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A kind of preparation method of porous proton exchange composite membrane with nano sheet structure

A technology of proton exchange membranes and nanosheets, applied in the field of proton exchange membranes, can solve problems such as high cost, limited improvement of proton conductivity, and difficult design, and achieve enhanced mechanical properties, improved proton conductivity, and good compatibility Effect

Active Publication Date: 2020-12-29
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to improve the proton conductivity of this type of proton exchange membrane, this type of membrane can be modified. There are three main ideas: one is simply blending and doping some inorganic fillers, heteropolyacids, etc. (such as SiO 2 , graphene or phosphotungstic acid, silicotungstic acid, etc.), the hybrid membrane prepared by this method is conducive to improving its proton conductivity, but the improvement of proton conductivity is limited, and the membrane will become very brittle and mechanically stable. Not good; one is to modify the membrane material, such as introducing flexible groups (such as ether bonds), sulfonic acid groups or larger groups on the polymer main chain or side chain to strengthen the molecular chain of the polymer Flexibility and free volume, and then improve the proton conductivity of the membrane, but this method is more difficult to design, the experiment implementation is more complicated and cumbersome, and the cost is also higher; the other is to optimize the modification of the membrane structure, such as preparing porous proton Exchange membrane, or organic-inorganic composite membrane with multilayer structure

Method used

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  • A kind of preparation method of porous proton exchange composite membrane with nano sheet structure
  • A kind of preparation method of porous proton exchange composite membrane with nano sheet structure
  • A kind of preparation method of porous proton exchange composite membrane with nano sheet structure

Examples

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Effect test

Embodiment 1

[0040] 5×5cm 2 Immerse an aluminum sheet of large or small size in 400ml of 1wt% sodium hydroxide solution to remove the oxide film on the surface of the aluminum sheet, rinse it with deionized water, put it in 80°C deionized water, take it out after 10 minutes and dry it for later use; put 1g of polybenzimidazole Dissolve it in 9g of dimethylacetamide to make 10wt% polybenzimidazole casting solution; then scrape-coat the casting solution onto the surface of the aluminum sheet with nanosheet structure, and then immerse it in isopropyl Alcohol coagulation bath, rinse with deionized water subsequently and make the porous membrane that has aluminum flake, then above-mentioned porous membrane is soaked in the hydrochloric acid solution of 400ml 1wt% 2h corrodes aluminum flake, obtains the nano flake structure Porous membrane; another 0.2g polybenzimidazole was dissolved in 9.8g dimethylacetamide to make 2wt% polybenzimidazole casting solution; finally spin-coated on the surface of...

Embodiment 2

[0042] 5×5cm 2 Immerse aluminum flakes of different sizes in 400ml 1.5wt% sodium bicarbonate solution to remove the oxide film on the surface of the aluminum flakes, rinse with deionized water, put them in deionized water at 70°C, take them out after 30 minutes and dry them for later use; sulfonate 1.2g Polyimide is dissolved in 8.8g dimethylformamide, makes 12wt% sulfonated polyimide film-casting solution; Then this casting film solution is scraped and coated on the aluminum flake with nano sheet structure On the surface, immerse in water, then rinse with deionized water to make a porous membrane with aluminum flakes; soak the above porous membrane in 400ml of 1.5% sulfuric acid solution for 3h to corrode the aluminum flakes to make a porous membrane with nanostructures ; Another 0.5g polyimide is dissolved in 9.5g dimethyl sulfoxide to make a 5wt% polyimide casting solution; finally, a layer of spin coating with a nanosheet structure on the porous membrane surface 5wt% poly...

Embodiment 3

[0044] 5×5cm 2Immerse an aluminum sheet of a certain size in 400ml of 10wt% potassium hydroxide solution to remove the oxide film on the surface of the aluminum sheet, rinse it with deionized water, put it in 50°C deionized water, take it out after 40 minutes and dry it for later use; put 2g of sulfonated polyether Sulfone was dissolved in 8g of dimethylacetamide to make 20wt% sulfonated polyethersulfone casting solution; then the casting solution was scraped onto the surface of the aluminum sheet with nanosheet structure, immersed in acetone, Rinse with deionized water subsequently and make the porous membrane that has aluminum flake; Above-mentioned porous membrane is soaked in the sodium hydroxide solution of 400ml 5wt% 3h corrodes aluminum flake and makes the porous membrane with nano-sheet structure; Another Get 0.2g of sulfonated polyetheretherketone and dissolve it in 19.8g of dimethylformamide to make a 2wt% sulfonated polyetheretherketone casting solution; A layer of...

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Abstract

The invention relates to a preparation method for a porous proton exchange composite film with a nano laminated structure. The method comprises the following steps: an aluminum sheet is pretreated, and the aluminum sheet is immersed in hot water for a certain period of time to obtain the aluminum sheet with the nano laminated structure; a polymer casting film solution is scraped to a surface of the aluminum sheet with the nano laminated structure, a polymer porous film base film is obtained via a phase separation method, and the aluminum sheet is corroded after the base film is formed; a layerof polymer casting film solution is spin coated on a surface of a porous film with the nano laminated structure, and the porous proton exchange composite film with the nano laminated structure is obtained. Proton conductivity of the porous proton exchange composite film prepared in the invention is improved significantly due to introduction of the nano laminated structure, vanadium ion transmission of the overall composite film is remarkably lowered, and good chemical stability and mechanical properties are achieved.

Description

technical field [0001] The invention belongs to the field of proton exchange membranes, and in particular relates to a preparation method of a porous proton exchange composite membrane with a nano sheet structure. Background technique [0002] As we all know, in recent years, people's over-reliance on traditional fossil fuels has made environmental problems increasingly serious, and large-scale development and utilization of renewable energy is imminent. However, since renewable energy requires a certain scale of electrical energy storage devices to ensure a continuous and stable supply of electrical energy, the demand for large-scale energy storage systems is also increasing. Among them, the all-vanadium redox flow battery has attracted extensive attention due to its advantages of large capacity, high efficiency, and good operational reliability. [0003] The key components of all-vanadium redox flow batteries mainly include electrolyte, electrodes, proton exchange membran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1069H01M8/1067H01M8/1041
CPCH01M8/1041H01M8/1067H01M8/1069Y02E60/50
Inventor 王丽华王亚辉何敏丁黎明宋延林
Owner INST OF CHEM CHINESE ACAD OF SCI
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