Novel carbon paste electrode and preparation method thereof

A carbon paste electrode and a new technology, applied in the field of electrochemical analysis, can solve problems such as poor performance of carbon paste electrode, and achieve the effects of improved electrochemical performance, improved mechanical performance, and improved long-term stability

Inactive Publication Date: 2010-05-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the disadvantages of the poor performance of the carbon paste electrode in the prior art, and prov

Method used

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  • Novel carbon paste electrode and preparation method thereof
  • Novel carbon paste electrode and preparation method thereof
  • Novel carbon paste electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] A new type of carbon paste electrode, which includes a glass tube 1 as an electrode sleeve, a lead wire 3, and a carbon paste 2 filled in the glass tube; the carbon paste 2 is formed by mixing graphite powder and triphenylamine, graphite The mass ratio of powder and triphenylamine is 7:3, the inner diameter of the glass tube is 1.8 mm, and the lead wire is copper wire. The electrode sleeve can also be a hollow tube made of polymer material.

[0020] The preparation method of the carbon paste electrode based on this ratio is as follows: Weigh 0.70g of graphite powder and 0.30g of triphenylamine and mix thoroughly, stuff it into the glass tube 1 and compact it, then heat it in an oven for 3 minutes, and the temperature is controlled at 125 ℃~130℃, after the conductive carbon material and triphenylamine are bonded together, take it out and cool it at room temperature for half an hour. As a comparison, a carbon paste electrode of the same composition was prepared without t...

Embodiment 2

[0028] In this embodiment, the carbon paste is prepared by thoroughly mixing 0.60 g of graphite powder and 0.40 g of triphenylamine, and the remaining is the same as the new carbon paste electrode described in Example 1, and the preparation method is also the same.

[0029] refer to Figure 6 For line b, the carbon paste electrode was placed in 1mM potassium ferricyanide and 0.1M potassium chloride solution, and the cyclic voltammetry scan was performed in the potential range of -0.1V-+0.6V. Obvious redox peaks can be obtained, and the peak potential difference is very small.

example 3

[0031] In this embodiment, the carbon paste is prepared by fully mixing 0.50 g of graphite powder and 0.50 g of triphenylamine, and the remaining is the same as the new carbon paste electrode described in Example 1, and the preparation method is also the same.

[0032] refer to Figure 6 For line c, the prepared carbon paste electrode was placed in 1mM potassium ferricyanide and 0.1M potassium chloride solution, and the cyclic voltammetry scan was performed in the potential range of -0.1V-+0.6V. Obvious redox peaks can be obtained, and the peak potential difference is very small.

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Abstract

The invention provides a novel carbon paste electrode, which can greatly improve the performances of the carbon paste electrode such as electrical conductivity, electrochemical activity, stability and the like. A carbon paste of the novel carbon paste electrode is made of carbon material powder which is agglutinated by triphenylamine. The carbon paste can greatly improve the electrical conductivity and the electron transfer rate of the electrode, and simultaneously can improve the stability of the electrode. The invention also provides a method for preparing the novel electrode, which comprises the following steps of: mixing a conducting carbon material with the triphenylamine, and then sufficiently grinding and mixing the mixture; stuffing the even mixture into a clean electrode sleeve, compacting the mixture, and inserting a conducting wire in the rear part of the mixture to prepared a semi-finished product of the electrode; and heating the prepared semi-finished product in a baking oven, and when the conducting carbon material is combined with the triphenylamine, cooling the mixture at the normal temperature. The electrode prepared by the method enhances the responses to potassium ferricyanide and dopamine. The mechanical properties and the long-term stability of the electrode are also greatly improved. The electrode has the advantages of simple manufacturing, simple and convenient operation, good repeatability and low cost.

Description

technical field [0001] The invention belongs to electrochemical analysis, and relates to a novel electrode and a preparation method thereof. Background technique [0002] Carbon paste electrode is a type of electrode made by mixing conductive carbon materials, such as graphite powder, with a hydrophobic binder to form a paste, which is then coated on the surface of the electrode rod or filled into the electrode tube. . Carbon paste electrodes have been widely used in electrochemical analysis, biosensor preparation, and environmental monitoring due to their non-toxicity, wide electrochemical window, simple fabrication, low cost, and easy surface renewal. However, carbon paste electrodes also have some disadvantages, such as poor electrical conductivity, low sensitivity, and poor stability. To improve the performance of carbon paste electrodes, a large amount of scientific research has emerged. The most common method is to modify the electrode, but the use of modified elect...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 吴坚平建峰应义斌
Owner ZHEJIANG UNIV
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