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Multilayer proton exchange membrane for water electrolysis and preparation method thereof

A proton exchange membrane, water electrolysis technology, applied in the electrolysis process, electrolysis components, organic diaphragms, etc., can solve the problems of poor proton conductivity, short life, performance degradation of the proton exchange membrane, etc., to achieve low price, low cost, and avoid deformation. Effect

Active Publication Date: 2022-03-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above technical problems, the purpose of this invention is to provide a multi-layer proton exchange membrane for water electrolysis and its preparation method, aiming to solve the problem of proton exchange from the membrane structure itself Poor proton conductivity of the membrane in the process of water electrolysis and short service life due to performance attenuation of the proton exchange membrane

Method used

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  • Multilayer proton exchange membrane for water electrolysis and preparation method thereof

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Effect test

Embodiment 1

[0033] (1) Weigh 50 g of long side chain perfluorosulfonic acid resin, add 225 mL of deionized water and 225 mL of isopropanol, and stir at room temperature for 20 h to obtain a long side chain perfluorosulfonic acid resin solution with a solubility of 10%;

[0034] (2) Weigh 1g side chain molecular structure as -OCF 2 CF 2 SO 3 For the short side chain perfluorosulfonic acid resin of H, add 99mL of deionized water, stir at room temperature for 50h, and obtain a short side chain perfluorosulfonic acid resin solution with a concentration of 1%.

[0035] (3) Install the release-type polyethylene terephthalate (PET) base film with a thickness of 5 μm in a continuous coating equipment, and then use a coating speed of 1 m / min, a coating wet thickness of 1000 μm, and a coating pressure of 0.1 Process parameters of bar Coat the long-side-chain perfluorosulfonic acid resin solution prepared in step (1) on the surface of the basement membrane, and dry it through oven A at 50°C to for...

Embodiment 2

[0042] (1) Weigh 200g of long side chain perfluorosulfonic acid resin, add 50mL of deionized water and 250mL of ethanol, stir at room temperature for 50h, and obtain a long side chain perfluorosulfonic acid resin solution with a solubility of 40%;

[0043] (2) Weigh 10g side chain molecular structure as -OCF 2 CF 2 CF 2 SO 3 For the short side chain perfluorosulfonic acid resin of H, add 990mL of ethanol and stir at room temperature for 20h to obtain a short side chain perfluorosulfonic acid resin solution with a concentration of 1%.

[0044] (3) Install a release-type polyethylene naphthalate (PEN) base film with a thickness of 50 μm in a continuous coating equipment, and then use a coating speed of 10 m / min, a coating wet thickness of 100 μm, and a coating pressure of 0.01 bar The process parameters of the long side chain perfluorosulfonic acid resin solution prepared in step (1) are coated on the surface of the basement membrane, and dried by drying tunnel A at 30°C to f...

Embodiment 3

[0051] (1) Weigh 100g of long side chain perfluorosulfonic acid resin, add 100mL of deionized water and 300mL of n-propanol, stir at room temperature for 40h, and obtain a solution of long side chain perfluorosulfonic acid resin with a solubility of 20%;

[0052] (2) Weigh 20g side chain molecular structure as -OCF 2 SO 3 For the short side chain perfluorosulfonic acid resin of H, add 380mL n-propanol, stir at room temperature for 40h, and obtain a concentration of 5% short side chain perfluorosulfonic acid resin solution;

[0053] (3) Install the release polyethylene film (PE) base film with a thickness of 20 μm in a continuous coating equipment, and then adopt the process parameters of coating speed 5m / min, coating wet thickness 500 μm, coating pressure 0.05bar (1) The long side chain perfluorosulfonic acid resin solution prepared is coated on the surface of the basement membrane, and dried by drying tunnel A at 40° C. to form a gel state long side chain perfluorosulfonic a...

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Abstract

The invention discloses a multi-layer proton exchange membrane for water electrolysis, the multi-layer proton exchange membrane comprises a five-layer structure which sequentially comprises a long side chain perfluorinated sulfonic acid resin layer, a short side chain perfluorinated sulfonic acid resin layer, a microporous layer, a short side chain perfluorinated sulfonic acid resin layer and a long side chain perfluorinated sulfonic acid resin layer, and the preparation method comprises the following steps: firstly, dissolving long side chain resin and short side chain resin to prepare a membrane casting solution; secondly, filling the long-side-chain perfluorinated sulfonic acid resin solution and the short-side-chain perfluorinated sulfonic acid resin solution into a coating die head for layered coating and film forming; laying a polytetrafluoroethylene microporous membrane again, and carrying out layered coating on the long and short side chain perfluorinated sulfonic acid resin solution to obtain a composite structure; and rolling and laminating the prepared composite layer II to obtain the multi-layer proton exchange membrane for water electrolysis. The proton exchange membrane disclosed by the invention is better in uniformity; the long side chain resin and the short side chain resin are alternated, so that high conductivity under low IEC can be realized, the proton exchange composite membrane has relatively good chemical stability, dimensional stability and relatively high conductivity, and the problems of poor proton conductivity and short service life in the operation process are solved.

Description

technical field [0001] The invention relates to a multilayer proton exchange membrane for water electrolysis and a preparation method thereof, belonging to the field of water electrolysis membrane materials. Background technique [0002] Hydrogen is regarded as the most ideal energy carrier due to its clean, pollution-free, efficient, storable and transportable advantages. Hydrogen production by electrolysis of water is currently the easiest way to obtain pure hydrogen. If it is combined with renewable resource power generation technologies, such as photovoltaic power generation, hydropower generation and wind power generation, electrolysis of water can be used as a large-scale hydrogen production technology, which will not pollute the environment Small, less greenhouse gas emissions, good economy, has a good application prospect. As the core component of the electrolyzed water system, the electrolyzer's investment and production costs determine the economy and technologica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B13/08C25B1/04C08J5/22C08L27/18
CPCC25B13/08C25B1/04C08J5/2237C08J2327/18C08J2427/18Y02E60/36Y02E60/50
Inventor 张洪杰郝金凯邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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