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Method for preparing active silver electrode

A silver electrode, active technology, applied in electrodes, electrolysis process, electrolysis components, etc., to achieve the effects of low energy consumption, low loss, and large specific surface area

Inactive Publication Date: 2008-08-06
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The active silver electrodes prepared by the above methods have high electrocatalytic activity for the reduction and dehalogenation of halogenated organic compounds, but the catalytic activity potential of silver electrodes needs to be further explored, such as: how to prolong the life of active silver electrodes, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: the preparation of sheet-like activated silver electrode

[0025] In the diaphragmless electrolytic cell, a bright silver sheet is used as the working electrode, with an apparent size of 0.1cm×1.0cm×1.0cm, and graphite with the same area is used as the counter electrode, and the two electrodes are separated by 1cm. The electrolyte is 100mL aqueous solution containing 0.5mol / L perchlorate ion, 0.5mol / L hydroxide ion and 0.5mol / L nitrate ion (the cation is Na + ), the electrolyte remains static. Then the silver electrode is oxidized by direct current, the current density is 5mA / cm 2 , after the electrode potential rises to 0.9V, the polarity is reversed to reduce the silver electrode, and the current density is 10mA / cm 2 , until the electrode potential dropped to -0.8V, repeat this electrochemical redox process 4 times. The reaction temperature is controlled at 25°C, and the cell voltage is controlled at 2.5-4.0V. Take out the silver electrode and place ...

Embodiment 2

[0026] Embodiment 2: the preparation of screen type activated silver electrode

[0027]In the non-diaphragm electrolyzer, the screen-type silver is used as the working electrode, the apparent size is 0.1cm×10cm×10cm, the graphite with the same area is the counter electrode, and the two electrodes are separated by 2cm. The electrolyte is 1000mL aqueous solution containing 0.5mol / L perchlorate ion, 0.5mol / L hydroxide ion and 0.5mol / L nitrate ion (the cation is Na + ), the electrolyte remains static. Then the silver electrode is oxidized by direct current, the current density is 50mA / cm 2 , after the electrode potential rises to 1.0V, the polarity is reversed to reduce the silver electrode, and the current density is 100mA / cm 2 , after the electrode potential dropped to -0.8V, repeat this electrochemical redox process 4 times. The reaction temperature is controlled at 25°C, and the cell voltage is controlled at 2.5-4.0V. Take out the silver electrode and place it in a deioniz...

Embodiment 3～24

[0028] Embodiment 3~24: the preparation of sheet-like activated silver electrode

[0029] In the diaphragmless electrolytic cell, a bright silver sheet is used as the working electrode, with an apparent size of 0.1cm×1.0cm×1.0cm, and graphite with the same area is used as the counter electrode, and the two electrodes are separated by 1cm. The electrolyte is 100mL aqueous solution containing 0.5mol / L perchlorate ion, 0.05mol / L fluoride ion and 0.5mol / L hydroxide ion (cation is sodium ion), and the electrolyte remains static. Then the silver electrode is oxidized by direct current, the current density is 5mA / cm 2 , after the electrode potential rises to 0.9V, the polarity is reversed to reduce the silver electrode, and the current density is 10mA / cm 2 , until the electrode potential dropped to -0.8V, repeat this electrochemical redox process 4 times. The reaction temperature is controlled at 25°C, and the cell voltage is controlled at 2.5-4.0V. Take out the silver electrode a...

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Abstract

The invention provides a method for preparing an active silver electrode, the method comprises the following steps: firstly, carrying out anode oxidation reaction to the silver electrode to form a silver oxidation state layer on the surface of the silver electrode in water solution with anion,, secondly, changing polarity of the silver electrode, and carrying out cathode oxidation reaction to cathode of the silver electrode to obtain the active silver electrode, wherein anion is compounded by one, or two, or more than two following ions, namely, (1) perchlorate ion, (2) hypochlorous acid ion, (3) hydroxide ion, (4) nitrate ion, (5) sulfate ion, (6) carbonate ion, (7) halide ion, (8) organic acid ion and (9) phenol hydroxyl root ion, the active silver electrode which is obtained according to the method of the invention is not only provided with a more specific surface, but also provided with higher electro-catalysis activity, longer electro-catalysis performance and less power loss, and the obtained active silver electrode can be used to electrolyze 3,4,5,6-tetrachloropicolinic acid and to compound 3,6-dichloropicolinic, which not only has lower energy consumption, but also has higher production efficiency.

Description

(1) Technical field [0001] The invention relates to a preparation method of an active silver electrode. (2) Background technology [0002] Silver cathodes have good electrocatalytic activity for the reductive dehalogenation of halogenated organic compounds, and such good electrocatalytic activity of silver cathodes usually requires periodic activation treatment to maintain. The commonly used activation treatment processes are as follows: ① Place the silver electrode in alkaline aqueous solution, first anodize the electrode to form colloidal silver oxide on the surface, and then reverse the polarity to completely reduce the electrode, in order to obtain better To activate the effect, this process usually needs to be repeated several times. ② Put a small amount of silver salt (such as silver nitrate) into the alkaline aqueous solution, stir well to distribute the formed silver oxide particles evenly on the electrode, and then energize to completely reduce the silver oxide par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04C25B3/04C25B3/25
Inventor 马淳安徐颖华
Owner ZHEJIANG UNIV OF TECH
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