Calculation of Current Density Distribution and Terminal Voltage for Bipolar Electrolyzers; Application to Chlorate Cells

Roušar, I.

doi:10.1149/1.2412015

Cited by 41 publications

(28 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Indeed, as experimentally confirmed by Thorpe and coworkers (79,152) at a water electrolysis cell, the slip ratio of gas bubbles and surrounding liquid is for practical purposes equal to unity. It would thus appear an adequate simplification to completely disregard the rising velcoity v, instead of VL • Rousar and coworkers carried out a detailed analysis of flowing electrolyte in cells with bipolar (153)(154)(155)(156) and unipolar electrodes. (157) The basis of the work is discussed in the following, disregarding here the effect of potential drop in the electrodes and the bubble separator channels.…”

Section: B3 Current Distribution and Ohmic Resistancementioning

confidence: 99%

Gas-Evolving Electrodes

Vogt¹

1983

Comprehensive Treatise of Electrochemistry

View full text Add to dashboard Cite

Section: B3 Current Distribution and Ohmic Resistancementioning

confidence: 99%

Gas-Evolving Electrodes

Vogt¹

1983

Comprehensive Treatise of Electrochemistry

View full text Add to dashboard Cite

“…There are several equations to calculate vs~, which are summarized in [41. Taking into account the Richardson-Zaki equation for v~w and Equation 4, Rousar [5] and Rousar et al [6] have modelled monopolar and bipolar electrolyzers.…”

Section: + Qa/gmentioning

confidence: 99%

“…and the total current I is given by I = Wf2 i(y) dy (15) Furthermore, the Kreysa and Kuhn expression (Equation 5) is used to describe the gas voidage in each compartment as a function of the position and the gas velocity referred to the cross-section of the compartment, Vgj~ is given by …”

Section: Constant(2) = (S~ + Nm~s D + S~)p~mentioning

confidence: 99%

Theoretical and experimental studies of current distribution in gas-evolving electrochemical reactors with parallel-plate electrodes

Bisang

1991

J Appl Electrochem

View full text Add to dashboard Cite

The current density distributions for a gas evolving electrochemical reactor with parallel-plate electrodes at different total currents were measured and calculated. The current density profiles were determined using a segmented electrode method. The numerically computed curves, according to a one-dimensional model, and the experimental measurements show good agreement. Furthermore, a comparison between several mathematical models is made. Nomenclature

show abstract

“…According to [21], the terminal electrodes and one half of the inter-electrode gaps adjacent to them, form a fictitious cell through which the total current flows. Each bipolar electrode with one half of the inter-electrode gap on each side, represents another fictitious cell, short-circuited by the resistor R s .…”

Section: Introductionmentioning

confidence: 99%

Potential and current density distributions along a bipolar electrode

et al. 2007

View full text Add to dashboard Cite

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)

show abstract

Calculation of Current Density Distribution and Terminal Voltage for Bipolar Electrolyzers; Application to Chlorate Cells

Cited by 41 publications

References 4 publications

Gas-Evolving Electrodes

Gas-Evolving Electrodes

Theoretical and experimental studies of current distribution in gas-evolving electrochemical reactors with parallel-plate electrodes

Potential and current density distributions along a bipolar electrode

Contact Info

Product

Resources

About