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
CN101736360AActive Publication Date: 2010-06-16BEIJING UNIV OF CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING UNIV OF CHEM TECH
Publication Date
2010-06-16

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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.
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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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