Geometric Requirements of Solid Electrolyte Cells with a Reference Electrode

Winkler, Jochen; Hendriksen, Peter Vang; Bonanos, Nikolaos; Mogensen, Mogens Bjerg

doi:10.1149/1.1838436

Cited by 229 publications

(203 citation statements)

References 8 publications

(9 reference statements)

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“…In general, these results are in good agreement with those based in physical models (4,7), equivalent circuits (3) and finite element-based techniques (5). The general conclusion is that the symmetrical cells should be prefered to ensure an homogeneous potential distribution, especially with thin electrolytes.…”

Section: Resultssupporting

confidence: 80%

See 1 more Smart Citation

Papel de la posición del electrodo de referencia en las medidas de sobrepotencial

Figueiredo¹,

Frade²,

Marques³

1999

Bol. Soc. Esp. Ceram. Vidr.

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Steady state polarisation measurements can be affected by electrode microstructure and geometrical arrangement. In particular, the relative position of the reference electrode with respect to the working and counter electrodes may influence the reference potential and therefore effect the overvoltage readings. The influence of the geometrical arrangement of the electrodes on the electrolyte potential lines, was simulated by solving the appropriate Maxwell equations. Simulations were in relatively good agreement with steady state polarisation and impedance spectroscopy results obtained with YSZ|LaMnO 3 -based cells. The use of impedance spectroscopy to assess the appropriateness of a given electrode configuration is suggested.

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Section: Resultssupporting

confidence: 80%

“…One of the main causes for such scatter is the electrode microstructure due to the use of a variety of deposition techniques (1). However, the electrodes geometrical arrangement is also recognised as a key factor to ensure the reproducibility of polarisation measurements (2,3,4,5).…”

Section: Introductionmentioning

confidence: 99%

Papel de la posición del electrodo de referencia en las medidas de sobrepotencial

Figueiredo¹,

Frade²,

Marques³

1999

Bol. Soc. Esp. Ceram. Vidr.

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“…The electrochemical characterization of thin solid electrolyte fuel cells, for example, showed that results were RE position dependent and prone to errors (Fiaud et al, 1987;Hsieh et al, 1997;Piela et al, 2007;Winkler et al, 1998;Zeng et al, 2010). When the RE is placed in a region of nonuniform current density, the RE can possibly sample a range of equipotential surfaces, resulting in the discrepancies in the measurements (Hsieh et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…When the RE is placed in a region of nonuniform current density, the RE can possibly sample a range of equipotential surfaces, resulting in the discrepancies in the measurements (Hsieh et al, 1997). The frequency dependent equipotential line shift will also contribute errors to the impedance measurements (Winkler et al, 1998). So far, the RE placement and IR errors have received insufficient attention in BES studies.…”

Section: Introductionmentioning

confidence: 99%

Reference and counter electrode positions affect electrochemical characterization of bioanodes in different bioelectrochemical systems

Zhang

Liu²,

Ivanov³

et al. 2014

Biotech & Bioengineering

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The placement of the reference electrode (RE) in various bioelectrochemical systems is often varied to accommodate different reactor configurations. While the effect of the RE placement is well understood from a strictly electrochemistry perspective, there are impacts on exoelectrogenic biofilms in engineered systems that have not been adequately addressed. Varying distances between the working electrode (WE) and the RE, or the RE and the counter electrode (CE) in microbial fuel cells (MFCs) can alter bioanode characteristics. With well-spaced anode and cathode distances in an MFC, increasing the distance between the RE and anode (WE) altered bioanode cyclic voltammograms (CVs) due to the uncompensated ohmic drop. Electrochemical impedance spectra (EIS) also changed with RE distances, resulting in a calculated increase in anode resistance that varied between 17 and 31 V (À0.2 V). While WE potentials could be corrected with ohmic drop compensation during the CV tests, they could not be automatically corrected by the potentiostat in the EIS tests. The electrochemical characteristics of bioanodes were altered by their acclimation to different anode potentials that resulted from varying the distance between the RE and the CE (cathode). These differences were true changes in biofilm characteristics because the CVs were electrochemically independent of conditions resulting from changing CE to RE distances. Placing the RE outside of the current path enabled accurate bioanode characterization using CVs and EIS due to negligible ohmic resistances (0.4 V). It is therefore concluded for bioelectrochemical systems that when possible, the RE should be placed outside the current path and near the WE, as this will result in more accurate representation of bioanode characteristics.

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“…The cathode fits were obtained using a constant phase element (CPE) in place of the C d . In-depth analysis of the fitted circuit elements is ill-advised, because studies [18,19] have indicated that bonding a reference electrode to the same face of a solid electrolyte as the working electrode likely produces erroneous data. Researchers also showed that the high-and low-frequency intercepts may be shifted and that an extraneous arc may exist at the frequency limits.…”

Section: Equivalent Circuit Modelsmentioning

confidence: 99%

Diffusion and Gas Conversion Analysis of Solid Oxide Fuel Cells at Loads via AC Impedance

Payne

Zhu

et al. 2011

International Journal of Electrochemistry

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Impedance measurements were conducted under practical load conditions in solid oxide fuel cells of differing sizes. For a 2 cm 2 button cell, impedance spectra data were separately measured for the anode, cathode, and total cell. Improved equivalent circuit models are proposed and applied to simulate each of measured impedance data. Circuit elements related to the chemical and physical processes have been added to the total-cell model to account for an extra relaxation process in the spectra not measured at either electrode. The processes to which elements are attributed have been deduced by varying cell temperature, load current, and hydrogen concentration. Spectra data were also obtained for a planar stack of five 61 cm 2 cells and the individual cells therein, which were fitted to a simplified equivalent circuit model of the total button cell. Similar to the button cell, the planar cells and stack exhibit a pronounced low-frequency relaxation process, which has been attributed to concentration losses, that is, the combined effects of diffusion and gas conversion. The simplified total-cell model approximates well the dynamic behavior of the SOFC cells and the whole stack.

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Geometric Requirements of Solid Electrolyte Cells with a Reference Electrode

Cited by 229 publications

References 8 publications

Papel de la posición del electrodo de referencia en las medidas de sobrepotencial

Papel de la posición del electrodo de referencia en las medidas de sobrepotencial

Reference and counter electrode positions affect electrochemical characterization of bioanodes in different bioelectrochemical systems

Diffusion and Gas Conversion Analysis of Solid Oxide Fuel Cells at Loads via AC Impedance

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