PBI-based polysiloxane and phosphonic acid high-temperature proton exchange film and preparation method thereof

A polysiloxane phosphonic acid and proton exchange membrane technology, which is used in fuel cell parts, solid electrolyte fuel cells, fuel cells, etc., can solve the problem of low proton conductivity, hard and brittle membrane, and phosphonic acid exudation. and other problems, to achieve the effects of good durability, improved flexibility, and simple instrumentation

Inactive Publication Date: 2015-04-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, phosphonic acid-based proton exchange membranes have three disadvantages: phosphonic acid bleeds out during use, the membrane is hard and brittle, and the proton conductivity is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A PBI-based polysiloxane phosphonic acid high-temperature proton exchange membrane is obtained by the following preparation method:

[0027] 1) Preparation of polysiloxane phosphonic acid gel: according to the molar ratio of each raw material 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane (EHTMS):aminotrimethylenephosphonic acid (ATMP) 1:0.5 (EHTMS: 2.4631g, ATMP: 1.4193g), 20ml of DMAc weighed raw materials, slowly added EHTMS to DMAc, stirred while adding dropwise, after stirring evenly, slowly added ATMP, stirred at room temperature for 24 hours, and obtained a stable Clarifying gel.

[0028] 2) Preparation of PBI polymer solution: 0.2084 g of PBI was weighed and dissolved in 15 ml of DMAc to obtain a brownish yellow PBI polymer solution.

[0029] 3) Weigh according to the mass ratio of PBI polymer solution: polysiloxane phosphonic acid gel 5:95, stir the two until they are evenly mixed, pour the mixed solution into a polytetrafluoroethylene mold plate and put it in a...

Embodiment 2

[0032] A PBI-based polysiloxane phosphonic acid high-temperature proton exchange membrane is obtained by the following preparation method:

[0033] 1) Preparation of polysiloxane phosphonic acid gel: According to the molar ratio of each raw material EHTMS: ATMP: 1:0.5 (EHTMS: 1.23105g, ATMP: 0.7096g), DMAc 20ml weighs the raw material, and slowly adds it into DMAc EHTMS was added dropwise while stirring, after stirring evenly, ATMP was slowly added, and stirred at room temperature for 24 hours to obtain a stable and clear gel.

[0034] 2) Preparation of PBI polymer solution: 0.2199g of PBI was weighed and dissolved in 15ml of DMAc to obtain a brownish yellow PBI polymer solution.

[0035] 3) Weigh it according to the mass ratio of PBI polymer solution: polysiloxane phosphonic acid gel 10:90, stir the two until they are evenly mixed, pour the mixed solution into a polytetrafluoroethylene mold and put it in a vacuum drying oven, 80 ℃ for 48 hours to volatilize the solvent, and ...

Embodiment 3

[0038] A PBI-based polysiloxane phosphonic acid high-temperature proton exchange membrane is obtained by the following preparation method:

[0039] 1) Preparation of polysiloxane phosphonic acid gel: according to the molar ratio of each raw material EHTMS: ATMP: 1:0.5 (EHTMS: 0.6155g, ATMP: 0.3548g), weigh the raw materials in 20ml of DMAc, and slowly add to DMAc EHTMS was added dropwise while stirring. After stirring evenly, ATMP was slowly added, and stirred at room temperature for 24 hours to obtain a stable and clear gel.

[0040] 2) Preparation of PBI polymer solution: Weigh 0.3234g PBI and dissolve it in 15ml DMAc to obtain brownish yellow PBI polymer solution;

[0041]3) Weigh according to the mass ratio of PBI polymer solution: polysiloxane phosphonic acid gel 25:75, stir the two until they are evenly mixed, pour the mixed solution into a polytetrafluoroethylene mold plate and put it in a vacuum drying oven. Treat at 80° C. for 48 hours to volatilize the solvent, then...

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Abstract

The invention belongs to the technical field of fuel batteries, and relates to a PBI-based polysiloxane and phosphonic acid high-temperature proton exchange film and a preparation method thereof. The PBI-based polysiloxane and phosphonic acid high-temperature proton exchange film disclosed by the invention is prepared through the following method: dispersing polysiloxane and phosphonic acid in dimethylacetamide, and preparing to obtain a polysiloxane and phosphonic acid gel; then dissolving PBI in dimethylacetamide to obtain PBI polymer solution; then uniformly mixing the polysiloxane and phosphonic acid gel with the PBI polymer solution, then preparing by a tape-casting film-forming technique to obtain the PBI-based polysiloxane and phosphonic acid high-temperature proton exchange film. The doping amount of phosphonic acid is low and phosphonic acid is not liable to exude when the high-temperature proton exchange film prepared by the preparation method disclosed by the invention achieves a certain proton conductivity, and the high-temperature proton exchange film has a high proton conductivity under a high-temperature and low-humidity condition; moreover, the medium-temperature proton exchange film is good in flexibility, high in mechanical strength, and good in durability in a high-temperature fuel battery.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a PBI-based polysiloxane phosphonic acid high-temperature proton exchange membrane and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cells (PEMFC) have the advantages of high conversion efficiency, high energy density, fast start-up and environmental friendliness. It can not only be used to build distributed power stations, but also is particularly suitable as a mobile power source. It is a new type of mobile power source commonly used by the military and civilians, and it is also the best candidate power source for generating electricity using hydrogen, a by-product of chlor-alkali plants. Therefore, PEMFC has been developed rapidly and is considered to be one of the most promising clean energy conversion technologies, and has aroused the research interest of many scholars. The proton exchange membrane (PEM) is an important part of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/10H01M8/0221H01M8/1018
CPCH01M8/1041H01M8/1081Y02E60/50
Inventor 沈春晖李慧琳李伟尹珊珊
Owner WUHAN UNIV OF TECH
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