Issue 8, 2018

The effect of electrolyte concentration on electrochemical impedance for evaluating polysulfone membranes

Abstract

A series of polysulfone membranes with different pore structures were prepared and characterized by electrochemical impedance spectroscopy (EIS). Two parameters, the membrane resistance and capacitance, were analyzed from the EIS data according to an equivalent circuit. It was found that the characteristic frequency obtained from the EIS data without any fitting was perfectly equivalent to the fitted parameters from theoretical calculations. Moreover, an additional time constant was observed under relatively low electrolyte concentration. This could be attributed to the capacitance response of the electrolyte at low electrolyte concentration and high frequency. The effect of electrolyte concentration on the impedance spectra of polysulfone membranes was then studied in detail, which can provide guidance for the selection of electrolyte concentration for efficient EIS analysis of membrane materials.

Graphical abstract: The effect of electrolyte concentration on electrochemical impedance for evaluating polysulfone membranes

Article information

Article type
Paper
Submitted
11 Apr 2018
Accepted
01 Jun 2018
First published
07 Jun 2018

Environ. Sci.: Water Res. Technol., 2018,4, 1145-1151

The effect of electrolyte concentration on electrochemical impedance for evaluating polysulfone membranes

Q. Huang, Q. Luo, Z. Chen, L. Yao, P. Fu and Z. Lin, Environ. Sci.: Water Res. Technol., 2018, 4, 1145 DOI: 10.1039/C8EW00225H

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