A kind of solid acid radical electrode based on doped polyaniline and preparation method thereof

A polyaniline and solid acid technology, which is applied in the field of electrochemical detection, can solve the problems that liquid membrane electrodes are not suitable for in-situ measurement, affect electrode stability, and are difficult to integrate electrodes, and achieve short measurement time, short response time, and easy volume. Effect

Inactive Publication Date: 2018-12-04
ZHEJIANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, this type of electrode is difficult to miniaturize and is not easy to integrate with other electrodes; and the internally charged electrolyte will diffuse through the sensitive membrane, resulting in a change in its concentration, resulting in signal drift and affecting the stability of the electrode
[0003] Due to the above reasons, liquid film electrodes are not suitable for in-situ measurements, especially for long-term monitoring of marine environments

Method used

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  • A kind of solid acid radical electrode based on doped polyaniline and preparation method thereof
  • A kind of solid acid radical electrode based on doped polyaniline and preparation method thereof
  • A kind of solid acid radical electrode based on doped polyaniline and preparation method thereof

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preparation example Construction

[0024] The steps of the preparation method of solid acid radical electrode based on doped polyaniline are as follows:

[0025] 1) The metal wire 1 with a length of 3 to 5 cm is first ultrasonically cleaned in an acetone solution to remove oil on the surface, then ultrasonically cleaned in 1 to 2M dilute hydrochloric acid to remove oxides, then ultrasonically cleaned with deionized water and dried ;

[0026] 2) Prepare a 0.5-1M aniline hydrochloride solution with a molar ratio of aniline and hydrochloric acid at a molar ratio of 1:1, or dissolve aniline hydrochloride flakes in deionized water to prepare a 0.5-1M aniline hydrochloride solution; The ChemStation uses cyclic voltammetry to electroplate a layer of polyaniline 2 on the surface of the metal wire 1. The scanning voltage is 0-0.5V, the scanning speed is 50mV / s, and the scanning cycle number is 5-20cls; the metal in the three-electrode system Wire 1 is the working electrode, the auxiliary electrode is the Pt electrode, and t...

Embodiment 1

[0030] 1) The gold wire 1 with a length of 3 cm is first ultrasonically cleaned in acetone solution to remove the surface oil, then ultrasonically cleaned in 1M dilute hydrochloric acid to remove oxides, and then ultrasonically cleaned with deionized water and dried;

[0031] 2) Add 4.66g of aniline and 50mL of 1M hydrochloric acid to a 100mL volumetric flask, add water to the score line to prepare a 0.5M hydrochloric acid aniline solution; use CHI760D electrochemical workstation to electroplate a layer of polyaniline on the surface of gold wire 1 by cyclic voltammetry 2; Among them, the scanning voltage is 0-0.5V, the scanning speed is 50mV / s, and the scanning cycle number is 20cls; in the three-electrode system, the gold wire 1 is the working electrode, the auxiliary electrode is the Pt electrode, and the reference electrode is commercial Ag / AgCl Electrode: After electroplating is completed, rinse the electrode with anhydrous alcohol to remove the aniline oligomer on the surface...

Embodiment 2

[0034] 1) The silver wire 1 with a length of 4 cm is first ultrasonically cleaned in an acetone solution to remove oil on the surface, then ultrasonically cleaned in 2M dilute hydrochloric acid to remove oxides, and then ultrasonically cleaned with deionized water and dried;

[0035] 2) Weigh 0.972g aniline hydrochloride flake solid and dissolve it in 15mL deionized water to prepare 0.5M aniline hydrochloride solution; electroplate a layer of polyaniline 2 on the surface of silver wire 1 by cyclic voltammetry through CHI760D electrochemical workstation; Among them, the scanning voltage is 0-0.5V, the scanning speed is 50mV / s, and the number of scanning cycles is 10cls; in the three-electrode system, the silver wire 1 is the working electrode, the auxiliary electrode is the Pt electrode, and the reference electrode is the commercial Ag / AgCl electrode; After completion, rinse the electrode with absolute alcohol to remove the aniline oligomer on the surface of the electrode, and wait...

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Abstract

The invention discloses a doped polyaniline based solid acid radical electrode and a preparation method thereof. The solid acid radical electrode comprises a metal wire, polyaniline and acid radical doped polyaniline, and the latter is an acid radical ion sensitive membrane. During preparation, a layer of polyaniline is firstly electroplated on the lower surface of the metal wire, and then by means of electrochemical action in an acid solution or salt solution, acid radical doped polyaniline can be formed. The doped polyaniline based solid acid radical electrode prepared by the method provided by the invention has the advantages of simple preparation, high mechanical strength, large toughness, high sensitivity, small volume, fast detection response, low detection lower limit, and long service life, etc. And the doped polyaniline based solid acid radical electrode can support the use of all solid-state reference electrodes, and is suitable for on-line detection and long-term in-situ monitoring of the content of acid radicals in seawater, aquaculture water and chemical water media.

Description

Technical field [0001] The invention relates to electrochemical detection technology, in particular to a solid acid radical electrode based on doped polyaniline and a preparation method thereof. Background technique [0002] The acid radical content in a water body is an important indicator of water quality monitoring, and it is also of great significance for the monitoring and research of the degree of eutrophication of the water body, the distribution of seawater nutrients, and industrial pollution. At present, in addition to the traditional spectrophotometric method of sampling and detecting acid radical content, the most widely used acid radical ion-selective electrode is a liquid membrane electrode with an internal reference electrode and an internal charging solution. However, this type of electrode is difficult to miniaturize and not easy to integrate with other electrodes; and the internally charged solution will diffuse through the sensitive membrane to cause its concent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/333
Inventor 叶瑛黄元凤张潇阚雅婷赵玥周一凡贾健君
Owner ZHEJIANG UNIV
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