Polypyrrole film electrodes

Sodium dodecyl sulfate has been used to modify polypyrrole film electrodes. Electrodes synthesized in the presence of sodium dodecyl sulfate have improved redox processes which are faster and more reversible than those prepared without this surfactant. The electrochemical behavior of these electrodes was investigated by cyclic voltametry and frequence response analysis. The electrodes used in lithium/organic electrolyte batteries show improved performance [195]. 

These studies have been mainly carried out using cyclic voltammetry and frequency response analysis as experimental tools. As a typical example. Fig. 9.12 illustrates the voltammogram related to the p-doping process of a polypyrrole film electrode in the LiClQ -propylene carbonate electrolyte, i.e. the reaction already indicated by (9.16). 

Polypyrrole Film Electrode Incorporating Glucose Oxidase... 

SUN TACHIKAWA Polypyrrole Film Electrode with Glucose Oxidase 135... 

On the other hand, Chen et al. developed polypyrrole film electrodes containing nanodispersed platinum particles and investigated their catalytic properties for the electro-oxidation of hydrogen [13]. They confirm the remarkable electrocatalytic activity of these PPy/Pt films compared to bulk platinum electrodes, as the film thickness increases to 5 pm. 

Chemically Modified Conducting Polypyrrole Film Electrodes... 

More recently, Chen el al. developed polypyrrole film electrodes containing nanodispersed platinum particles and investigated their catalytic properties for... 

C.C. Chen, C.S.C. Bose, and K. Rajeshwar, The reduction of dioxygen and the oxidation of hydrogen at polypyrrole film electrodes containin nanodispersed platinum particles, J. Electroanal Chem., 350, 161-176 (1993). 

Okabayashi, K., O. Ikeda, and H. Tamura (1983). Electrochemical doping with mes o-tetrakis(4-sulphonatophenyl)-porphyrincobalt of a polypyrrole film electrode. J. Chem. Soc., Chem. Commun. 684-685. 

Bedioui, R, C. Bongars, C. Hinnen, C. Bied-Charreton, and J. Devynck (1985). In-situ characterization of redox properties of mes otetrakis (4-carboxyphenyl) porphine cobalt in a polypyrrole film electrode using the electroreflectance technique. Bull. Soc. Chim. Er. 679-682. 

Bedioui, F., C. Bongars, J. Devynck, C. Bied-Charreton, and C. Hinnen (1986). Met-alloporphyrin polypyrrole film electrode—characterization and catalytic application. J. Electroanal Chem. 207, 87-99. 

Polypyrrole can be synthesized by the galvanostatic or potentiostatic electrolysis of nonaqueous or aqueous solution containing pyrrole monomer and supporting electrolyte. Metals, such as Pt and Au, carbon, or semiconductors can be used as electrode materials. Pt is most often used for electrochemical measurements of polypyrrole film electrodes. The physical and electrochemical properties of synthesized polypyrrole are greatly influenced by the electrolysis current, potential conditions, electrode materials, concentrations of the pyrrole monomer and supporting electrolyte, electrolyte (dopant) and solvent materials, temperature, and so on. 

The spectroscopic measurement can be made in response to either a potential (or current) step or a potential sweep. Examples of the latter approach are contained in Fig. 20.28a and 20.28b for UV-vis and Raman scattering measurements on a polypyrrole film electrode in aqueous media [144]. The dAldtantX dIldt(A = optical absorbance, I = Raman scattered light intensity) derivative signals versus potential have the shapes of cyclic voltammograms with the important difference that the spectroscopic signals are species-selective. 

Z. Sun and H, Tachikawa, Polypyrrole film electrode incorporating glucose oxidase, in Biosensors and Chemical Sensors. Optimizing Performance Through Polymeric Materials (P. G. Edelman and J. Wang, eds.), ACS Symp. Ser. 487, Am. Chem. Soc., Washington, DC, 1992, p. 134. 

Ikeda O, Okabayashi K, Yoshida N, Tamura H (1985) Spectroelectrochemical study of oxygen reduction at metalloporph3Tin-doped polypyrrole film electrodes. J Electroanal Chem 191 157-174... 

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