Modeling Asymmetry of a Current-Voltage Curve of a Novel MF-4SC/PTMSP Bilayer Membrane.

Anatoly N Filippov,Natalia A Kononenko,Daria A Petrova,Natalia V Loza

doi:10.3390/membranes12010022

Abstract

A novel bilayer cation-exchange membrane—consisting of a thick layer of a pristine perfluorinated membrane MF-4SC (Russian equivalent of Nafion®-117) and a thinner layer (1 μm) of the membrane, on a base of glassy polymer of internal microporosity poly(1-trimethylsilyl-1-propyne) (PTMSP)—was prepared and characterized. Using the physicochemical characteristics of one-layer membranes MF-4SC and PTMSP in 0.05 M HCl and NaCl solutions, the asymmetric current–voltage curves (CVC) of the bilayer composite were described with good accuracy up to the overlimiting regime, based on the “fine-porous membrane” model. The MF-4SC/PTMSP bilayer composite has a significant asymmetry of CVC that is promising for using it in electromembrane devices, such as membrane detectors, sensors, and diodes.

Highlights

The asymmetry of transport properties is an important feature of bilayer membranes
The asymmetry of the current–voltage curves (CVC) was detected at single pores of the track-etched membrane [8]
This property can be promising for creating membrane diodes, when a bilayer membrane passes current well in one direction, and practically does not pass it in the contrary direction [9,10]

Summary

Introduction

When the direction of the driving force (pressure or concentration gradients, electric field) changes, the flux density of solvent, solute [1,2], and electric current [2,3,4,5,6,7] can change significantly In the latter case, an asymmetry of the current–voltage curves (CVC) is observed. The asymmetry of the CVC was detected at single pores of the track-etched membrane [8] This property can be promising for creating membrane diodes, when a bilayer membrane passes current well in one direction, and practically does not pass it in the contrary direction [9,10]

Objectives

Results

Conclusion