scholarly journals The current distribution in an electrochemical cell. Part VI: The quantitative treatment for cells with three plane parallel electrode arrangements

2001 ◽  
Vol 66 (7) ◽  
pp. 491-498 ◽  
Author(s):  
K.I. Popov ◽  
S.M. Pesic ◽  
P.M. Zivkovic
Keyword(s):  
Quantitative Determination ◽  
Density Distribution ◽  
Current Distribution ◽  
Current Density ◽  
Electrochemical Cell ◽  
Current Density Distribution ◽  
Plane Parallel ◽  
Parallel Electrode ◽  
Quantitative Treatment

Amethod for the quantitative determination of the current density distribuion in cells with a three plane parallel electrode arrangement is proposed. It is shown that the current density distribution can be determined using the data obtained by simple polarization measurements. The relation to the Haring-Blum cell with P = 2 is discussed.

scholarly journals The current distribution in an electrochemical cell. Part V: The determination of the depth of the current line penetration between the edges of the electrodes and the side walls of the cell

1999 ◽  
Vol 64 (12) ◽  
pp. 795-800 ◽  
Author(s):  
Konstantin Popov ◽  
Slavisa Pesic ◽  
Tanja Kostic
Keyword(s):  
Current Distribution ◽  
Electrochemical Cell ◽  
Polarization Curves ◽  
Current Line ◽  
Plane Parallel ◽  
Electrode Arrangement ◽  
A Cell ◽  
Side Walls ◽  
Parallel Electrode

A method for the calculation of the depth of the current line penetration between the edges of the electrodes and the side walls of the cell in a cell with plane parallel electrode arrangement is proposed. The method is verified by the calculation of the polarization curves for the cells in which the electrode edges do not touch the side walls of the cell. The agreement between the calculated and the measured values was fair.

scholarly journals The effect of electrodeposition process parameters on the current density distribution in an electrochemical cell

2001 ◽  
Vol 66 (2) ◽  
pp. 131-137
Author(s):  
K.I. Popov ◽  
R.M. Stevanovic ◽  
P.M. Zivkovic
Keyword(s):  
Density Distribution ◽  
Current Distribution ◽  
Current Density ◽  
Electrochemical Cell ◽  
Common Knowledge ◽  
Cell Voltage ◽  
Current Density Distribution ◽  
Deposition Process ◽  
Exchange Current ◽  
Diffusion Control

Cell voltage - current density dependences for a model electrochemical cell of fixed geometry were calculated for different electrolyte conductivities, Tafel slopes and cathodic exchange current densities. The ratio between the current density at the part of the cathode nearest to the anode and the one furthest away were taken as a measure for the estimation of the current density distribution. The calculations reveal that increasing the conductivity of the electrolyte, as well as increasing the cathodic Tafel slope should both improve the current density distribution. Also, the distribution should be better under total activation control or total diffusion control rather than at mixed activation- diffusion-Ohmic control of the deposition process. On the contrary, changes in the exchange current density should not affect it. These results, being in agreement with common knowledge about the influence of different parameters on the current distribution in an electrochemical cell, demonstrate that a quick estimation of the current distribution can be performed by a simple comparison of the current density at the point of the cathode closest to anode with that at furthest point.

scholarly journals The current distribution in an electrochemical cell. Part VII. Concluding remarks

2002 ◽  
Vol 67 (4) ◽  
pp. 273-278 ◽  
Author(s):  
Konstantin Popov ◽  
S.M. Pesic ◽  
Predrag Zivkovic
Keyword(s):  
Process Parameters ◽  
Current Distribution ◽  
Current Density ◽  
Electrochemical Cell ◽  
Side Wall ◽  
Cell Geometry ◽  
Electrode Edge ◽  
Side Walls ◽  
In Cells

Anew method for the determination of the ability of an electrolyte to distribute uniformly current density in an electrochemical cell is proposed. It is based on the comparison of the current in cells in which the electrode edges touch the cell side walls with the current in cells with different electrode edge ? cell side wall distances. The effects of cell geometry process parameters and current density are discussed and illustrated using the results presented in the previous papers from this series.

scholarly journals A mathematical model of the current density distribution in electrochemical cells

2011 ◽  
Vol 76 (6) ◽  
pp. 805-822 ◽  
Author(s):  
Konstantin Popov ◽  
Predrag Zivkovic ◽  
Nebojsa Nikolic
Keyword(s):  
Mathematical Model ◽  
Density Distribution ◽  
Current Distribution ◽  
Current Density ◽  
Current Density Distribution ◽  
Theoretical Explanation ◽  
Electrochemical Kinetics ◽  
Complete Analysis ◽  
Electrochemical Cells ◽  
Corner Effects

An approach based on the equations of electrochemical kinetics for the estimation of the current density distribution in electrochemical cells is presented. This approach was employed for a theoretical explanation of the phenomena of the edge and corner effects. The effects of the geometry of the system, the kinetic parameters of the cathode reactions and the resistivity of the solution are also discussed. A procedure for a complete analysis of the current distribution in electrochemical cells is presented.

Experiment Study on the Current Density Distribution of PEMFC by Segmented Cell Technology

2020 ◽  
Author(s):  
Tianwei Miao ◽  
Xu Xie ◽  
Chasen Tongsh ◽  
Jinqiao Liang ◽  
Yiqi Liang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Density Distribution ◽  
Current Distribution ◽  
Current Density ◽  
Proton Exchange Membrane ◽  
Current Density Distribution ◽  
Cold Start ◽  
Proton Exchange ◽  
Cell Technology ◽  
Segmented Cell

Abstract The homogeneous of current density distribution is very important for performance and lifetime of proton exchange membrane fuel cell. In this study the current density distribution of a fuel cell with an active area of 108 cm2 has been investigated by using segmented cell technology. The σc is introduced to evaluate the homogeneity of current density and the smaller value of σc represents better homogeneity of current distribution. Under normal conditions, the experimental results show that the current density decreases progressively along the flow field at low cathode stoichiometry. It is also found that the homogeneity of current distribution has a strong correlation with the membrane hydration condition and always performs best at cathode relative humidity of 80% when anode condition keeps constant. The value of σc can be significantly reduced when cathode stoichiometry increases from 1.5 to 2.5, but it changes little when cathode stoichiometry continues to increase. During the cold start process, the evolutions of current density distribution are consistent with the temperature mappings. The form of stabilized heat core in the middle regions and homogeneous current density distribution are necessary for successful cold start. The value of σc also can be used to evaluate that the cold start succeeds or not.

scholarly journals A new dimensionless group for the estimation of the current density distribution in an electrochemical cell

2005 ◽  
Vol 70 (2) ◽  
pp. 251-253 ◽  
Author(s):  
Konstantin Popov ◽  
S.M. Pesic ◽  
Predrag Zivkovic
Keyword(s):  
Density Distribution ◽  
Current Density ◽  
Electrochemical Cell ◽  
Cell Voltage ◽  
Current Density Distribution ◽  
Dimensionless Group ◽  
The Absolute

Anew dimensionless group for the estimation of the current density distribution in an electrochemical cell is defined as the ratio of the sum of the absolute values of the anodic and cathodic over potentials to the overall cell voltage.

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