A kind of nafion-based composite proton exchange membrane containing cross-linked sulfonated poss, preparation method and application thereof

A proton exchange membrane and cross-linking technology, which is applied in fuel cell proton exchange membranes and polymer functional membranes, can solve the problems of poor dimensional stability and high methanol permeability of Nafion membrane, and achieve high alcohol barrier performance and enhanced methanol barrier performance , thermal stability and strong anti-oxidation ability

Active Publication Date: 2022-04-05
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is aimed at the deficiencies in the prior art, and proposes a method for preparing Nafion-based composite proton exchange membranes containing sulfonated POSS by thermal crosslinking in situ, so as to solve the problem of high methanol permeability and size of Nafion membranes. The problem of poor stability

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  • A kind of nafion-based composite proton exchange membrane containing cross-linked sulfonated poss, preparation method and application thereof
  • A kind of nafion-based composite proton exchange membrane containing cross-linked sulfonated poss, preparation method and application thereof
  • A kind of nafion-based composite proton exchange membrane containing cross-linked sulfonated poss, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0038] Example 1: Preparation of Nafion-based composite proton exchange membrane containing cross-linked sulfonated POSS

[0039] (1) In a round bottom flask, add 0.1226g of octavinyl cage silsesquioxane, 0.1426g of sodium 3-mercapto-1-propanesulfonate, first add 2.5mL of tetrahydrofuran and 4mL of dimethyl sulfoxide to dissolve the raw materials Disperse evenly and dissolve. Add 5.4 mg of photoinitiator benzoin dimethyl ether and dissolve. Then under magnetic stirring, ultraviolet light was irradiated to react for 2h. A large amount of precipitates were formed in the reaction, and THF in the solvent was removed by rotary evaporation at 50° C. for 40 minutes, and the obtained liquid was poured into 20 mL of absolute ethanol to precipitate precipitates. The obtained precipitate was filtered, washed and dried to obtain vinyl sulfonated siloxane. The reaction equation is as figure 1 .

[0040](2) Preparation of composite proton exchange membrane: first take 0.485g of Nafion...

Embodiment 2

[0041] Example 2: Preparation of Nafion-based composite proton exchange membrane containing cross-linked sulfonated POSS

[0042] (1) In a round bottom flask, add 1.0128g of octavinyl cage silsesquioxane, 1.1406g of sodium 3-mercapto-1-propanesulfonate, first add 20mL of tetrahydrofuran and 20mL of dimethyl sulfoxide to disperse the raw materials Dissolve evenly. Add 40mg of photoinitiator benzoin dimethyl ether and dissolve. Then under magnetic stirring, ultraviolet light was irradiated to react for 2h. A large amount of precipitates were formed in the reaction, and THF in the solvent was removed by rotary evaporation at 50° C. for 40 minutes, and the obtained liquid was poured into 120 mL of absolute ethanol to precipitate precipitates. The obtained precipitate was filtered, washed and dried to obtain vinyl sulfonated siloxane.

[0043] (2) Preparation of composite proton exchange membrane: first take 0.47g of Nafion 212 membrane, heat and dissolve it in about 1.5mL dimet...

Embodiment 3

[0044] Example 3: Preparation of Nafion-based composite proton exchange membrane containing cross-linked sulfonated POSS

[0045] (1) Preparation of vinyl sulfonated siloxane according to Example 2.

[0046] (2) Preparation of composite proton exchange membrane: First take 0.455g of Nafion 212 membrane, heat and dissolve it in about 1.5mL dimethyl sulfoxide, then take 0.045g of vinyl sulfonated siloxane, add it to Nafion solution, heat and stir, dissolve uniform. The obtained homogeneous solution was scraped on a glass plate with a liquid film thickness of about 1000 μm, and then heated and dried at 70°C to form a film. After the film was formed, it was transferred to an oven at 200°C and heated for crosslinking for 10 hours. The finally obtained composite membrane was soaked and acidified in 0.5 M sulfuric acid solution at 80°C for 12 h to obtain the final Nafion-based composite proton exchange membrane containing cross-linked sulfonated POSS, which was recorded as: X -Naf...

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Abstract

The invention discloses a Nafion-based composite proton exchange membrane containing cross-linked sulfonated POSS, a preparation method and an application thereof. The present invention takes Nafion as the substrate, and uses bifunctional cage silsesquioxane ( Vi ‑POSS‑SO 3 Na) is a performance-enhancing component; through solution blending, scraping coating and drying to form a film, and then heating and crosslinking. in the composite film Vi ‑POSS‑SO 3 Thermal crosslinking occurs between Na and in situ thermal crosslinking to form POSS‑SO 3 Na nanoblocks. After acidification treatment, the X ‑Nafion@POSS composite membrane. The preparation method of the invention is simple, and the raw materials are easy to obtain, but the performance of the composite proton exchange membrane is greatly improved, and the methanol permeability can be reduced by about 50% at the highest. Compared with Nafion recast film, it has high alcohol resistance, strong thermal stability and oxidation resistance, good mechanical properties and dimensional stability, and has broad application prospects in methanol fuel cells.

Description

technical field [0001] The invention belongs to the technical field of fuel cell proton exchange membranes and polymer functional membranes, and in particular relates to a Nafion-based composite proton exchange membrane containing cross-linked sulfonated POSS, a preparation method and application thereof. Background technique [0002] Methanol fuel cell is an important type of proton exchange membrane fuel cell. As a commercially mature proton exchange membrane, Nafion membrane has been widely used in hydrogen-oxygen fuel cells. However, the high methanol permeability of Nafion membrane will lead to the generation of mixed potential, which reduces the open circuit voltage and output power of methanol fuel cells and limits its application in methanol fuel cells. Therefore, it is of great significance to prepare proton exchange membranes with high proton conductivity and low methanol permeability. [0003] Cage polysilsesquioxane (POSS) is a compound with organic / inorganic p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1044H01M8/1069H01M8/1081H01M8/1088C08J5/22C08J7/14C08J7/12C08L27/18C08L83/08
CPCH01M8/1044H01M8/1081H01M8/1088H01M8/1069C08J5/2237C08J7/14C08J7/12C08J2327/18C08J2483/08Y02E60/50
Inventor 孟跃中李臻王拴紧肖敏韩东梅
Owner SUN YAT SEN UNIV
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