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Intermediate-temperature proton exchange film of organic polysiloxane phosphonic acid group and preparation method thereof

A technology of polysiloxane phosphonic acid group and proton exchange membrane, which is applied in the direction of fuel cells, structural parts, fuel cell parts, etc., can solve the problems of poor mechanical strength and low electrical conductivity, and achieve long service life and flexibility Good resistance, the effect of improving flexibility

Inactive Publication Date: 2010-08-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The prepared proton exchange membrane has a pseudo-polyethylene glycol network structure, which can provide a channel for proton transfer for non-aqueous proton-conducting units. Form chemical bonds, so at medium temperature and low humidity, the medium temperature proton exchange membrane has disadvantages such as low conductivity and poor mechanical strength

Method used

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  • Intermediate-temperature proton exchange film of organic polysiloxane phosphonic acid group and preparation method thereof
  • Intermediate-temperature proton exchange film of organic polysiloxane phosphonic acid group and preparation method thereof

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preparation example Construction

[0032] The preparation method of the phosphonic acid ethyltrimethoxysilane used is: according to trimethoxy hydrogen siloxane: vinylphosphonic acid: platinum acetylacetonate: the mol ratio of methyl alcohol is 1.5: 1.5: 1.5 * 10 -3 : 20 Weigh the raw materials. Under the protection of nitrogen, add accurately measured trimethoxyhydrogensilane and platinum acetylacetonate into a pre-baked and dried three-necked flask equipped with electromagnetic stirring, irradiate under ultraviolet light, and stir for 10 minutes at the same time; Methanol was made into a solution, which was added dropwise to the reactor under the protection of nitrogen and cooled by a water bath at room temperature, and then continued to react for 1.0 hour; adding activated carbon, stirring for 10 minutes, filtering to remove the catalyst platinum acetylacetonate, and then rotating to remove the solvent to obtain Pale yellow transparent viscous liquid; obtained by vacuum drying at 130°C for 1.0 hour.

[0033...

Embodiment 1

[0037] The specific steps of the preparation method of organopolysiloxane phosphonic acid-based medium-temperature proton exchange membrane are as follows:

[0038] 1) Preparation of sol: according to the raw materials γ-(2,3-epoxypropoxy)propyltrimethoxysilane: 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane: ethyl phosphonate The molar ratio of trimethoxysilane is 1.0: 1.0: 1.5. Select the raw material and add it to the reactor, then add methanol with a molar ratio of 7.0 to GPTMS, then add deionized water with a molar ratio of 5.0 to GPTMS, and stir at room temperature for 24 hours, a stable and clear sol was obtained;

[0039] 2) Preparation of gel film: Pour the sol solution obtained in step 1) into a polytetrafluoroethylene mold plate, cover with aluminum foil, then put it into an oven, gelatinize at 65-70°C, that is, dehydration and dealcoholization for 12 hours, When the sol solution becomes viscous, remove the aluminum foil and continue to gel for 45 minutes to obtain a...

Embodiment 2

[0043] The specific steps of the preparation method of organopolysiloxane phosphonic acid-based medium-temperature proton exchange membrane are as follows:

[0044] 1) Preparation of sol: according to the raw materials γ-(2,3-epoxypropoxy)propyltrimethoxysilane: 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane: phosphonic acid benzene The molar ratio of ethyltriethoxysilane is 1.0:0.5:0.7, select the raw material, add it to the reactor, then add methanol with a molar ratio of 6.0 to GPTMS, then add deionized water with a molar ratio of 4.0 to GPTMS, room temperature After stirring for 18 hours, a stable and clear sol was obtained;

[0045] 2) Preparation of gel film: Pour the sol solution obtained in step 1) into a polytetrafluoroethylene mold, cover with aluminum foil, then put it into an oven, and gel (dehydration and dealcoholization) at 65-70°C for 24 hours , until the sol solution becomes viscous, remove the aluminum foil, and continue to gel for 50 minutes to obtain a gel f...

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Abstract

The invention relates to an intermediate-temperature proton exchange film of an organic polysiloxane phosphonic acid group and a preparation method thereof. The intermediate-temperature proton exchange film of the organic polysiloxane phosphonic acid group is characterized by being prepared by gamma-(2,3-epoxy propoxycaine) propyl trimethoxy silane, 2-(3,4-epoxy cyclohexyl) ethyltrimethoxy silane and phosphonic acid group alkoxy silane via a sol-gel process, and the molar ratio of the raw materials of the gamma-(2,3-epoxy propoxycaine) propyl trimethoxy silane, the 2-(3,4-epoxy cyclohexyl) ethyltrimethoxy silane and the phosphonic acid group alkoxy silane is 1:1:1.5 to 1:0.3:0.2. The intermediate-temperature proton exchange film has higher proton conductivity at intermediate temperature and low humidity, even can conduct the proton under the condition without water, and has good flexibility, high mechanical strength and long service life in an intermediate-temperature fuel cell.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a medium temperature proton exchange membrane for a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) will become an energy supply device closely related to human daily life because of its high efficiency and environmental protection. It will be the focus of people's research in the next few years or even a long period of time. As one of the key components of PEMFC, proton exchange membrane (PEM) has a great influence on the performance of PEMFC. [0003] At present, PEMFC generally uses Pt or Pt alloy as the catalyst, and uses perfluorosulfonic acid ion membrane (PFSI) as the exchange membrane. Perfluorosulfonic acid ion membrane (PFSI) has excellent performance when the working temperature is about 80°C, but in this temperature range, the Pt catalyst adsorbs more CO, which poisons the ...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M2/16H01M8/106
CPCY02E60/50
Inventor 沈春晖
Owner WUHAN UNIV OF TECH
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