Bis phosphonic acid functional organosilicon high temperature proton conductor and preparation method thereof

A proton conductor and functionalization technology, applied in the field of diphosphonic acid functionalized organosilicon high-temperature proton conductor and its preparation, can solve the problem of low proton conductance, achieve high conductivity, good reproducibility, and improve hydrolysis stability Effect

Inactive Publication Date: 2015-09-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, tests have shown that due to the use of monobasic phosphonic acid, the proton conductance of this proton exchange membrane is low, which is still an order of magnitude worse than the actual application level of fuel cells.

Method used

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  • Bis phosphonic acid functional organosilicon high temperature proton conductor and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of a hydrolytically stable diphosphoric acid functionalized organosilicon high-temperature proton conductor. The specific steps are as follows:

[0020] 1) Before the reaction, the molar ratio of tetrasodium hydroxyethylene diphosphonate: tetrahydrofuran: propyltrimethoxysilane isocyanate is 0.4:10:1.0, and the raw materials are weighed for later use;

[0021] 2) Add tetrasodium hydroxyethylidene diphosphonate and solvent tetrahydrofuran into a four-neck flask equipped with a stirrer, thermometer, reflux condenser, and dropping funnel, stir to dissolve completely, heat to 45°C, and slowly drop Add isocyanate propyltrimethoxysilane, react at this temperature for 24h and keep stirring, and distill and remove solvent tetrahydrofuran after the reaction to obtain diphosphotrimethoxysilane;

[0022] 3) Diphosphotrimethoxysilane obtained in step 2) is used as the main hydrolysis precursor, aminopropyltrimethoxysilane and tetraethoxysilane are used as auxil...

Embodiment 2

[0025] A preparation method of a hydrolytically stable diphosphoric acid functionalized organosilicon high-temperature proton conductor. The specific steps are as follows:

[0026] 1) Before the reaction, the molar ratio of tetrasodium hydroxyethylene diphosphonate: tetrahydrofuran: propyltrimethoxysilane isocyanate is 0.4:10:1.0, and the raw materials are weighed for later use;

[0027] 2) Add tetrasodium hydroxyethylidene diphosphonate and solvent tetrahydrofuran into a four-neck flask equipped with a stirrer, thermometer, reflux condenser, and dropping funnel, stir to dissolve completely, heat to 45°C and then slowly add dropwise Propyl isocyanate trimethoxysilane, reacted at this temperature for 24h and kept stirring, and distilled off the solvent tetrahydrofuran after the reaction to obtain diphosphotrimethoxysilane;

[0028] 3) Diphosphotrimethoxysilane obtained in step 2) is used as the main hydrolysis precursor, aminopropyltrimethoxysilane and tetraethoxysilane are use...

Embodiment 3

[0031] A preparation method of a hydrolytically stable diphosphoric acid functionalized organosilicon high-temperature proton conductor. The specific steps are as follows:

[0032]1) Before the reaction, the molar ratio of tetrasodium hydroxyethylene diphosphonate: tetrahydrofuran: propyltrimethoxysilane isocyanate is 0.4:10:1.0, and the raw materials are weighed for later use;

[0033] 2) Add tetrasodium hydroxyethylidene diphosphonate and solvent tetrahydrofuran into a four-neck flask equipped with a stirrer, thermometer, reflux condenser, and dropping funnel, stir to dissolve completely, heat to 60°C and slowly add Propyl isocyanate trimethoxysilane, reacted at this temperature for 24h and kept stirring, and distilled off the solvent tetrahydrofuran after the reaction to obtain diphosphotrimethoxysilane;

[0034] 3) Diphosphotrimethoxysilane obtained in step 2) is used as the main hydrolysis precursor, aminopropyltrimethoxysilane and tetraethoxysilane are used as auxiliary ...

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Abstract

The invention relates to a bis phosphonic acid functional organosilicon high temperature proton conductor and a preparation method thereof, the preparation method of the proton conductor is as follows: (1) hydroxyethylidene bis-phosphonic acid tetrasodium salt and tetrahydrofuran are added into a four-mouth flask, completely dissolved, then heated to 45-60 DEG C, and then slowly added dropwise with isocyanate propyl trimethoxy silane, after the reaction is completed, bis phosphonic acid trimethoxy silane can be obtained; (2) the bis phosphonic acid trimethoxy silane as a main hydrolysis precursor, amino propyl trimethoxy silane and tetraethoxysilane as auxiliary hydrolysis precursors, ethanol as a solvent, and a suitable amount of hydrochloric acid as a catalyst are stirred at room temperature to obtain a sol; (3) the sol is dried, demoulded, and soaked with hydrochloric acid for post-processing to obtain the bis phosphonic acid functional organosilicon high temperature proton conductor. The bis phosphonic acid functional organosilicon high temperature proton conductor prepared by the method has high conductivity, good hydrolysis stability and thermal stability.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a hydrolytically stable diphosphonic acid functionalized organosilicon high-temperature proton conductor and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) are efficient and clean electrochemical power generation devices that can directly convert the chemical energy generated by the reaction of hydrogen with an oxidant into electricity. As the core component of PEMFCs, the proton exchange membrane plays the role of transferring protons and separating electrodes, which directly affects the performance and life of PEMFCs. [0003] At present, the most widely used is DuPont's nafion membrane, which is a perfluorosulfonic acid membrane with complex synthesis process and cannot work at high temperature. Compared with sulfonic acid, phosphonic acid has higher thermal stability, and is resistant to oxidation and hydrolysis, mak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10
CPCH01M8/1016H01M2300/0085Y02E60/50
Inventor 沈春晖项婧娈高山俊张鹏凡钱威
Owner WUHAN UNIV OF TECH
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