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Electrochemical Preparation and Properties of Polypyrrole Membrane

Author: XueXiaoKang
Tutor: GuoXingPeng
School: Huazhong University of Science and Technology
Course: Applied Chemistry
Keywords: Polypyrrole Electrochemical polymerization Electrochemical properties pH sensor
CLC: O634.5
Type: Master's thesis
Year: 2005
Downloads: 800
Quote: 5
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Abstract


Synthesized by electrochemical polymerization of polypyrrole film was constructed with a platinum wire as the matrix potentiometric polypyrrole (PPy) pH sensors. ] structure, and explore the use of electrochemical impedance technique polypyrrole electrochemical impedance spectroscopy. Pt / PPy showed good potential response: In the pH range of 3 to 10, the slope of the Nernst 49.32mV/pH, good linearity, r = -0.9971, and shorter response times, and of conventional cation (K, Na) has a smaller coefficient of selectivity. Experimental results show that the undoped poly pyrrole (Pt / PPy) the H Nernst slope of the response, the conversion factor, and HCO3-ions doped [Pt / PPy (HCO3-)] or less, but the doping TsO - ion [Pt / PPy (TsO-)] is much smaller. Studied by electrochemical polymerization of polypyrrole degradation in alkaline solution behavior. Use chronocoulometry and cyclic voltammetry Pt / PPy electrode in acidic and alkaline solution redox properties. PPy in acid solution showed a stable electrochemical activity, but in alkaline solution, PPy lower electrochemical stability, electrochemical activity attenuation. IR and UV-visible spectra indicated that alkaline solution Polypyrrole OH-β position only attack polypyrrole form a carbonyl group, and the OH-is also possible to attack the formation of polypyrrole α position carboxyl degradation resulting polypyrrole. Study on graphite and platinum filament matrix electrochemical polymerization of polypyrrole film electrochemical performance explores the anion in polypyrrole film embedding / de-embedding mechanism. Using scanning electron microscopy of graphite / polypyrrole, platinum wire / polypyrrole, graphite / polypyrrole / carbon nano-powder electrode surface morphology differences. By cyclic voltammetry and electrochemical impedance studied these electrodes in 0.1mol / L LiClO4 aqueous solution, 0.1mol / L LiClO4 acetonitrile solution, 0.1mol / L LiClO4 1,2 - propanediol carbonate solution electrochemical properties. Cyclic voltammetry curves show that graphite / polypyrrole, graphite / polypyrrole / carbon nano-powder electrode with redox properties. Redox process of graphite / polypyrrole electrodes integral power than platinum wire / polypyrrole integral power. In Li aqueous graphite / PPy electrode integral power than pure power graphite electrodes integral multi-41.59%, graphite / polypyrrole / carbon nano-powder electrode integral power than pure power graphite electrodes integral multi-70.54%. Graphite / PPy electrode type electrolytic solution than the charge transfer resistance of the platinum wire / PPy electrode is significantly reduced, and the graphite / PPy electrode electrolyte solution in different electric double layer capacitor is greater than the platinum wire / polypyrrole electrode double layer capacitor.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Elements of the organic polymer > Section Ⅴ group elements, organic polymers
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