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A kind of preparation method of ionic liquid modified carbon paste electrode

An ionic liquid, carbon paste electrode technology, applied in the direction of electrochemical variables of materials, material analysis by electromagnetic means, measurement devices, etc., can solve the problems of sensitivity and selectivity limitations, etc., achieve high electrochemical activity, simple preparation, easy The effect of widespread use

Active Publication Date: 2018-02-06
HAINAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the carbon paste electrode has the advantages of good stability and reproducibility, a wide range of applications, and a long service life, its sensitivity and selectivity are limited.

Method used

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  • A kind of preparation method of ionic liquid modified carbon paste electrode
  • A kind of preparation method of ionic liquid modified carbon paste electrode
  • A kind of preparation method of ionic liquid modified carbon paste electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 0.8 g of N-butyl-N-methylpiperidine hexafluorophosphate and graphite powder respectively, use a pipette to measure 250 µL of liquid paraffin and mix thoroughly, and grind 2-3 pieces in a clean mortar Hours; insert the polished thin copper wire into a clean glass tube with a length of about 5-6 cm and an inner diameter of about 4 mm, and fix it; put the mixture in the mortar into the glass tube, and then remove the Put an appropriate amount of cotton into the top of the tube, and compact the mixture in the tube with a cylindrical metal rod to obtain an ionic liquid modified carbon paste electrode; before use, polish it to a mirror surface on a polishing paper. According to the above method, the mass ratios of graphite powder and ionic liquid were 2:1, 3:1, and 1:2 modified carbon paste electrodes.

Embodiment 2

[0027] A scanning electron microscope was used to characterize ionic liquid modified carbon paste electrodes with different mass ratios. The electrode surface morphology was as figure 1 As shown, A, B, C, and D are the surface topography of the modified electrode when the mass ratio of graphite powder to ionic liquid is 1:1, 2:1, 3:1, and 1:2, respectively. It can be seen that the surface of the modified electrode with a mass ratio of 1:1 is the smoothest and smoothest.

Embodiment 3

[0029] The prepared ionic liquid modified carbon paste electrodes with different mass ratios were placed in a mixture of 1.0 mmol / L potassium ferricyanide and 0.1 mol / L potassium chloride for cyclic voltammetric scanning. Such as figure 2 As shown, the curves a to d represent the cyclic voltammetry curves when the mass ratio of graphite powder and ionic liquid is 1:1, 2:1, 3:1, and 1:2. It can be seen that when the mass ratio is 1:1 , The redox peak current value is the largest, that is, the electron transfer rate on the electrode surface is the fastest under this condition.

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Abstract

The invention discloses a preparation method of a novel ionic liquid modified carbon paste electrode prepared by mixing N-butyl-N-methylpiperidine hexafluorophosphate ionic liquid, graphite powder and liquid paraffin wax. The preparation method comprises the following steps: (1) sufficiently grinding the ionic liquid, the graphite powder and the liquid paraffin wax in a clean mortar at a certain mass ratio; (2) putting the mixture into a glass tube; taking an embedded copper wire as a lead wire, and compacting by using a cylindrical metal rod; (3) before utilization, sufficiently polishing on polishing paper until a mirror surface is formed; (4) carrying out characterization on a surface shape by adopting a scanning electron microscope; (5) carrying out a comparative research on electrochemical behaviors of the ionic liquid modified carbon paste electrode by taking potassium ferricyanide as an electrochemical probe.

Description

Technical field [0001] The invention relates to the field of preparation of chemically modified electrodes, in which the preparation method of ionic liquid modified carbon paste electrodes is explored. Background technique [0002] Ionic liquids have the advantages of high conductivity, wide electrochemical window, high thermal stability, high heat capacity and high thermal energy storage density, etc., which make it have obvious advantages in the fields of electrochemistry and electroanalytical chemistry, and its acidity and alkalinity are adjustable, Low volatility and good solubility make it have great application prospects in many directions of electrochemistry. [0003] Carbon paste electrode is a type of electrode made by mixing conductive graphite powder and hydrophobic binder to make a paste, and then coating it on an electrode rod or filling it into an electrode tube. Although carbon paste electrodes have the advantages of good stability and reproducibility, wide applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 孙伟闫丽君牛学良文作瑞王文成
Owner HAINAN NORMAL UNIV