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PVDF (polyvinylidene fluoride) modified perfluorosulfonate proton exchange membrane and preparation method thereof

A technology of proton exchange membrane and perfluorosulfonic acid, which is applied in the field of perfluorosulfonic acid proton exchange membrane and its preparation, can solve the problem of decreased proton conductivity of composite proton exchange membrane, difficult scale, industrial production, and complex steps and other issues, to achieve a good industrial production basis, easy to batch, and improve the effect of selectivity

Inactive Publication Date: 2015-04-29
FUDAN UNIV
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Problems solved by technology

[0004] However, the simple blending method often reduces the proton conductivity of the composite proton exchange membrane; while the chemical / irradiation crosslinking and special structure design methods have complicated steps in the actual operation process and are difficult to scale and industrialize production

Method used

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  • PVDF (polyvinylidene fluoride) modified perfluorosulfonate proton exchange membrane and preparation method thereof
  • PVDF (polyvinylidene fluoride) modified perfluorosulfonate proton exchange membrane and preparation method thereof

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Embodiment 1

[0024] 1. Take 4 ml of commercially available Nafion TM Solution, remove more than half of the solvent by rotary evaporation, then add 3 ml N,N-dimethylformamide, and continue rotary evaporation for 10 min. To the above Nafion TM Add 60 mg PVDF to the solution and sonicate for 1 hour to make it uniformly dispersed;

[0025] 2. Subsequently, add 600 ml of commercially available ammonia solution to the above mixed solution, and then ultrasonically mix it evenly;

[0026] 3. Next, carefully pour the dispersion into the mold and quickly place it at 70 o In C oven, start from 70 °C for 2 h and then slowly increase the temperature to 120 °C to remove the solvent; vacuumize, set the temperature of the vacuum oven at 120 °C and keep it for 16 h;

[0027] 4. Finally, the membrane was first treated with 3 wt% H 2 o 2 solution at 70 o C for 2 h, followed by 1 M H 2 SO 4 Convert the membrane to H at 80 °C for 1 h + type, and finally PVDF modified Nafion can be obtained TM proton...

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Abstract

The invention belongs to the technical field of membranes and particularly relates to a PVDF (polyvinylidene fluoride) modified perfluorosulfonate proton exchange membrane and a preparation method thereof. PVDF is compounded with a perfluorosulfonate proton exchange membrane uniformly through the crosslinking of ammonia to prepare the PVDF modified perfluorosulfonate proton exchange membrane. The membrane permeability of the obtained PVDF modified perfluorosulfonate proton exchange membrane is reduced greatly compared with that of the perfluorosulfonate proton exchange membrane, and the membrane permeability of the PVDF modified perfluorosulfonate proton exchange membrane is reduced manyfold under the harsh conditions of high temperature and / or high concentration of methanol. In addition, the proton conductivity of the PVDF modified perfluorosulfonate proton exchange membrane is increased slightly under the same condition, and the mechanical stability and the dimensional stability of the compound proton exchange membrane are improved greatly. The preparation method disclosed by the invention has the advantages of simple operation process, mild preparation condition and extremely low production cost, is suitable for batch production and scale production and has good industrial production basis and broad application prospect.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a perfluorosulfonic acid proton exchange membrane and a preparation method thereof. Background technique [0002] With its high conversion rate and no pollution, fuel cells have become the most competitive alternative power source in the field of internal combustion engine power. Especially the direct methanol fuel cell, which is called the sixth-generation fuel cell, has attracted great attention from many aspects such as industry and academia. The proton exchange membrane is one of its core components, which is responsible for providing channels for the migration and transport of protons and blocking fuel. Therefore, its comprehensive performance is crucial for the development of high-performance direct methanol fuel cells. An ideal proton exchange membrane should only allow (hydrated) protons to migrate and transport in its membrane matrix, while effectively pr...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08J7/12C08J7/14C08J7/00C08L27/16C08K5/17
Inventor 冯凯汤蓓蓓武培怡
Owner FUDAN UNIV
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