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Method for enhancing electrochemical activity of polyaniline in neutral medium

A neutral medium and activity-enhancing technology, applied in the field of electrochemistry, can solve the problems of unsatisfactory polyaniline and poor cycle stability, and achieve the effects of improving electrochemical activity, increasing specific surface area, and increasing surface area

Inactive Publication Date: 2016-03-23
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have a certain effect on improving the electrochemical activity of polyaniline in a neutral environment, their cycle stability is generally poor, which still cannot meet the requirements of practical application of polyaniline.

Method used

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  • Method for enhancing electrochemical activity of polyaniline in neutral medium
  • Method for enhancing electrochemical activity of polyaniline in neutral medium

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Firstly, TiO was prepared by constant-voltage secondary anodic oxidation method. 2 Electrode: Anodic oxidation is carried out in a two-electrode system with titanium foil as the working electrode and carbon rod as the counter electrode. The electrolyte is 0.5wt% NH 4 F and 2vol%H 2 O solution in ethylene glycol. First, the titanium foil was ultrasonically cleaned with acetone, ethanol and water for 10 min in sequence. The first anodic oxidation was carried out at a constant voltage of 60V for 2h, and then the oxide film was removed by ultrasonication for 30min, and the pitted titanium foil was cleaned with acetone, ethanol and water in sequence. Then carry out the second anodic oxidation, the oxidation conditions are the same as the first oxidation, the anodic oxidation time is 30min, and the TiO is taken out after the oxidation is completed. 2 The electrodes were rinsed with deionized water and dried. The prepared amorphous TiO 2 The electrode is an ordered nanotu...

Embodiment 2

[0029] Except changing the secondary anodic oxidation time of titanium foil to 10 min; the electrochemical deposition time of tungsten oxide to 150 s; and the number of scanning circles for polyaniline polymerization to be 5 circles, all other materials and process conditions are the same as in Example 1. The test method of the cyclic voltammetry performance of the polyaniline film is also the same as in Example 1. The results show that the strong peaks at around 0.4V and 0.2V on the cyclic voltammetry curve correspond to the redox process of polyaniline, and the peak current is significantly higher than that of Comparative Example 1, indicating that the polyaniline film has a significantly enhanced electrochemical activity. After 200 cycles of continuous scanning, the electrode still has stable electrochemical activity, and the peak current and peak position remain basically unchanged compared with the first cycle.

Embodiment 3

[0031] Except changing the titanium foil anodizing voltage to 15V; the secondary anodizing time to 10min; the electrochemical deposition time of tungsten oxide to 400s; the number of scan cycles for polyaniline polymerization to be 15, all other materials and process conditions are the same as in Example 1 . The test method of the cyclic voltammetry performance of the polyaniline film is also the same as in Example 1. The results show that the strong peaks at around 0.4V and 0.2V on the cyclic voltammetry curve correspond to the redox process of polyaniline, and the peak current is significantly higher than that of Comparative Example 1, indicating that the polyaniline film has a significantly enhanced electrochemical activity. After 200 cycles of continuous scanning, the electrode still has stable electrochemical activity, and the peak current and peak position remain basically unchanged compared with the first cycle.

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Abstract

The invention discloses a method for enhancing the electrochemical activity of polyaniline in a neutral medium. Firstly, titanium is oxidized under constant pressure by an anodic oxidation method and a titanium oxide nanotube array is obtained. Then an ammonium chloride solution serves as an electrolyte solution, and an annealed titanium oxide electrode is subjected to electrochemical reduction through a cyclic voltammetry method. Then the reduced titanium oxide electrode serves as a working electrode, a sodium tungstate solution serves as an electrolyte solution, electrochemical deposition of tungsten oxide is conducted through the constant pressure method at the room temperature, a titanium oxide / tungsten oxide compound film is prepared, and annealing treatment is conducted. Finally, the electrode of the titanium oxide / tungsten oxide compound film serves as a working electrode, a sulfuric acid aqueous solution containing aniline monomers serves as an electrolyte solution, electrochemical polymerization is conducted through the cyclic voltammetry method at the room temperature, and a polyaniline compound film is prepared. The method enables the polyaniline to have higher electrochemical activity in the neutral solution with the pH of 7.0, so that the polyaniline is better applied in the fields such as biosensors and metal corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and relates to a method for enhancing the electrochemical activity of polyaniline in a neutral medium. The polyaniline prepared by this method can be used in the field of bioengineering. Background technique [0002] Polyaniline is a conductive polymer with special electrochemical and optical properties. After a certain treatment of polyaniline, various materials and devices with special functions can be prepared, such as urease sensors, electron field emission sources, which can be used as biological or chemical sensors, and have better performance than traditional lithium electrode materials in the process of charging and discharging. Reversible electrode materials, selective membrane materials, anti-static and electromagnetic shielding materials, conductive fibers, anti-corrosion materials, etc. [0003] Polyaniline is conductive after doping, which is a very important feature of pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/08C25D11/26C25D9/08C25D17/10C08G73/02
Inventor 陈泽君秦怡宋晔朱绪飞
Owner NANJING UNIV OF SCI & TECH
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