Simplified model to predict the effect of the leakage current on primary and secondary current distributions in electrochemical reactors with a bipolar electrode

Henquín, E. R.; Bisang, Jose Maria

doi:10.1007/s10800-005-9029-3

Cited by 20 publications

(28 citation statements)

References 13 publications

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“…6. The experimental current distributions at the bipolar electrode are more uniform than at the terminal electrodes, which corroborates the tendency also observed for the primary case [1,2]. However, an important variation in the current density takes place in the first segment near the manifold, which disagrees with the theoretical model and can be attributed to a change in effective electrolyte resistance due to the gas evolved at the electrodes.…”

Section: Methodssupporting

confidence: 80%

“…However, this advantage is counteracted by the existence of leakage currents, which cause a decrease in current efficiency, current distribution along the electrodes and the possibility of corrosion zones in the reactor. The authors have previously proposed a simplified model to predict the effect of the leakage current on the current distribution [1]. In [2] the primary current distribution obtained by the numerical solution of the Laplace equation was reported and compared with experimental results.…”

mentioning

confidence: 99%

“…In [2] the primary current distribution obtained by the numerical solution of the Laplace equation was reported and compared with experimental results. The state of the art related to bipolar electrochemical reactors has recently been described [1,2]. Some authors have analyzed particular aspects of these devices.…”

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confidence: 99%

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Effect of leakage currents on the secondary current distribution in bipolar electrochemical reactors

Henquín

Bisang

2008

J Appl Electrochem

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The secondary current distribution in an electrochemical stack with one bipolar electrode was experimentally determined and compared with the theoretical prediction according to the Laplace equation. A close agreement between both results is reported. The parameters acting upon the current distribution were lumped into a dimensionless variable, called the bipolar Wagner number, and its effect on the current distribution and predictive suitability of the theoretical treatment is discussed.

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Section: Methodssupporting

confidence: 80%

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confidence: 99%

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Effect of leakage currents on the secondary current distribution in bipolar electrochemical reactors

Henquín

Bisang

2008

J Appl Electrochem

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“…Rousar and Thonstad [15] informed about the calculation of by-pass currents and current distribution in molten salt bipolar cells with open channels to allow the circulation of the electrolyte. Recently, in [16] a simplified mathematical model to calculate the current distribution in bipolar electrochemical reactors was developed and comparisons between calculated and experimental primary current distributions were reported. This model satisfactorily predicted the current distribution at the terminal electrodes for the highest by-pass resistances.…”

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confidence: 99%

Effect of leakage currents on the primary current distribution in bipolar electrochemical reactors

Henquín

Bisang

2007

J Appl Electrochem

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The primary current distribution in a bipolar electrochemical reactor with outside inlet and outlet electrolyte manifolds was investigated by numerical solution of the Laplace equation and by experimental measurement in simulated cells made from conductive paper and segmented electrodes. The geometric parameters determining the distribution were the interelectrode gap, electrode length, transverse section and length of the electrolyte manifold. The effect of the number of electrodes in the bipolar stack was also analysed. Values obtained numerically have been compared with those obtained experimentally and a good agreement is observed between them. These results are useful for estimating the performance of the bipolar stack. List of symbols aGeometric parameter of the manifold (m) A Transverse section of the electrolyte manifold (m 2 ) bGeometric parameter of the manifold (m) d r Mean relative deviation (%) eInterelectrode gap (m) G Length of the electrolyte manifold (m) jCurrent density (A m -2 ) j mean Mean current density (A m -2 )

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“…Recently, Henquin and Bisang [19] proposed a simplified mathematical model of the current density distribution, enabling prediction of the effects of the geometry and operational variables on the current distributions at the bipolar and terminal electrodes. The important parameters were combined into two dimensionless parameters.…”

Section: Introductionmentioning

confidence: 99%

Potential and current density distributions along a bipolar electrode

et al. 2007

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Potential and current density distributions were modelled and measured for an electrochemical cell with a bipolar electrode. The dimension of the bipolar electrode in the direction of current flow was extended, to enable experimental determination of the electrode potential and the local current densities at various positions inside the electrolyte and in the electrode body. The experimental results showed that the most active regions of the bipolar electrode are located at the ends of the bipolar electrode facing the terminal electrodes. The equations corresponding to the mathematical model of the experimental cell were solved using the finite volume method and gave very good qualitative agreement with the experimental data. However, some discrepancies between model predictions and experimental data were evident in the active parts of the bipolar electrode and in the variation of the terminal voltage with the total current. This was explained in terms of the active electrolyte cross-section and the electrode surface area being diminished due to the presence of gas bubbles in the system.Keywords Bipolar electrode Á Mathematical modelling Á Parasitic current Á Local potential and current density distribution Nomenclature A F Cross-sectional area of the free electrolyte space beside the bipolar electrode (m 2 ) d G Inter-electrode distance (m) d E Bipolar electrode thickness (m) E Electrode potential (V) f E Current utilisation in a bipolar cell (-) I Current (A) I E Current flowing through bipolar electrode (A) I P Parasitic current (A) I T Total current (A) j Current density (A m -2 ) n Vector normal to the boundary (m) N Number of electrolytic cells (-) r Radius (m) RResistivity (X) R F Electrolyte resistivity in the fictitious electrolyser (X) R G Average resistivity of the inter-electrode gap (X) R S Short-circuit resistivity (X) S Electrode surface (m 2 ) U Voltage (V) U r Open-circuit cell voltage (V)xPosition along the cell (m)Greek letters u Galvani potential (V) r Conductivity (S m -1 ) j F Electrolyte conductivity (S m -1 ) g Overpotential (V)

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Simplified model to predict the effect of the leakage current on primary and secondary current distributions in electrochemical reactors with a bipolar electrode

Cited by 20 publications

References 13 publications

Effect of leakage currents on the secondary current distribution in bipolar electrochemical reactors

Effect of leakage currents on the secondary current distribution in bipolar electrochemical reactors

Effect of leakage currents on the primary current distribution in bipolar electrochemical reactors

Potential and current density distributions along a bipolar electrode

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