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Gas diffusion electrode and preparation method thereof

A gas diffusion electrode and diffusion layer technology, applied in the direction of electrodes, electrode shape/type, electrolytic components, etc., can solve the problems of broken electrodes, high price, lifespan and electrode performance impact, and achieve improved corrosion resistance and conductivity , good corrosion resistance and electrical conductivity, and the effect of avoiding etching damage

Active Publication Date: 2010-06-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are relatively few studies on the application of gas diffusion electrodes in the chlor-alkali industry, mainly because: 1) the reaction environment of the chlor-alkali industry is extremely harsh, and the concentration of the alkali solution in the system is as high as 30%. If the carbon material with a low degree is directly grafted into the chlor-alkali industry, the traditional gas diffusion electrode will easily fall off from the electrode surface in an alkaline environment, breaking the structure of the electrode and causing the electrolyte to flow through the diffusion laminar flow. into the gas chamber
The gas diffusion electrode is easily etched, and the life and electrode performance are affected; 2) the gas diffusion electrode is used in the chlor-alkali industry, which is an oxygen reduction reaction under alkaline conditions, and the cathode catalyst of the usual fuel cell is platinum nanoparticles. Catalytic effect is not as good as silver nanoparticles, and it is expensive

Method used

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  • Gas diffusion electrode and preparation method thereof
  • Gas diffusion electrode and preparation method thereof
  • Gas diffusion electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] 1) Weigh 2g of graphitized carbon black and dissolve it in 200ml of isopropanol, then add 0.56ml of polytetrafluoroethylene emulsion (0.84g) with a mass fraction of 60%, stir evenly, and smear it on a 12cm*12cm silver-plated On the nickel foam, after drying at room temperature for 8 hours, press on a hot press at 1tf and 20°C for 60s to obtain diffusion layer 1 and current collector 2;

[0021] 2) buckle a silver-plated nickel mesh of 12cm*12cm on the current collector 2 as a support, and then press it on a hot press at 1tf and 20°C for 60s to complete the production of the support 3;

[0022] 3) the silver-carbon catalyst 1g and 0.75g acidified graphitized carbon black of silver loading rate 40% are dissolved in 100ml Virahol, then add 0.83ml mass fraction and be 60% polytetrafluoroethylene emulsion (1.25 g) After stirring evenly, apply it on the support body 3, dry it at room temperature for 8 hours, and press it on a hot press at 3tf and 360° C. for 60 seconds to obt...

Embodiment 2

[0024] 1) Weigh 1.4g of graphitized carbon black and dissolve it in 100ml of isopropanol, then add 0.17ml of polytetrafluoroethylene emulsion (0.26g) with a mass fraction of 60%, stir evenly, and smear it on a 12cm*12cm plated On silver nickel foam, after drying at room temperature for 7 hours, press on a hot press at 2tf and 20°C for 120s to obtain diffusion layer 1 and current collector 2;

[0025] 2) buckle a silver-plated nickel mesh of 12cm*12cm on the current collector 2 as a support, and then press it on a hot press at 2tf and 20°C for 120s to complete the production of the support 3;

[0026] 3) the silver-carbon catalyst 2g and 1.5g acidified graphitized carbon black of silver loading rate of 40% are dissolved in 200ml Virahol, then add 0.97ml mass fraction and be 60% polytetrafluoroethylene emulsion (1.46 g) After stirring evenly, spread it on the support body 3, dry it at room temperature for 7 hours, and press it on a hot press at 4tf, 370° C. for 120 seconds to ob...

Embodiment 3

[0028]1) Weigh 2.5g of graphitized carbon black and dissolve it in 300ml of isopropanol, then add 1.11ml of 60% polytetrafluoroethylene emulsion (1.67g) in parts by mass and stir evenly, then smear it on a 12cm*12cm silver-plated On the nickel foam, after drying at room temperature for 9 hours, press on a hot press at 3tf and 20°C for 240s to obtain diffusion layer 1 and current collector 2;

[0029] 2) Fasten a 12cm*12cm silver-plated nickel mesh as a support on the current collector 2, and then press it on a hot press at 3tf and 20°C for 240s to complete the production of the support 3;

[0030] 3) the silver-carbon catalyst 3g and 2.25g acidified graphitized carbon black of silver loading rate of 40% are dissolved in 400ml Virahol, then add 0.64ml mass fraction and be 60% polytetrafluoroethylene emulsion (0.97 g) After stirring evenly, spread it on the support body 3, dry it at room temperature for 9 hours, and press it on a hot press at 6tf and 380° C. for 240 seconds to o...

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Abstract

The invention provides a gas diffusion electrode and a preparation method thereof. The gas diffusion electrode in the invention is prepared by the following steps: (1) homogenating graphon, isopropanol and polytetrafluoroethylene emulsion, smearing on silver-plated foamed nickel, and cold moulding to obtain the diffusion layer and the current collector; (2) covering the support body silver-plated nickel net on the current collector and cold moulding; and (3) homogenating the silver-carbon catalyst, acidulated graphon, isopropanol and polytetrafluoroethylene emulsion, smearing on the support body and heat forming. The gas diffusion electrode provided by the invention has good corrosion resistance and electrical conductivity in alkali liquor, and long service life, and is suitable for electrolysis reaction in chlorine alkali industry.

Description

technical field [0001] The invention relates to a gas diffusion electrode suitable for chlor-alkali industry and a preparation method thereof. Background technique [0002] The caustic soda production processes in the world mainly include ionic membrane method, diaphragm method and mercury method, and a small amount of causticization method. At present, the ionic membrane method has successively replaced the mercury method, the diaphragm method, and the causticizing method, and has become the preferred method for caustic soda production. The ionic membrane method still uses the hydrogen evolution cathode (nickel mesh + active coating), and its electrolytic chemical reaction formula is: 2NaCl+2H 2 O→Cl 2 +2NaOH+H 2 , Its actual electrolysis voltage is 3.2V ~ 3.5V, which consumes a lot of energy. The gas diffusion electrode is used in the ion membrane electrolyzer to replace the currently used active cathode, and the cathode is a gas-liquid-solid three-phase electrode react...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B11/03C25B1/34
Inventor 王峰谭畅刘景军吉静
Owner BEIJING UNIV OF CHEM TECH
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