Electrochemical impedance of microelectrodes

Rotenberg, Z. A.; Dribinskii, A. V.; Lukovtsev, V. P.; Khozyainova, N. S.

doi:10.1007/bf02757062

Cited by 7 publications

(16 citation statements)

References 4 publications

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“…It is reported that the reactant diffusion coefficient can be estimated using the frequency at which the finite length Warburg impedance arcs are maximal on the Z 00 -axis. The maximum frequency (m m ) is proportional to the diffusion coefficient and inversely to the square of diffusion layer thickness d [36,42,45,48,51]. The diffusion coefficient is expressed as…”

Section: Estimation Of Mass Transport Parametersmentioning

confidence: 99%

Polarization-dependent mass transport parameters for orr in perfluorosulfonic acid ionomer membranes: an EIS study using microelectrodes

Xie

Holdcroft

2004

Journal of Electroanalytical Chemistry

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Section: Estimation Of Mass Transport Parametersmentioning

confidence: 99%

Polarization-dependent mass transport parameters for orr in perfluorosulfonic acid ionomer membranes: an EIS study using microelectrodes

Xie

Holdcroft

2004

Journal of Electroanalytical Chemistry

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“…Finally, minus the imaginary part of the diffusion impedance, calculated at the apex of the Nyquist diagram, satisfies (ImZ c /R d ) Fp = 0.233 [40], therefore:…”

Section: Appendix a Faradaic Impedance Derived From Fleischmann And mentioning

confidence: 99%

“…First, using a computer algebra system like Mathematica [37], the low-frequency behaviour is readily obtained from the following limits: Next, the characteristic frequency corresponding to the apex of the diffusion impedance graph was given as u c,FP = 2.5 by Rotenberg et al [40], while Navarro-Laboulais et al [8] calculated numerically u c,FP = 2.5119. The more accurate value, u c,FP = 2.440, is proposed in this work [34].…”

Section: Appendix a Faradaic Impedance Derived From Fleischmann And mentioning

confidence: 99%

Numerical computation of the Faradaic impedance of inlaid microdisk electrodes using a finite element method with anisotropic mesh adaptation

Michel¹,

Montella²,

Verdier³

et al. 2010

Electrochimica Acta

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“…These differences are characterized by the occurrence of an additional arc at high frequencies and resistances of 7-8 kΩ. The arc is distorted probably because of the reductive behavior of the ISE active mass and changes in the electrical conductivity of the surface film [7]. That film may have a multilayer structure, which complicates the data interpretation.…”

mentioning

confidence: 94%

“…For convenience in comparing the data with other researches [2,3,7], we used out-of-system units for the ohmic component (R and θ) and the capacitative component (c in and c dl ) of the impedance, and also the electrochemical parameters (c 0 D 1/2 , j 0 ): Ω·cm 2 , F/cm 2 , A/cm 2 . Note.…”

mentioning

confidence: 99%

Faraday impedance analysis of the process at the boundary between a cadmium-selective electrode and a CdSO4 solution

et al. 2009

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Faraday impedance measurements have been made at alternating current frequencies of 0.01-200 kHz, and tests have been done on the process in the system provided by a Cd-SE with a CdSO 4 solution. There is a two-stage mechanism: in the first, a surface film is formed conducting Cd 2+ cations, and in the second, there are solid-state reactions in the SE membrane. An equivalent circuit is proposed that adequately describes the processes at the electrode, and basic parameters and diffusional and kinetic characteristics have been calculated for condensed and uncondensed electrodes. The diffusion and kinetic parameters show that the diffusion rate increases with the electrolyte concentration, with c 0 D 1/2 tending to increase, where c 0 and D are the initial molar concentration and diffusion coefficient of the potential-determining particles. The transport parameters and the exchange-current density have higher values for condensed electrodes.Air pollution is analyzed by various methods: biological, biochemical, chemical, electrochemical, and so on [1]. When one selects a method, the priority considerations are high speed and accuracy in the determination, low cost in implementing the method, and simplicity in the apparatus required for the measurements.In the 1970s, vigorous development began on potentiometric sensors. The greatest demand has been for ion-selective electrodes (ISE) for determining metal anions and cations, and also organic and surface-active substances in various media. Quantitative and qualitative determination of heavy metals, in particular cadmium in water, is based on ion-selective potentiometry, which is particularly important at present as these substances are widely used in industry and there is a lack of convenient methods of monitoring them.Ion-selective electrodes with liquid filling are used for the quantitative determination of cadmium ions, but on account of design features, they are not applicable in effluents and natural waters without preliminary sample preparation. Solid-contact electrodes are more convenient, and they can be used for continuous monitoring of cadmium ions and other heavy metals in technological solutions, water, and soil. However, a current problem [1] is to devise new, more effective, stable, sensitive, reliable, and long-lived electrodes.We have used the Faraday impedance method to examine the characteristics of cadmium-selective electrodes. We used electrodes based on cadmium and copper sulfides with the addition of thermally expanded graphite (TEG) and with the following composition in %: 47 CdS, 39 CuS, 4 TEG, and 10 BF-2 cement. Model solutions were aqueous solutions of cadmium sulfate of concentration starting with 100 mg/liter and subsequently diluted to half successively down to a concentration of 5·10 -8 mg/liter. The solutions were prepared from double-distilled water and chemically pure reagents by

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Electrochemical impedance of microelectrodes

Cited by 7 publications

References 4 publications

Polarization-dependent mass transport parameters for orr in perfluorosulfonic acid ionomer membranes: an EIS study using microelectrodes

Polarization-dependent mass transport parameters for orr in perfluorosulfonic acid ionomer membranes: an EIS study using microelectrodes

Numerical computation of the Faradaic impedance of inlaid microdisk electrodes using a finite element method with anisotropic mesh adaptation

Faraday impedance analysis of the process at the boundary between a cadmium-selective electrode and a CdSO4 solution

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