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Treatment method of silver electrode for ion chromatography ampere detection

An amperometric detection and ion chromatography technology, which is applied to the treatment field of silver electrodes for ion chromatography amperometric detection, can solve the problems of large difference in surface energy spatial distribution, reduced surface roughness of silver electrodes, and reduced surface area of ​​silver electrodes, etc. Stability and effective area, simple and efficient processing procedures, and the effect of improving the electrochemical detection area

Active Publication Date: 2020-03-27
JIAXING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1)Al 2 o 3 The polishing powder itself has a certain particle size distribution, and the surface of the silver electrode treated by it is often adsorbed with nano-scale inorganic particles or other organic matter, which is difficult to completely remove even after ultrasonic cleaning. Even though the apparent area is 2~3 times higher than the geometrical area, its real area has no substantial increase compared with the geometrical area, and may even be reduced due to serious surface contamination.
[0007] (2) Using Al 2 o 3 The surface of the silver electrode polished by polishing powder has good flatness and bright appearance, but the surface roughness of the polished silver electrode decreases, resulting in a decrease in the apparent area of ​​the silver electrode
[0008] (3) From the analysis of the microstructure, there will be more high-index surface atoms and highly active atoms at the edges and corners of the microcrystals on the surface of the mechanically polished electrode. The spatial distribution of the surface energy varies greatly, and the electrochemical activity is low Uniformity, the stability of silver electrode use will be affected

Method used

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  • Treatment method of silver electrode for ion chromatography ampere detection
  • Treatment method of silver electrode for ion chromatography ampere detection
  • Treatment method of silver electrode for ion chromatography ampere detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] (1) Use 2000, 3000, 5000 and 10000 mesh water sandpaper in sequence to perform 4 grinding processes on the surface of the silver electrode. The duration of each grinding process is 3 minutes. After each grinding process, the silver electrode is ultrasonicated at a temperature of 50 ° C. After cleaning for 5 minutes, the silver electrode after ultrasonic cleaning was placed in 8% HNO 3 solution, soak it at 28°C for 4 minutes and take it out.

[0085] (2) Put the silver electrode in the concentration of 0.08 mol / L Cu(NO 3 ) 2 solution, after soaking for 4 minutes, take it out, and then rinse the surface with deionized water to obtain the silver electrode after sensitization treatment.

[0086] (3) The silver electrode after the sensitization treatment was placed in AgNO with a concentration of 0.5 g / L 3 After soaking in the solution for 4 minutes, take it out, continue to use deionized water to wash the surface, and prepare a silver electrode for ion chromatography amp...

Embodiment 2

[0089] (1) Use 2000, 3000, 5000 and 10000 mesh water sandpaper to perform 4 grinding processes on the surface of the silver electrode in sequence. The duration of each grinding process is 4 minutes. After each grinding process, put the silver electrode at a temperature of 45 ° C. Ultrasonic cleaning for 6 minutes, and then the silver electrode after ultrasonic cleaning was placed in 9% HNO 3 solution, soak it at 29°C for 5 minutes and take it out.

[0090] (2) Put the silver electrode in the concentration of 0.09 mol / L Cu(NO 3 ) 2 solution, after soaking for 4 minutes, take it out, and then rinse the surface with deionized water to obtain the silver electrode after sensitization treatment.

[0091] (3) The silver electrode after the sensitization treatment was placed in AgNO with a concentration of 0.5 g / L 3 After soaking in the solution for 2 minutes, take it out, continue to use deionized water to wash the surface, and prepare a silver electrode for ion chromatography amp...

Embodiment 3

[0094] (1) Use 2000, 3000, 5000 and 10000 mesh water sandpaper to perform 4 grinding processes on the surface of the silver electrode in sequence. The duration of each grinding process is 4 minutes. After each grinding process, put the silver electrode at a temperature of 45 ° C. Ultrasonic cleaning for 7 minutes, and then the silver electrode after ultrasonic cleaning was placed in 8% HNO 3 solution, soak it at 29°C for 4 minutes and take it out.

[0095] (2) Put the silver electrode in the concentration of 0.10mol / L Cu(NO 3 ) 2 solution, after soaking for 5 minutes, take it out, and then rinse the surface with deionized water to obtain the silver electrode after sensitization treatment.

[0096] (3) The silver electrode after the sensitization treatment was placed in AgNO with a concentration of 1.0 g / L 3 After soaking in the solution for 2 minutes, take it out, continue to use deionized water to wash the surface, and prepare a silver electrode for ion chromatography ampe...

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Abstract

The invention discloses a treatment method of a silver electrode for ion chromatography ampere detection, and relates to the technical field of electrochemical detection. According to the treatment method of the silver electrode for the ion chromatography ampere detection which is provided in the invention, firstly, waterproof abrasive paper with different mesh numbers is adopted for polishing; anultra-thin sensitization copper layer is obtained on the polished silver electrode through underpotential deposition; then, an electroless deposition technology is used for further inducing formationand growth of silver crystals on the obtained ultrathin sensitization copper layer; and the surface of the treated silver electrode has a fine crystal structure of nanometer or submicron silver particles. According to the method, the apparent area of the silver electrode after mechanical polishing treatment is reduced; in order to solve the technical problems, the technical effects of increasingthe effective area of the surface of the silver electrode and enhancing the electrochemical activity of the silver electrode are achieved; and, in addition, the ultrathin sensitization copper layer provided by the invention is prepared from a high-concentration Cu(NO<3>)<2> solution, has the advantages of being stable and cleanable, and has a remarkable effect of inducing electroless silver deposition.

Description

technical field [0001] The invention relates to the technical field of electrochemical detection, in particular to a processing method for a silver electrode used in ion chromatography amperometric detection. Background technique [0002] The electrochemical amperometric detection technology uses the change of the electrical signal of the measured substance on the surface of the electrode under a certain excitation to realize the detection of the substance. It uses the oxidation-reduction characteristics of substances to determine the detection method of the concentration information of the substance to be measured by measuring the change of the electric current or the integrated electric quantity related to the concentration of the substance to be detected. For example, for the detection of organic compounds containing nitro, amino and other substances as well as inorganic anions and cations, electrochemical amperometric detection technology can be used. Electrochemical am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/30
Inventor 赵健伟于晓辉赵博儒孙志程娜
Owner JIAXING UNIV
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