Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Silver electrode activating method

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

Active Publication Date: 2019-11-19
ZHEJIANG UNIV OF TECH
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Silver electrode activating method
  • Silver electrode activating method
  • Silver electrode activating method

Examples

Experimental program
Comparison scheme
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 roughness of activated silver electrode

[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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a silver electrode activating method, which comprises: (1) carrying out an oxidation reaction at a temperature of 0-50 DEGC at a current density of 0.1-5 A / dm<2> in a separation membrane electrolytic cell by using platinum as a counter electrode, using silver as a working electrode, using silver / silver chloride as a reference electrode, using a hydrochloric acid aqueous solution as a working electrode solution and using an alkali metal hydroxide aqueous solution as a counter electrode solution, and then carrying out a reduction reaction by reversing the current; and (2)replacing the working electrode solution in the step (1) with an alkali metal hydroxide aqueous solution, and carrying out a redox reaction under other unchanged conditions to obtain an activated silver electrode. According to the present invention, the three-dimensional porous structure recast on the surface of the activated silver electrode has a larger surface area and a stable structure so asto greatly improve the dechlorination activity and the stability of the silver electrode; and with the method, the dechlorination selectivity of dichloromethane and picloram can be easily achieved.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com