A kind of activation method of silver electrode

An activation method and technology for silver electrodes, applied in the direction of electrodes, electrode shapes/types, electrolysis components, etc., can solve the problems of low surface area of ​​three-dimensional porous structures, low removal rate of miscellaneous metals, easy collapse of three-dimensional porous structures, etc. The effect of improving dechlorination activity and high removal rate

Active Publication Date: 2020-12-25
ZHEJIANG UNIV OF TECH
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AI Technical Summary

Problems solved by technology

The disadvantages of this type of method are: low removal rate of foreign metals accumulated on the surface of the silver electrode during reductive dechlorination and low surface area of ​​the three-dimensional porous structure recast on the surface of the silver electrode
This type of method solves the problem of low surface area of ​​the recast three-dimensional porous structure on the surface of the silver electrode, but there are still problems such as low removal rate of foreign metals accumulated on the surface of the silver electrode during the reductive dechlorination process and easy collapse of the recast three-dimensional porous structure.

Method used

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  • A kind of activation method of silver electrode
  • A kind of activation method of silver electrode
  • A kind of activation method of silver electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: the activation method of bright silver electrode

[0034] (1) Redox of acid solution: in H-type cationic membrane electrolyzer with Nafion 117 cationic membrane (such as figure 1Shown), bright silver sheet (purity is 99.9wt%, size is 0.1cm * 2.0cm * 2.0cm) is working electrode; Platinum sheet of the same area is counter electrode; Silver / silver chloride is reference electrode. The working electrode chamber is a 10wt% hydrochloric acid aqueous solution (referred to as 1# electrolyte), and the counter electrode chamber is a 1.0mol / L sodium hydroxide aqueous solution. Control the temperature of the aqueous hydrochloric acid solution at 20-25°C, first apply a current density of 0.5A / dm to the silver electrode 2 The anodizing current until the electrode potential reaches +0.7vs.SHE; then reverse the current (with the silver sheet as the counter electrode and the platinum sheet as the working electrode), and apply a current density of 0.5A / dm to the silver elec...

Embodiment 2-7

[0037] According to the method of embodiment 1, change 1# electrolytic solution and 2# electrolytic solution in embodiment 1, redox current density, redox cut-off potential and reaction temperature into table 1, and the activated silver roughness prepared is shown in table 1 .

[0038] Table 1 Experimental parameters and activated silver electrode roughness

[0039]

Embodiment 8

[0044] Embodiment 8: the electrochemical dechlorination of dichloromethane (silver electrode is not activated in the middle of the batch reaction)

[0045] Sealed diaphragmless electrolyzers with air pockets (e.g. figure 2 Shown), the activated silver electrode (geometric dimension is 0.1cm * 2.0cm * 2.0cm, purity is 99.9wt%) prepared by the method described in Example 1 is the negative electrode, and the magnesium plate of the same area (geometric dimension is 0.3cm ×2.0cm×2.0cm) is the anode; 50mL of acetonitrile solution containing 0.1mol / L tetrabutylammonium perchlorate+5wt% acetic acid+20mmol / L dichloromethane is the electrolyte. At 25-30°C, feed 1A / dm 2 After 4 hours of reaction, the electrolysis was stopped. The yield of methane determined by gas chromatography is: 98%; the conversion rate of dichloromethane is 100%.

[0046] After repeating the above-mentioned electrochemical dechlorination process of dichloromethane 5 times, the roughness of the activated silver e...

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Abstract

The invention discloses a method for activating a silver electrode. The method is as follows: (1) using a diaphragm electrolyzer, using platinum as a counter electrode, silver as a working electrode, silver / silver chloride as a reference electrode, and hydrochloric acid The aqueous solution is the working electrode solution, and the alkali metal hydroxide aqueous solution is used as the counter electrode solution. 2 Carry out an oxidation reaction under the same conditions, and then reverse the current to carry out a reduction reaction; (2) replace the working electrode solution in step (1) with an aqueous alkali metal hydroxide solution, and carry out a redox reaction under other conditions to obtain an activated silver electrode. The three-dimensional porous structure recast on the surface of the activated silver electrode of the present invention has larger surface area and stable structure, which can greatly improve the dechlorination activity and stability of the silver electrode, and is beneficial to the dechlorination selectivity of dichloromethane and toxidine.

Description

[0001] (1) Technical field [0002] The invention relates to an activation method of a silver electrode. [0003] (2) Background technology [0004] Silver electrodes have good electrocatalytic activity for the reductive dechlorination of chlorinated organic compounds, but this good electrocatalytic activity of silver electrodes requires periodic activation treatment to maintain. The activation treatment has two main purposes: (1) to remove the miscellaneous metals accumulated on the surface of the silver electrode during the reductive dechlorination process; (2) to recast the three-dimensional porous structure of the silver electrode surface that collapsed during the reductive dechlorination process. [0005] 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 orde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/08C25B11/03C25B3/04C25B3/25
CPCC25B11/04C25B11/03C25B3/25
Inventor 徐颖华李斌储诚普张小勇毛浙川
Owner ZHEJIANG UNIV OF TECH
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