Impedance spectroscopy: Over 35 years of electrochemical sensor optimization

Pejcic, Bobby; Marco, Roland De

doi:10.1016/j.electacta.2006.04.025

Cited by 240 publications

(154 citation statements)

References 213 publications

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“…The fitted model is shown in figure 11. It can be observed that the model given by equation (16) fits perfectly the experimental ℋ 8 curve in the linear zone: the associated determination coefficient is 3 = 99.998%. It can be deduced that the proposed expression actually explains the experimental shape of the ℋ 8 curve in the linear region.…”

Section: Noise Quantificationmentioning

confidence: 77%

“…It has been applied to a wide range of different fields as fuel cells [5][6][7][8][9][10], batteries [11][12], coatings [13][14], electrochemical reaction kinetics [15], electrochemical sensors [16][17][18][19], supercapacitors [20][21][22] and dielectrics [23]. This electrochemical measurement technique has also been used in fields that are not traditionally linked to electrochemistry as enzymatic kinetics [24], cancer detection [25], biochemistry [26][27] and immunology [28][29] amongst others.…”

Section: Introductionmentioning

confidence: 99%

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Total harmonic distortion based method for linearity assessment in electrochemical systems in the context of EIS

Giner-Sanz

Ortega

Pérez-Herranz

2015

Electrochimica Acta

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ElsevierGiner Sanz, JJ.; Ortega Navarro, EM.; Pérez-Herranz, V. (2015). Total harmonic distortion based method for linearity assessment in electrochemical systems in the context of EIS. Electrochimica Acta. 186:598-612. doi:10.1016Acta. 186:598-612. doi:10. /j.electacta.2015 Electrochemical Impedance Spectroscopy (EIS) is a widely used electrochemical measurement technique that has been used in a great spectrum of fields since it allows deconvolving the individual physic-chemical processes that take place in a given system. Ohm's generalized law, and thus the impedance concept, are only valid if 4 conditions are fulfilled: causality, finiteness, stationarity and linearity. In the case that any of these conditions is not achieved, the obtained impedance spectra will present distortions that may lead to biased or even erroneous results and conclusions. For this reason it is crucial to verify if the 4 conditions are fulfilled, before accepting the results extracted from impedance spectra. In this work, a linearity assessment quantitative method based in the total harmonic distortion (THD) parameter is presented and verified experimentally. The experimental validation of the implemented method showed that the implemented method is able to assess quantitatively the linearity of the system. In addition, it is also able to determine the threshold frequency above which the system will not present significant nonlinear effects even for large perturbation amplitudes. It was observed that the THD method is more sensitive to nonlinear effects than the spectra themselves.

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Section: Noise Quantificationmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Total harmonic distortion based method for linearity assessment in electrochemical systems in the context of EIS

Giner-Sanz

Ortega

Pérez-Herranz

2015

Electrochimica Acta

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“…30 Accordingly, to corroborate the result from the pulsed chronopotentiometric experiments, a parallel EIS measurement was performed under the same experimental conditions. In the complex-plane plot of Figure 6, the so-called Warburg diffusion impedance, as expressed by a phase shift of 45° at low frequencies for the blank sensing membrane, is increased when polyelectrolyte multilayers are coated.…”

Section: Resultsmentioning

confidence: 95%

Kinetic Modulation of Pulsed Chronopotentiometric Polymeric Membrane Ion Sensors by Polyelectrolyte Multilayers

Shvarev

et al. 2007

Anal. Chem.

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Polymeric membrane ion selective electrodes are normally interrogated by zero current potentiometry, and their selectivity is understood to be primarily dependent on an extraction/ionexchange equilibrium between the aqueous sample and polymeric membrane. If concentration gradients in the contacting diffusion layers are insubstantial, the membrane response is thought to be rather independent of kinetic processes such as surface blocking effects. In this work, the surface of calcium-selective polymeric ion-selective electrodes is coated with polyelectrolyte multilayers as evidenced by zeta potential measurements, atomic force microscopy and electrochemical impedance spectroscopy. Indeed, such multilayers have no effect on their potentiometric response if the membranes are formulated in a traditional manner, containing a lipophilic ion-exchanger and a calcium-selective ionophore. However, drastic changes in the potential response are observed if the membranes are operated in a recently introduced kinetic mode using pulsed chronopotentiometry. The results suggest that the assembled nanostructured multilayers drastically alter the kinetics of ion transport to the sensing membrane, making use of the effect that polyelectrolyte multilayers have different permeabilities toward ions with different valences. The results have implications to the design of chemically selective ion sensors since surface localized kinetic limitations can now be used as an additional dimension to tune the operational ion selectivity.Polymer membrane ion-selective electrodes are widely established for the reliable assessment of ion activities in complex samples and are indispensable tools in clinical analysis. Their ionselectivity is dictated by the thermodynamic ion-exchange selectivity of the polymer membrane. Recently, ion-selective membrane electrodes have started to be interrogated by pulsed chronopotentiometry. In this new technique, a discrete current pulse is imposed across an ion-selective membrane void of added ion-exchanger sites. The potential change associated with the resulting ion flux from the sample into the sensing phase can be monitored during or, at open circuit, immediately after the pulse before the membrane is regenerated under controlled potential conditions. At high sample concentrations the observed sensitivity (electrode slope) and selectivity normally agrees with that of the corresponding ion-selective electrodes interrogated at zero current. 1, 2 The imposed ion flux, however, depletes the analyte ions in the Nernst diffusion layer at a critical concentration, and very large (ca. 10-fold Nernstian) electrode slopes are observed in this concentration range. 3 The operational ion Ultra-thin films assembled from alternate adsorption of polycations and polyanions onto a charged substrate has attracted much attention in recent years due to their facile fabrication, high versatility and multi-functionality. The application of this technique has expanded into a number of areas, including biosensor surface modificat...

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“…From C s or |Z s | change, it is easy to monitor biological molecules binding to the gold surface. In the last four decades, many impedance spectroscopy methods were developed for biological sample detection on gold surfaces (Pejcic and Marco, 2006). The ECIS spectra provided an alternative method in this area.…”

Section: Using Ecis To Monitor L-cysteine Binding To Gold Surfacementioning

confidence: 99%

A simple mathematical model for electric cell-substrate impedance sensing with extended applications

Xiao

Luong

2010

Biosensors and Bioelectronics

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Impedance spectroscopy: Over 35 years of electrochemical sensor optimization

Cited by 240 publications

References 213 publications

Total harmonic distortion based method for linearity assessment in electrochemical systems in the context of EIS

Total harmonic distortion based method for linearity assessment in electrochemical systems in the context of EIS

Kinetic Modulation of Pulsed Chronopotentiometric Polymeric Membrane Ion Sensors by Polyelectrolyte Multilayers

A simple mathematical model for electric cell-substrate impedance sensing with extended applications

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