polyvinyl butyral polymer in NaCl solutions. At 1 kHz, the LEIM response only reflected the position of the anodic front beneath the polymer because oxygen reduction reaction was diffusion limited and hence, independent of the applied potential. This novel LEIM methodology completes the set of usual tools used to investigate the delamination mechanisms on metal substrates.

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Section: Introductionmentioning

confidence: 69%

Section: Numerical Modelmentioning

confidence: 99%

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Development of quantitative Local Electrochemical Impedance Mapping: an efficient tool for the evaluation of delamination kinetics

Shkirskiy

Volovitch

Vivier

2017

Electrochimica Acta

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“…In contrast to electrodes of conventional dimensions, the measured current is considerably lower. As a result, the ohmic IR drop, even in organic solvents with high resistance, can often be kept sufficiently low [7][8][9][10] and voltammetric experiments can be performed with a specific 'low current' module. On the other hand, a better resolution and lower detection limits are obtained with microelectrodes and array structures because of the enhanced mass transport of electroactive species from radial diffusion [11,12].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical deposition of 5,10,15,20-tetrakis-(4-sulphonatophenyl) porphyrin and its Co(II) derivative at a gold microelectrode array

Wael

Adriaens

Temmerman

2005

Analytica Chimica Acta

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This paper describes the fabrication and surface modification of gold microelectrode array structures. The modification is done by continuous cycling of the electrode array in a pH 12 buffer solution containing 8.01 mmol L −1 5,10,15,20-tetrakis-(4-sulphonatophenyl)porphyrin tetrasodium salt (H 2 TSPor). Incorporation of gold ions in the ligand during the potential cycling of the gold electrode is assumed. Only ring processes appear in the current potential curves, which do not change with scan number, indicating a fast adsorption. A second modification was performed through the electrodeposition of 5,10,15,20-tetrakis-(4-sulphonatophenyl)porphyrin Co(II) (CoTSPor) at a gold micro-electrode array.

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“…Deviations from ldeality may occur in these cases, owing to rather trivial effects such as capdlary response or creeping [1], shielding by the glass capillary [2,3], and contamination of the mercury surface. The result of such effects is usually a curved complex plane plot, approaching the straight vertical line at higher frequencies.…”

mentioning

confidence: 99%

The analysis of electrode impedances complicated by the presence of a constant phase element

Brug¹

1984

Journal of Electroanalytical Chemistry

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The electrical double-layer at a solid electrode does not m general behave as a pure capacitance but rather as an impedance displaying a frequency-independent phase angle different from 90 o Ways are indicated how to analyse the interracial impedance ,f such a complication arises in the presence of a faradalc process, both on the supposition that the double-layer behavlour is due to surface mhomogenelty and on the supposition that it is a double-layer property per se As examples, the equations derived are successfully apphed to a totally Irreversible and an ac quasi-reversible electrode process at a gold electrodeAccording to conventional double-layer theories, the impedance Z of an ideally polarized electrode consists of a capacitance (Cd) in series with the solution resistance (R e), and consequently the corresponding complex plane diagram (Z" vs. Z') should exhibit a straight vertical line intersecting the horizontal axis at Z' = R e, while the ordinates along this line equal Z" = (~0Cd) -a.This ideal behaviour is experimentally best observed at mercury/(aqueous) solution interfaces, for example at a dropping mercury electrode (DME), a hanging mercury drop electrode (HMDE), or a mercury pool electrode. Deviations from ldeality may occur in these cases, owing to rather trivial effects such as capdlary response or creeping [1], shielding by the glass capillary [2,3], and contamination of the mercury surface. The result of such effects is usually a curved complex plane plot, approaching the straight vertical line at higher frequencies. A less trivial deviation may be caused by diffusion-controlled adsorption of species present at a low concentration.Also at solid electrodes interfering effects, especially contamination and surface roughness, are hkely to be present, but apart from these a more marked behavlour 0022-0728/84/$03 00

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Frequency Dispersion in Capacity Measurements at a Disk Electrode

Cited by 158 publications

References 7 publications

Development of quantitative Local Electrochemical Impedance Mapping: an efficient tool for the evaluation of delamination kinetics

Development of quantitative Local Electrochemical Impedance Mapping: an efficient tool for the evaluation of delamination kinetics

Electrochemical deposition of 5,10,15,20-tetrakis-(4-sulphonatophenyl) porphyrin and its Co(II) derivative at a gold microelectrode array

The analysis of electrode impedances complicated by the presence of a constant phase element

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