Theoretical and Experimental Investigation of Limiting Diffusion Current in the Systems with Modified Perfluorinated Membranes Containing Sulfonic Acid Groups

Kononenko, N. A.; Demina, O. A.; Loza, N. V.; Dolgopolov, S. V.; Timofeev, S. V.

doi:10.1134/s1023193521050062

Cited by 6 publications

(1 citation statement)

References 37 publications

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“…There are a number of possible reasons that could lead to such changes which should be considered. The limiting current density is calculated by the formula

where δ is the thickness of the diffusion layer [ 84 ]. It is obvious that the decreases in the transport number of the counter-ion in the membrane, the membrane thickness, the thickness of the diffusion layer, and the increase in the diffusion permeability after profiling lead to the rise of the i lim value.…”

Section: Resultsmentioning

confidence: 99%

Profiled Ion-Exchange Membranes for Reverse and Conventional Electrodialysis

Loza

Kutenko

et al. 2022

Membranes

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Profiled ion-exchange membranes are promising for improving the parameters of reverse electrodialysis due to the reduction of pumping power and electrical resistance. The smooth commercial heterogeneous cation-exchange MK-40 and anion-exchange MA-41 membranes were chosen as the initial membranes. Profiled membranes with three different types of surface profiles were obtained by hot pressing the initial membranes. The bilayer membranes were made on the basis of single-layer profiled membranes by casting MF-4SK film on the profiled surfaces. The diffusion permeability of all types of single-layer and bilayer profiled membranes was higher than of the initial ones due to the appearance of large defects on their surface during pressing. The conductivity of the profiled membrane was lower in the diluted solution and higher in the concentrated solution than of the initial one for all samples except for the bilayer anion-exchange membrane. The conductivity of that sample was lower than that of the initial anion-exchange MA-41 membrane over the entire range of studied concentrations. The counter-ion transport numbers for all studied membranes were calculated based on the concentration dependences of conductivity and diffusion permeability of the membrane by the microheterogeneous model. The selectivity of single layer and bilayer profiled membranes became lower after their profiling due to the increase of the solution phases of membranes. The asymmetry of the current-voltage curves for all single-layer and bilayer profiled membranes was found. The application of the single layer and bilayer profiled membranes in reverse electrodialysis did not lead to an increase in power density.

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“…There are a number of possible reasons that could lead to such changes which should be considered. The limiting current density is calculated by the formula

Section: Resultsmentioning

confidence: 99%