Validation and evaluation of electrochemical impedance spectra of systems with states that change with time

Schiller, Carl-Albrecht; Richter, F.; Gülzow, Erich; Wagner, Norbert

doi:10.1039/b007678n

Cited by 97 publications

(63 citation statements)

References 4 publications

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“…Impedance features very similar to the artefacts seen here, such as the effect of the stray-capacitance of the lead wires [27,28], can arise in relation to other processes not included in the model. However, such features can be unequivocally identified once the cell configuration has been validated and the presence of distortions related to the 3-electrode configuration has been excluded.…”

Section: Guidelines For the Design Of 3-electrode Experimental Sofcmentioning

confidence: 79%

Distortions in Electrochemical Impedance Spectroscopy Measurements Using 3‐Electrode Methods in SOFC. II. Effect of Electrode Activity and Relaxation Times

2007

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The 3‐electrode configuration is commonly applied to quantify the overpotential of anodes or cathodes in solid‐oxide fuel cells (SOFC). In this type of set‐up, a reference electrode (RE) is used to isolate the potential loss of one electrode from that of the entire cell; however, erroneous results can be obtained whenever the RE does not precisely separate the potential drop between the two active electrodes. In this study, we present the results of a theoretical and experimental analysis focused on verifying the effectiveness of the 3‐electrode configuration in electrochemical impedance spectroscopy measurements for the kinetic characterisation of SOFC electrode reactions. The focus of this paper is on the distortion of impedance measurements caused by differences in the area‐specific polarisation resistance and impedance time constants of the working and counter electrodes. The results obtained numerically and experimentally, both for planar and tubular SOFC cell geometries, prove the reliability of the theoretical model used. From the systematic simulation presented here and in our previous work, it was possible to formulate general guidelines for the design of 3‐electrode experimental SOFC. The theoretical model used here can also be used to verify the consistency of EIS measurements obtained with thin planar cells.

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Section: Guidelines For the Design Of 3-electrode Experimental Sofcmentioning

confidence: 79%

Distortions in Electrochemical Impedance Spectroscopy Measurements Using 3‐Electrode Methods in SOFC. II. Effect of Electrode Activity and Relaxation Times

2007

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“…Impedance correction due to temporal instabilities have been described by several authors [22,23], however, such corrections were not performed for the present experiments.…”

Section: Modelling the Impedance Responsementioning

confidence: 95%

CO Tolerance of Commercial Pt and PtRu Gas Diffusion Electrodes in Polymer Electrolyte Fuel Cells

Hajbolouri

Andreaus

Scherer³

et al. 2004

Fuel Cells

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The CO tolerance of commercial Pt and PtRu anode electrodes from different suppliers (E‐Tek and Tanaka) has been examined in polymer electrolyte fuel cells (PEFC) using AC‐impedance spectroscopy along steady‐state current‐voltage curves. A simple mathematical model has been derived in order to extract important kinetic parameters for CO poisoning on different anode electrodes. The Tanaka PtRu (40:60) electrode demonstrated the best CO tolerance under the selected operating conditions.Inductive behavior in the low frequency region of the impedance spectra for the E‐Tek Pt and PtRu electrode proved to be characteristic for CO poisoning. However, the impedance spectra of the Tanaka PtRu electrode did not show any inductive behavior and its CO surface coverage, extracted by fitting the experimental data to the model, was lower than the surface CO coverage of the E‐Tek electrodes.

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“…Although a proper transformation requires the full set of data between 0 and 1, (8) can be approximated by (10) [102]: …”

Section: Validation Of the Data: Kramer-kronig Transformationsmentioning

confidence: 99%

Advanced and In Situ Analytical Methods for Solar Fuel Materials

Chan

Tüysüz

Braun

et al. 2015

Topics in Current Chemistry

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In situ and operando techniques can play important roles in the development of better performing photoelectrodes, photocatalysts, and electrocatalysts by helping to elucidate crucial intermediates and mechanistic steps. The development of high throughput screening methods has also accelerated the evaluation of relevant photoelectrochemical and electrochemical properties for new solar fuel materials. In this chapter, several in situ and high throughput characterization tools are discussed in detail along with their impact on our understanding of solar fuel materials.

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Validation and evaluation of electrochemical impedance spectra of systems with states that change with time

Cited by 97 publications

References 4 publications

Distortions in Electrochemical Impedance Spectroscopy Measurements Using 3‐Electrode Methods in SOFC. II. Effect of Electrode Activity and Relaxation Times

Distortions in Electrochemical Impedance Spectroscopy Measurements Using 3‐Electrode Methods in SOFC. II. Effect of Electrode Activity and Relaxation Times

CO Tolerance of Commercial Pt and PtRu Gas Diffusion Electrodes in Polymer Electrolyte Fuel Cells

Advanced and In Situ Analytical Methods for Solar Fuel Materials

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