Ion exchange behaviour and charge compensation mechanism of polypyrrole in electrolytes containing mono-, di- and trivalent metal ions

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Akieh MN, Price WE, Bobacka J, Ivaska A, Ralph SF
Publisher: ELSEVIER SCIENCE SA
Publication year: 2009
Journal: Synthetic Metals
Journal acronym: SYNTHETIC MET
Volume number: 159
Issue number: 23-24
Start page: 2590
End page: 2598
Number of pages: 9
ISSN: 0379-6779


Abstract

The electrochemical quartz crystal microbalance technique was used to examine the ion exchange behaviour and charge compensation mechanism of polypyrrole (PPy) doped with polystyrene sulfonate (PSS) immersed in electrolytes containing singly, doubly and triply charged metal ions. New insights were obtained concerning the mechanism of charge compensation and ion exchange behaviour of PPy/PSS films in electrolytes with triply and doubly charged transition metal ions. Understanding the ion exchange behaviour of conducting polymers immersed in these types of aqueous media could play a pivotal part in the development of methods for removing toxic metals from water supplies. Charge compensation occurred predominantly by means of cation movement for PPy/PSS films when the electrolyte was KNO3, Ca(NO3)(2), Mn(NO3)(2) or Co(NO3)(2). After prolonged redox cycling the electroactivity, of the polymer decreases slightly, and the charge compensation mechanism becomes complex owing to movement of ions and neutral species in opposite directions. The charge compensation mechanism for PPy/PSS films immersed in aqueous Cr(NO3)(3) and Al(NO3)(3) solutions was also complex, with the ion exchange behaviour shifting towards anion movement to and from the polymer. (C) 2009 Elsevier B.V. All rights reserved.


Keywords

Charge compensation, Polystyrene sulfonate, Quartz crystal microbalance, Trivalent metal ion

Last updated on 2020-24-02 at 03:46