Electrochemical Synthesis And Properties Of Poly(Azure C) And Poly(Aniline-co-azure C)

Conducting polymers as new materials have been widely used in rechargeable batteries, electrocatalysis, electrochromic device, photoelectric conversion, super capacitor and other fields. Among the numerous conductive polymers, polyaniline is the most promising polymer material. In this paper, Poly(azure C) and poly(aniline-co-azure C) were synthesized by means of cyclic voltammetry. Then we studied electrochemical activity of poly(azure C) and poly(aniline-co-azure C). The copolymer can be used as a battery cathode material. The ideas and methods of experiments are important for the study and development of other conductive polymers.1. Electrosynthesis and electrochemical and electrochromic properties of poly(azure C) filmPoly(azure C) was prepared on the platinum foil using cyclic voltammetry. The p H of the monomer solution and applied oxidization potential strongly affected the polymerization rate and electroactivity of the polymer. The polymer electrosynthesized on the optimum conditions had a high electroactivity in 0.20 mol·L-1 phosphate buffer solution containing 0.25 mol·L-1 Na Cl with p H≤11.00. This is attributed to the presence of phenothiazine rings on the polymer chain. The polymer film displayed a multicolor electrochromic behavior when the applied potential was changed. The chemical structure of the polymer was characterized by UV-visible, infrared and X-ray photoelectron spectroscopies. The scanning electron microscopy image showed that the polymer film had a micro-wrinkled surface with topographic features.2. Nonenzymatic hydrogen peroxide sensor based on poly(azure C)Poly(azure C) was utilized as an electrocatalyst to lower the overpotential of hydrogen peroxide(H2O2) oxidation compared to bulk platinum. The electrocatalyst was prepared by potential cycling from a phosphate buffer solution containing N-methylthionine and sodium chloride on a platinum foil electrode. Cyclic voltammetry and chronoamperometry showed the Poly(azure C) electrode had an excellent electrocatalytic activity toward H2O2 oxidation. Furthermore, the poly(azure C) electrode was found to be promising as an amperometric detector for H2O2. The propsoed nonenzymatic H2O2 sensor exhibited a wide linear range(1–700 μmol·L-1), fast response(2 s), low detection limit(0.12 μmol·L-1), high sensitivity, and long-term stability, plus low cost.3. Electrosynthesis and electrochemical and electrochromic properties of poly(aniline-co-azure C)A novel conducting polymer, poly(aniline-co-azure C), is synthesized in a mildly acidic aqueous solution using cyclic voltammetry. The rate of copolymerization and the electrochemical properties of the obtained copolymers are substantially affected by p H, upper potential limit and comonomer concentration ratio. The copolymer possesses a high electrochemical activity in an aqueous solution up to p H 10.0. The copolymer formed on an indium-tin oxide glass electrode exhibits a black-to-transmissive electrochromism under relatively low potentials. The results from the Fourier transformed infrared spectroscopy and X-ray photoelectron spectroscopy of the copolymer show that NMTh units and Cl- ions were incorporated into the copolymer backbone during the electrosynthesis. The scanning electron microscopy micrograph demonstrates that the copolymer film is composed of polymeric flower-like microparticles with an average diameter of 1μm.4. Hydrogen peroxide biosensor based on poly(aniline-co-azure C)Poly(aniline-co-azure C) was prepared at a platinum electrode using cyclic voltammetry. A hydrogen peroxide biosensor was fabricated using electrochemical doping to immobilize hydrogen peroxidase in the copolyer film. Cyclic voltammetry and chronoamperometry demonstrate that the enzyme electrode has good electro-catalytic reduction of H2O2. The response current of the biosensor was strongly affected by p H, operational potential, temperature, and the concentration of H2O2. Under the optimum conditions, the response currents have a good linear relation with the concentration of H2O2 from 5.0 μmol·L-1 to 60.0 mmol·L-1, respectively.5. A rechargeable Zn- poly(aniline-co-azure C) batteryElectrochemical synthesis of poly(aniline-co-azure C) was electrosynthesized from an aqueous sulfuric acid soluntion containing aniline and azure C. The copolymer was characterized using cyclic voltammetry, UV-visible spectroscopy, infrared spectroscopy and scanning electron microscopy. Based on the cyclic voltammograms and impedance spectra of poly(aniline-co-azure C) in the electrolyte solution containing Zn Cl2 and NH4 Cl, a solution containing 2.0 mol·L-1 Zn Cl2 and 3.0 mol·L-1 NH4 Cl was used as an electrolyte, poly(aniline-co-azure C) as a cathode, zinc tablet as an anode for secondary batteries. The battery was charged and discharged between 0.7 and 1.5 V at different current densities using chronopotentiometry. It eas found that when the constant current charge and discharge density of 2 m A·cm-2, the secondary battery has a more large capacity density and maximum coulombic efficiency. At the 150 th charge-discharge cycle, the coulombic efficiency of 98.2%, indicating that the secondary battery has a good charge and discharge performance.