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Carbon electrode surface function alizing method

A carbon electrode and functionalization technology, applied in the functionalization field of carbon electrode surface, can solve the problems of contamination of electrode surface, high technical requirements, inconvenient operation, etc.

Inactive Publication Date: 2006-10-25
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical requirements of this method are relatively high, and the organic solvent and supporting electrolyte must be further anhydrous treatment before functionalization, which is extremely inconvenient to operate, and the organic solvent may contaminate the electrode surface, and the cost is relatively high

Method used

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  • Carbon electrode surface function alizing method

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Experimental program
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Effect test

Embodiment 1

[0012] 4-aminobenzoic acid modified glassy carbon electrode. Put a clean glassy carbon electrode into a 100mM 4-aminobenzoic acid aqueous solution with a molar concentration of 0.1M as the supporting electrolyte with potassium chloride. Use Ag / AgCl as the reference electrode, within the potential range of 0.5 ~ 1.1V, with 10mV s -1 Cycle potential scans for 30 min at sweep rate. The electrode was taken out and rinsed, and then ultrasonically cleaned with water to obtain a 4-aminobenzoic acid monolayer film-modified electrode. The cyclic voltammetry potential scan is shown in Figure 1.

Embodiment 2

[0014] 4-aminobenzoic acid modified carbon fiber electrodes. Put the clean carbon fiber electrode into 1mM 4-aminobenzoic acid aqueous solution with a molar concentration of 0.1M potassium chloride as a supporting electrolyte. Use Ag / AgCl as the reference electrode, within the potential range of 0.5 ~ 1.1V, with 50mV s -1 The sweep rate of the cyclic potential scan was 5 min. The electrode was taken out and rinsed, and then ultrasonically cleaned with water to obtain a 4-aminobenzoic acid monolayer film-modified electrode.

Embodiment 3

[0016] 4-aminobenzoic acid modified graphite electrode. Put the clean pyrolytic graphite electrode into the molar concentration of 50mM 4-aminobenzoic acid aqueous solution, potassium chloride is used as supporting electrolyte, and its molar concentration is 0.1M. Use Ag / AgCl as the reference electrode, within the potential range of 0.5 ~ 1.1V, with 100mV s -1 The sweep rate of the cyclic potential scan was 20 min. The electrode was taken out and rinsed, and then ultrasonically cleaned with water to obtain a 4-aminobenzoic acid monolayer film-modified electrode.

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Abstract

The invention provides a method for functionalizing the surface of a carbon electrode. Dissolving 4-aminobenzoic acid into an aqueous solution, adding a supporting electrolyte, placing the electrode in the electrolyte to perform cyclic voltammetry scanning, obtains an aminated carbon electrode. Due to the mild reaction conditions, 4-aminobenzoic acid is covalently linked to the electrode surface and fixed on the electrode surface in the form of a monolayer. The monolayer film structure is uniform, the reproducibility is good, and the stability is better than that of the modified gold electrode.

Description

technical field [0001] The invention belongs to a method for functionalizing the surface of a carbon electrode, that is, 4-aminobenzoic acid in an aqueous solution is directly covalently modified to the surface of a carbon electrode under electro-oxidation. Background technique [0002] Since the advent of chemically modified electrodes in 1975, it has been an active research field in electrochemistry and electroanalytical chemistry. People pay great attention to the functionalization of the electrode surface. For carbon electrodes, because it has a wider potential window and a more negative hydrogen evolution potential than noble metals such as Pd, Ag, and Au, its surface modification has become a priority for electrochemical workers. research focus. [0003] [J.Y.Liu, L.Cheng, B.F.Liu, and S.J.Dong, Langmuir, 2000, 16, 7471; J.Y.Liu, B.F.Liu, and S.J.Dong, Electroanalysis, 2001, 13, 993] etc. disclosed a Carry out the functionalization method of carbon surface in organic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
Inventor 董绍俊杨国程申燕刘柏峰
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI