Potentiometric properties of polypyrrole bilayers

• Published in: Electrochimica acta Vol. 49; no. 11; pp. 1767 - 1774
• Main Authors: Alumaa, A., Hallik, A., Mäeorg, U., Sammelselg, V., Tamm, J.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 30.04.2004; Elsevier
• Subjects: Applied sciences; Bilayers; Degradation; Exact sciences and technology; Open-circuit relaxation; Organic polymers; Physicochemistry of polymers; Polypyrrole; Potentiometric response; Properties and characterization; Solution and gel properties; Degradation; Open-circuit relaxation; Potentiometric response; Polypyrrole; Bilayers; Electrolyte solution; Electromotive force; Bilayer; Conducting polymers; Cyclic voltammetry; Nitrogen heterocycle polymer; Electrochemical properties; Potentiometric method; Redox potential; Pyrrole polymer
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2003.12.008

The spatially separated polypyrrole (PPy) bilayers composed of easily (PPy/Cl) and heavily permeable (PPy/dodecylsulfate) for anions component layers have been prepared by consecutive electrodeposition. The set-up of quasi-equilibrium potential E r during conditioning in the solution of electrolyte and the potentiometric response of bilayers to ions and redox system in the test solution were studied. The short-term potentiometric response of the bilayer system is mainly determined by the outer layer. The participation of the inner layer is related with permeability of the outer layer and with sensitivity of the inner layer to the ions of the test solution, and leads to the dependence of the electrode potential on the duration of the bilayer system’s exposure to the test solution.