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Method for keeping stable electrochemical activity of polyaniline in neutral medium

A neutral medium, electrochemical technology, applied in the field of electrochemistry, can solve the problems of unsatisfactory polyaniline, unsatisfactory electrochemical activity and poor cycle stability of polyaniline.

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

However, the effect of maintaining electrochemical activity of polyaniline prepared by these methods in neutral solution is not ideal, especially the cycle stability is poor, which still cannot meet the requirements of practical application of polyaniline

Method used

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  • Method for keeping stable electrochemical activity of polyaniline in neutral medium
  • Method for keeping stable electrochemical activity of polyaniline in neutral medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, take a piece of FTO conductive glass with a length of 20 mm and a width of 10 mm, and ultrasonically clean it with ethanol for 10 min to remove oil-soluble impurities on the surface. In a two-electrode system with graphite rod as anode and FTO as cathode, with 0.2 mol L -1 The sodium tungstate aqueous solution is used as the electrolyte, and the constant current electrodeposition is carried out, and the current density is 0.5 mA / cm 2 , and the deposition time was 60 min to obtain a tungsten oxide film.

[0022] FTO with tungsten oxide deposited on the surface was used as the working electrode, a graphite rod as the counter electrode, and a saturated calomel electrode as the reference electrode. -1 0.5 mol L of aniline monomer -1 In sulfuric acid aqueous solution, polyaniline film was formed on the surface of tungsten oxide by electrochemical polymerization at room temperature, with a constant potential of 0.8V and a deposition time of 10 min.

[0023] The obta...

Embodiment 2

[0026] The FTO conductive glass size, pretreatment method, electrolyte and method for depositing tungsten oxide film are the same as in Example 1, depositing tungsten oxide for constant current electrodeposition, changing the current density to 0.75 mA / cm 2 , and the deposition time was 45 min to obtain a tungsten oxide film.

[0027] The preparation and electrochemical performance testing methods of the polyaniline membrane electrode are the same as in Example 1. The results show that after 100 cycles of continuous scanning, the electrode still has stable electrochemical activity, and the peak current and peak position are basically maintained compared with the first cycle. constant.

Embodiment 3

[0029] The FTO conductive glass size, pretreatment method, electrolyte and method for depositing tungsten oxide film are the same as in Example 1, depositing tungsten oxide for constant current electrodeposition, changing the current density to 1 mA / cm 2 , and the deposition time was 30 min to obtain a tungsten oxide film.

[0030] The preparation and electrochemical performance testing methods of the polyaniline membrane electrode are the same as in Example 1. The results show that after 100 cycles of continuous scanning, the electrode still has stable electrochemical activity, and the peak current and peak position are basically maintained compared with the first cycle. constant.

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Abstract

The invention discloses a method for keeping a stable electrochemical activity of polyaniline in a neutral medium. With the adoption of the method, the polyaniline has the stable electrochemical activity in a neutral solution with the pH (Potential of Hydrogen) of 7.0. In a two-electrode system which takes a graphite rod as an anode and tin oxide conductive glass (FTO) doped with fluorinions as a cathode, a 0.2mol.L sodium tungstate water solution is used as electrolyte to electrically deposit tungsten oxide on the surface of the cathode. In a three-electrode system which takes the FTO deposited with the tungsten oxide on the surface as a working electrode, the graphite rod as a pair electrode and a saturated mercurous chloride electrode as a reference electrode, the electrolyte is a sulfuric acid water solution containing an aniline monomer; electrochemical polymerization is carried out by using a constant-pressure method to prepare a polyaniline film. The prepared polyaniline film can keep the stable electrochemical activity in the neutral medium so that the application field of the polyaniline is greatly expanded.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and relates to a method for keeping polyaniline with stable electrochemical activity in a neutral medium. Background technique [0002] Polyaniline has excellent environmental stability, reversible redox properties, and unique electrochromic properties, and is widely used in sensors, light-emitting diodes, and electrochromic devices. [0003] However, due to the proton-acid doping mechanism of polyaniline, its oxidation-reduction process requires the participation of protons. Under strong acidic conditions, polyaniline has good electrochemical activity, and three pairs of obvious redox peaks can appear on its cyclic voltammetry curve. When the pH > 4, the oxidation-reduction electrochemical activity of polyaniline is basically lost, which greatly limits the application of polyaniline in neutral pH environments such as biosensors and marine antifouling and anticorrosion. [0004] For ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/54C25D9/08C25D13/08C08G73/02C08K3/22C08L79/02
Inventor 吕惠玲杨春艳宋晔朱绪飞
Owner NANJING UNIV OF SCI & TECH
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