On porous electrodes in electrolyte solutions—IV

Levie, Robert de

doi:10.1016/0013-4686(64)85015-5

Cited by 544 publications

(331 citation statements)

References 18 publications

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“…The impedance of a CPE can be calculated by means of Equation 6 45 , at which Q is the CPE constant and α is the dispersion factor, other variables having their usual meaning. For α = 1, Q is a pure capacitor and the electrode behaves ideally, α = 0.5 is obtained when a diffusion-controlled process occurs 46,47 or when the electrode is porous 48,49 , whereas for 0.5 < n < 1.0 the deviation from the ideal capacitive behaviour is attributed to heterogeneities in the electrode surface or to non-homogeneous current distribution on the electrode surface 50,51 . Table 3 shows the results of the EEC fitting procedure.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Evaluation of Castor Bark Powder as a Corrosion Inhibitor for Carbon Steel in Acidic Media

et al. 2017

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The inhibition effect of castor bark powder obtained from Ricinus communis on AISI 1020 carbon steel in acidic media (HCl 0.5 mol.L -1 ) has been studied by electrochemical impedance spectroscopy (EIS), polarization curves, scanning vibrating electrode technique (SVET) and weight loss measurements. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were employed as characterization techniques. The EIS and gravimetric results showed that the inhibitory efficiency increases with inhibitor concentration achieving 83%. Polarization curves indicated that the castor bark powder acts as mixed inhibitor. The adsorption of the powder components on the metal surface follows the Langmuir isotherm. The FTIR analyses indicate the presence of C, N and O heteroatoms, incorporated in functional groups mainly related to the presence of carboxylic acids as ricinoleic acid, which could be responsible for the inhibitory properties of the powder. SEM analyses showed that the corrosion process was retarded in the presence of inhibitor in the electrolyte, which was confirmed by SVET measurements. Therefore, the results indicate that castor bark powder has potential to be a corrosion inhibitor for carbon steel in acidic media.

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Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Evaluation of Castor Bark Powder as a Corrosion Inhibitor for Carbon Steel in Acidic Media

et al. 2017

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“…The modelling of porous solids, in the case of an interface that is blocking to charge transfer, has reached a high level of sophistication [96][97][98][99][100][101]. The standard model is an array of identical pores arranged in parallel.…”

Section: Electrochemical Equivalent Circuit Of Carbon-based Supercapamentioning

confidence: 99%

A universal equivalent circuit for carbon-based supercapacitors

Fletcher

Black

Kirkpatrick

2013

J Solid State Electrochem

136

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A universal equivalent circuit is proposed for carbon-based supercapacitors. The circuit, which actually applies to all porous electrodes having non-branching pores, consists of a single vertical ladder network in series with an RC parallel network. This elegant arrangement explains the three most important shortcomings of present-day supercapacitors, namely open circuit voltage decay, capacitance loss at high frequency, and voltammetric distortion at high scan rate. It also explains the shape of the complex plane impedance plots of commercial devices and reveals why the equivalent series capacitance increases with temperature. Finally, the construction of a solid-state supercapacitor simulator is described. This device is based on a truncated version of the universal equivalent circuit, and it allows experimenters to explore the responses of different supercapacitor designs without having to modify real supercapacitors.

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“…The CPE represents the surface roughness, which for a capacitance is characterized by an admittance k(iw) a , where k is a constant, w is the angular frequency, i is the imaginary unit, and the exponent a varies from 1, for a smooth surface, to 0.5 for a porous electrode [31]. The Bode plots in Figure 6 give examples of impedance spectra of a 1-dodecanethiol monolayer formed on gold at 0.9 V (vs. Ag/AgCl/saturated KCl) in 1000 s, with those of clean gold and from a monolayer formed at open circuit potential, for comparison.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Studies on Self‐Assembled Alkanethiol Monolayers Formed at Applied Potential on Polycrystalline Gold Electrodes

et al. 2003

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1-Dodecanethiol assembly on polycrystalline gold electrodes at fixed positive potentials has been investigated by chronoamperometry and electrochemical quartz crystal microbalance and the films formed characterized by cyclic voltammetry and electrochemical impedance spectroscopy. It was found that 1-dodecanethiol adsorption on gold is enhanced by application of positive potentials to the electrode surface and that adsorption proceeds faster than in the case of open circuit deposition. Compact defect-free monolayers of capacitance values of 1.1 ± 1.6 mF cm À2 are produced in time intervals as short as 100 s, with no roughness, as demonstrated for the first time by electrochemical impedance analysis. Control of surface potential during alkanethiol assembly appears to improve monolayer quality and to allow for shorter assembly periods. Monolayers can be removed by cycling in alkaline solution or in dilute sulfuric acid. These results are important for the fast construction of defect-free bilayers.

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On porous electrodes in electrolyte solutions—IV

Cited by 544 publications

References 18 publications

Evaluation of Castor Bark Powder as a Corrosion Inhibitor for Carbon Steel in Acidic Media

Evaluation of Castor Bark Powder as a Corrosion Inhibitor for Carbon Steel in Acidic Media

A universal equivalent circuit for carbon-based supercapacitors

Studies on Self‐Assembled Alkanethiol Monolayers Formed at Applied Potential on Polycrystalline Gold Electrodes

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