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Method for realizing stable electrochemical activity of polyaniline in neutral medium

A neutral medium, electrochemical technology, applied in the field of electrochemistry, can solve the problems of poor cycle stability and inability to meet the needs of polyaniline, and achieve the effects of stabilizing electrochemical activity, increasing surface area, and bonding tightly

Inactive Publication Date: 2014-04-23
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 realizing stable electrochemical activity of polyaniline in neutral medium
  • Method for realizing stable electrochemical activity of polyaniline in neutral medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, a tungsten foil with a purity of 99.9%, a length of 40 mm, a width of 10 mm, and a thickness of 100 μm was taken and soaked in 2 wt% NaOH solution for 2 min to remove the natural oxide film on the surface of the tungsten foil. Then ultrasonically clean with ethanol and deionized water for 10 min respectively to remove oil-soluble and water-soluble impurities on the surface of tungsten foil. With tungsten foil as anode and graphite rod as cathode, 0.1 mol L -1 The perchloric acid aqueous solution was used as the electrolyte for constant voltage anodic oxidation, the oxidation voltage was 50V, the electrolyte temperature was 30°C, and the oxidation time was 10 min.

[0022] Anneal the prepared tungsten oxide in air, raise the temperature to 450°C and keep it for 3 hours, and finally cool down to room temperature naturally, and the heating rate is 20°C / min.

[0023] The annealed tungsten oxide was used as the working electrode, the graphite rod was used as the coun...

Embodiment 2

[0026] The purity, size, pretreatment and anodizing process of the tungsten foil are the same as in Example 1, and the anodizing time is changed to 5 min.

[0027] The annealing process of tungsten oxide, the aniline polymerization conditions and the cyclic voltammetry test method of the polyaniline film are the same as in Example 1. The results show that 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

[0029] The purity, size, pretreatment and anodizing process of the tungsten foil are the same as in Example 1, and the anodizing voltage is changed to 55V, and the oxidation time is set to 5 min.

[0030] The annealing process of tungsten oxide, the aniline polymerization conditions and the cyclic voltammetry test method of the polyaniline film are the same as in Example 1. The results show that 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 realizing stable electrochemical activity of polyaniline in a neutral medium. By adopting the method, stable electrochemical activity is realized for polyaniline in a neutral solution of which the pH is equal to 7.0. The method comprises the following steps: oxidizing a tungsten foil under a constant pressure by taking a 0.1 mol.L<-1> perchloric acid aqueous solution as electrolyte and adopting an anode oxidation method to obtain tungsten oxide, and annealing; performing electrochemical polymerization at room temperature by taking an aniline monomer-containing sulfuric acid aqueous solution as polymerization electrolyte and adopting cyclic voltammetry in a three-electrode system in which an annealed tungsten oxide electrode is taken as a working electrode, a graphite rod is taken as a counter electrode, and a saturated calomel electrode is taken as a reference electrode to prepare a polyaniline film; reacting polyaniline with the tungsten oxide to achieve stable electrochemical activity on the polyaniline film in the neutral medium. The polyaniline film can be applied to wider fields compared with ordinary polyaniline, such as biosensors, metal corrosion prevention and the like.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and relates to a method for making conductive polyaniline have stable electrochemical activity in a neutral medium. Background technique [0002] Polyaniline is a conductive polymer material with good application prospects. It has excellent environmental stability, reversible redox, and electrochromic properties. It has been widely used in sensors, energy storage components, and electrochromic devices. [0003] However, due to the unique proton-acid doping mechanism of polyaniline, it will gradually undergo a deprotonation process when the pH value increases, resulting in the loss of electrical conductivity and electrochemical activity. Under acidic conditions, three pairs of redox peaks generally appear on the cyclic voltammetry curve of polyaniline, indicating that polyaniline has good electrochemical activity under such conditions. As the pH value increased, its electrochemical activi...

Claims

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Application Information

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IPC IPC(8): C25D11/26C25D13/08C08G73/02
Inventor 吕惠玲杨春艳宋晔朱绪飞
Owner NANJING UNIV OF SCI & TECH
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