Electropolymerization of polypyrrole, modified with germanium, on a passivated titanium electrode in aqueous nitrate solution: new results on catalytic reduction of protons and dissolved oxygen |
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Authors: | S Mokrane L Makhloufi H Hammache B Saidani |
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Institution: | (1) Laboratoire d'Electrochimie et Corrosion, Institut de Chimie Industrielle, Université de Béjaia, 06000 Béjaia, Algeria, |
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Abstract: | Conductive polypyrrole (PPy) films and PPy films containing Ge microparticles were synthesized by anodic oxidation of pyrrole
in acidic nitrate solutions using a bare passivated titanium electrode. Well-adhering black PPy films were obtained both under
galvanostatic and potentiodynamic polarization. After the formation of the PPy film, during the first anodic cycle, an increase
of the anodic deposition current with the number of cycles was observed, revealing the increase of conductivity of the growing
film. The variations of the electrode surface area were estimated by impedance spectroscopy measurements. The kinetics of
the PPy film formation is controlled by diffusion of the Py monomer in the solution. The diffusion coefficient, estimated
by two different methods, was ca. 2×10–6 cm2 s–1. The reduction rate of oxygen and protons at the Ti/PPy/Ge electrodes depends on how the Ge microparticles are incorporated
in the PPy film. Optimum conditions for this incorporation are realized with thin PPy films and high Ge loading. Thermogravimetric
analysis shows that the PPy film containing Ge microparticles is more thermally stable than the blank PPy film.
Electronic Publication |
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Keywords: | Conducting polymers Polypyrrole Polymer-modified electrode Cyclic voltammetry Surface roughness |
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