Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.

Issue 6, 2017
Previous Article Next Article

Voltammetric determination of diffusion coefficients in polymer membranes

Author affiliations


The diffusion-controlled transport of ions and molecules through polymer membranes utilized in chemical and biosensors is often the key factor determining the response characteristics of these sensors. In this paper, a simple voltammetric method is described for the determination of diffusion coefficients of redox molecules in resistive polymer membranes using a planar electrochemical cell (PEC) with a 5 μm radius carbon fiber as working electrode. In the proposed method, the diffusion coefficients are assessed from the scan rate dependence of the peak (or limiting) currents in linear sweep or cyclic voltammograms. The accuracy of the method is estimated through simulations using the method of Nicholson and Shain describing the quantitative relationship between the measured peak current (ip) and the square root of the scan rate (v1/2). The proposed method has been used for measuring the diffusion coefficients of ferrocene derivatives in highly resistive aqueous solutions, organic solvents, plasticizers, and plasticized PVC membranes. The measured diffusion coefficients are in agreement with theoretical models and previously reported values.

Graphical abstract: Voltammetric determination of diffusion coefficients in polymer membranes

Back to tab navigation

Supplementary files

Article information

16 Dec 2016
14 Feb 2017
First published
14 Feb 2017

Analyst, 2017,142, 930-937
Article type

Voltammetric determination of diffusion coefficients in polymer membranes

J. B. Sheppard, B. Hambly, B. Pendley and E. Lindner, Analyst, 2017, 142, 930
DOI: 10.1039/C6AN02671K

Social activity

Search articles by author