Abstract
To study the effect of cation-exchange layer thickness on the electrochemical and transport characteristics of bipolar membranes (BPM), asymmetric BPM with varied cation-exchange layer thickness (of 10, 30, 50 and 70 μm) were investigated. High influence of BPM monopolar layers thickness on its selectivity had been shown. This fact is non-trivial in relation to monopolar ion-exchange membranes as their selectivity does not depend on their thickness. At the same time, increase or decrease in the thickness of BPM monopolar layers can increase products purity or, on the contrary, combine ion transport and pH shift functions.
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Abbreviations
- T i :
-
Effective transport number of ion
- t mi :
-
Electromigration transport number of ion
- Pi :
-
Diffusive permeability of the membrane to ion (mol/cm2 s)
- ΔCi :
-
Concentration difference on the inlet and outlet of cell (mol/L)
- i :
-
Current density (mA/cm2)
- S:
-
Membrane active area (cm2)
- Rb :
-
Resistance of the reaction layer (Ohm cm2)
- R0 :
-
Real part of impedance at low frequency (Ohm cm2)
- R∞ :
-
Real part of impedance at high frequency (Ohm cm2)
- Rwd :
-
Resistance of the space charge region (Ohm cm2)
- ηb :
-
Bipolar region overvoltage (V)
- U:
-
Voltage (V)
- Uw :
-
Operating voltage at which water dissociation occurs (V)
- j i :
-
Flux of ions (mol/cm2 s)
- dCEL :
-
Thickness of cation-exchange layer (microns)
- Di :
-
Diffusion coefficient of ion inside the membrane (m2/s)
- χ:
-
Effective water dissociation constant (s−1)
- ω:
-
Angular frequency
- ZG :
-
Gerischer impedance
- ZW :
-
Finite Warburg impedance
- Zsp :
-
Impedance of the space charge region
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Acknowledgments
The reported study was partially supported by Russian Foundation for Basic Research, research projects No. 11-08-00718-a, 12-08-31277-mol_a.
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Zabolotskii, V., Sheldeshov, N. & Melnikov, S. Effect of cation-exchange layer thickness on electrochemical and transport characteristics of bipolar membranes. J Appl Electrochem 43, 1117–1129 (2013). https://doi.org/10.1007/s10800-013-0560-3
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DOI: https://doi.org/10.1007/s10800-013-0560-3