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Composite organic phosphonic acid high-temperature proton exchange membrane for fuel cell and preparation method of composite organic phosphonic acid high-temperature proton exchange membrane

A technology of proton exchange membrane and organic phosphonic acid, which is applied in the direction of fuel cells, circuits, electrical components, etc., can solve the problems of complex membrane production process, affecting membrane dimensional stability, service life, and complex process

Active Publication Date: 2018-11-06
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the widely used high-temperature proton exchange membrane is PBI (polybenzimidazole) type proton exchange membrane. This membrane is used together with inorganic phosphoric acid, which has obvious disadvantages: (a) serious loss of inorganic phosphoric acid; (b) proton exchange membrane After soaking in inorganic phosphoric acid, the mechanical strength is greatly reduced, which seriously affects the dimensional stability and service life of the membrane.
For example: (1) organic phosphonic acid polymers are difficult to prepare and are not suitable for large-scale production; (2) the film-making process is complex, such as the products released by BASF, and the process is very complicated; (3) the electrical conductivity is relatively low; (4) ) The content of phosphonic acid cannot be accurately controlled, and it is difficult to control the conductivity; (5) The mechanical strength is not enough, etc.

Method used

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  • Composite organic phosphonic acid high-temperature proton exchange membrane for fuel cell and preparation method of composite organic phosphonic acid high-temperature proton exchange membrane
  • Composite organic phosphonic acid high-temperature proton exchange membrane for fuel cell and preparation method of composite organic phosphonic acid high-temperature proton exchange membrane
  • Composite organic phosphonic acid high-temperature proton exchange membrane for fuel cell and preparation method of composite organic phosphonic acid high-temperature proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] m-PBI and [2-[(4-vinylbenzyloxy)methyl]oxirane-vinylphosphonic acid bis(trimethylsilyl)ester] copolymer B 1 Preparation of composite membrane:

[0066]

[0067] (1) 2-[(4-vinylbenzyloxy)methyl]oxirane-vinylphosphonic acid bis(trimethylsilyl)ester copolymer B 1 (molar ratio 1:4) preparation:

[0068] Under nitrogen protection, 2-[(4-vinylbenzyloxy)methyl]oxirane (190.1mg, 1mmol) and vinylphosphonic acid bis(trimethylsilyl) were successively added to the three-necked reaction flask (757.2mg, 4mmol), deionized water (200mL) was used as solvent, and then a free radical chain initiator azobisisobutyronitrile (AIBN, 8.20mg, 0.05mmol) was added. Stir (mechanical stirring) and heat to 80°C for reaction. After reacting for 24h, the solution became viscous, the reaction was stopped, and it was cooled to room temperature. Pour the reaction solution into ethyl acetate, and keep stirring, there is solid precipitation, filter, and vacuum dry to obtain organic phosphonic acid c...

Embodiment 2

[0072] B 2 Preparation of composite membrane:

[0073]

[0074] (1) [2-[(4-vinylphenoxy)methyl]oxirane-allylphosphonic acid bis(triethylsilyl)ester]copolymer B 2 (Molar ratio 1:5) preparation:

[0075] Under the protection of nitrogen, 2-[(4-vinylphenoxy)methyl]oxirane (176.2mg, 1mmol) and allylphosphonic acid bis(triethylsilane) were successively added to the three-necked reaction flask. Ester (1752.9mg, 5mmol), deionized water (250mL) was used as solvent, and then a free radical chain initiator azobisisobutyronitrile (AIBN, 19.71mg, 0.12mmol) was added. Stir (mechanical stirring) and heat to 80°C for reaction. After reacting for 24h, the solution became viscous, the reaction was stopped, and it was cooled to room temperature. Pour the reaction solution into ethyl acetate, and keep stirring, there is solid precipitation, filter, and vacuum dry to obtain organic phosphonic acid copolymer B 2 .

[0076] (2) Py-PBI and Copolymer B 2 (Molar ratio 1:1) Preparation of com...

Embodiment 3

[0079] O-PBI and [2-[(2-vinylphenoxy)methyl]oxirane-1,1-vinyl diphosphonic acid tetramethyl ester] copolymer B 3 Preparation of composite membrane:

[0080]

[0081] (1) [2-[(2-vinylphenoxy)methyl]oxirane-1,1-vinyl diphosphonic acid tetramethyl ester] copolymer B 3 (Molar ratio 1:3) preparation:

[0082] Under the protection of nitrogen, 2-[(2-vinylphenoxy)methyl]oxirane (176.2mg, 1mmol) and tetramethyl 1,1-vinyldiphosphonate were successively added to the three-necked reaction flask (732.4mg, 3mmol), deionized water (200mL) was used as solvent, and then a free radical chain initiator azobisisobutyronitrile (AIBN, 13.1mg, 0.08mmol) was added. Stir (mechanical stirring) and heat to 80°C for reaction. After reacting for 24h, the solution became viscous, the reaction was stopped, and it was cooled to room temperature. Pour the reaction solution into ethyl acetate, and keep stirring, solids are precipitated, filtered, and vacuum-dried to obtain copolymer B 3

[0083] (2) ...

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Abstract

The invention provides a composite organic phosphonic acid high-temperature proton exchange membrane for a fuel cell and a preparation method of the composite organic phosphonic acid high-temperatureproton exchange membrane, in particular, the composite organic phosphonic acid high-temperature proton exchange membrane provided by the invention is characterized by taking a polybenzimidazole-type compound A and a neutral organic phosphonic acid copolymer B as raw materials and compositing the raw materials, wherein the molar ratio of A to B is nA:nB=1:(0.01-99.99). The high-temperature proton exchange membrane has the advantages that preparation of a polymer is easy, the membrane forming technology is simple, the organic phosphonic acid content and the proton conductivity are accurate and controllable, and the like; the preparation method is suitable for preparing the high-temperature proton exchange membrane with high electrical conductivity and good mechanical strength.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a composite organic phosphonic acid high-temperature proton exchange membrane for fuel cells and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an efficient and environment-friendly power generation device. It uses clean energy as fuel, and can directly and continuously convert the chemical energy of the fuel into electrical energy. Its power generation process does not involve combustion, so it is not limited by the Carnot cycle, the energy conversion rate is high, and its theoretical thermal efficiency can reach 86%, far exceeding the traditional heat engine (the thermal efficiency of the traditional heat engine is about 45%). At the same time, due to its advantages of high efficiency, low pollution, short construction time, good reliability and maintainability, it is very suitable for various purposes s...

Claims

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Application Information

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IPC IPC(8): H01M8/103H01M8/1041H01M8/1069
CPCH01M8/103H01M8/1041H01M8/1069Y02E60/50
Inventor 胡金波何正标李铃春陈佳孝祝传贺邓玲
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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