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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
Published on: July 20, 2021
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Profiled Ion-Exchange Membranes for Reverse and Conventional Electrodialysis
Sergey Loza1, Natalia Loza1, Natalia Kutenko1
1Physical Chemistry Department, Faculty of Chemistry and High Technologies, Kuban State University, 350040 Krasnodar, Russia.
Membranes
|October 27, 2022
Summary
Profiled ion-exchange membranes were investigated for reverse electrodialysis. While profiling increased permeability, it reduced conductivity and selectivity, ultimately not improving power density in reverse electrodialysis applications.
Area of Science:
- Materials Science
- Electrochemistry
- Chemical Engineering
Background:
- Ion-exchange membranes are crucial for reverse electrodialysis (RED).
- Optimizing membrane properties can reduce energy consumption and enhance RED efficiency.
- Surface modification of membranes is a key strategy for improving performance.
Purpose of the Study:
- To investigate the effect of surface profiling on ion-exchange membrane properties.
- To evaluate the performance of profiled membranes in reverse electrodialysis.
- To understand the relationship between membrane structure and electrochemical behavior.
Main Methods:
- Hot pressing of commercial cation-exchange (MK-40) and anion-exchange (MA-41) membranes to create profiled surfaces.
- Fabrication of bilayer membranes by casting MF-4SK film onto profiled surfaces.
- Measurement of diffusion permeability, conductivity, and current-voltage characteristics.
- Calculation of counter-ion transport numbers using the microheterogeneous model.
Main Results:
- Profiling increased diffusion permeability due to surface defects.
- Profiled membranes showed altered conductivity, generally lower in diluted solutions and higher in concentrated solutions, with exceptions for bilayer anion-exchange membranes.
- Selectivity decreased in profiled membranes due to increased solution phase thickness.
- Current-voltage curves exhibited asymmetry.
- No improvement in power density was observed when using profiled membranes in reverse electrodialysis.
Conclusions:
- Surface profiling of ion-exchange membranes alters their physical and electrochemical properties.
- The observed changes in permeability, conductivity, and selectivity did not translate to improved power density in reverse electrodialysis.
- Further research is needed to optimize profiling techniques for enhanced RED performance.
Keywords:
conductivitycurrent-voltage curvediffusion permeabilitymicroheterogeneous modelprofiled ion-exchange membranereverse electrodialysisselectivityMore Related Videos
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