Phosphonic acid-grafted polybenzimidazole high-temperature proton exchange membrane and preparation method thereof

A polybenzimidazole and proton exchange membrane technology, which is applied in fuel cells, electrochemical generators, electrical components, etc., can solve the problems of decreased electrical conductivity of proton exchange membranes, and achieve good hydrolysis resistance stability and good high temperature resistance performance. , the effect of low cost

Inactive Publication Date: 2016-08-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the proton exchange membranes based on polybenzimidazole are phosphoric acid-doped polybenzimidazole proton exchange membranes. During the use of fuel cells, small molecule phosphoric acid will leak out of the membrane, resulting in a decrease in the conductivity of the proton exchange membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A phosphonic acid grafted polybenzimidazole high temperature proton exchange membrane, the preparation method is as follows:

[0027] 1) Put polybenzimidazole (number average molecular weight 20000, amount of structural unit substance 0.001mol, 0.308g) into a dry three-necked flask equipped with a stirrer and thermometer, and add 20mL dimethyl sulfoxide to obtain polyphenylene Add 3-glycidyloxypropyl trimethoxysilane (0.0005mol, 0.236g) after the bisimidazole solution is completely dissolved, the molar ratio of the polybenzimidazole structural unit: 3-glycidoxypropyl Trimethoxysilane=1:0.5, then react at 70°C for 24h under nitrogen flow to obtain a polybenzimidazole solution of grafted siloxane;

[0028] 2) Put the amino trimethylene phosphonic acid (0.229g, 0.001mol) equal to the amount of the polybenzimidazole structural unit material in step 1) into another three-necked flask equipped with a stirrer and a thermometer, and add 10 mL Dimethyl sulfoxide was completely disso...

Embodiment 2

[0032] A phosphonic acid grafted polybenzimidazole high temperature proton exchange membrane, the preparation method is as follows:

[0033] 1) Put polybenzimidazole (number average molecular weight 150,000, 0.001mol, 0.308g) into a dry three-necked flask equipped with a stirrer and thermometer, and add 5mL dimethyl sulfoxide to obtain polyphenylene After the bisimidazole solution is completely dissolved, add 3-glycidoxypropyltrimethoxysilane (0.001mol, 0.472g), the molar ratio of the polybenzimidazole unit structure substance: 3-glycidoxypropyl Trimethoxysilane=1:1, then react at 80°C for 48h under nitrogen flow to obtain a polybenzimidazole solution of grafted siloxane;

[0034] 2) Put the hydroxyethylene diphosphonic acid (0.001mol, 0.206g) equal to the amount of the polybenzimidazole structural unit material in step 1) into another three-necked flask equipped with a stirrer and a thermometer, Add 10 mL of dimethyl sulfoxide to completely dissolve it to obtain an organic polyph...

Embodiment 3

[0038] 1) Put polybenzimidazole (number-average molecular weight 150,000, amount of structural unit material 0.001mol, 0.308g) into a dry three-necked flask equipped with a stirrer and thermometer, and add 10mL dimethyl sulfoxide to obtain polyphenylene Add 3-glycidyloxypropyltrimethoxysilane (0.001,0.472g) after the bisimidazole solution is completely dissolved, the molar ratio of the polybenzimidazole structural unit substance: 3-glycidoxypropyltrimethyl Oxysilane=1:1, then react at 80°C for 24h under nitrogen flow to obtain a polybenzimidazole solution of grafted siloxane;

[0039] 2) Put an equivalent molar amount of amino trimethylene phosphonic acid (0.001 mol, 0.229 g) with the amount of polybenzimidazole structural unit material in step 1) into another three-necked flask equipped with a stirrer and thermometer, and add 10 mL Dimethyl sulfoxide was completely dissolved to obtain an organic polyphosphonic acid solution, and 3-glycidoxypropyltrimethoxysilane (0.002mol, 0.708...

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Abstract

The invention belongs to the technical field of fuel cells, and particularly relates to a phosphonic acid-grafted polybenzimidazole high-temperature proton exchange membrane and a preparation method thereof. The preparation method of the proton exchange membrane comprises the following steps: (1) dissolving polybenzimidazole into a solvent to obtain a polybenzimidazole solution, adding epoxy-alkoxy silane and then reacting to obtain a siloxane-grafted polybenzimidazole solution; (2) dissolving an organo phosphonic acid into the solvent to obtain an organo phosphonic acid solution, adding the epoxy-alkoxy silane and then reacting to obtain a phosphonic acid-bonded siloxane solution; and (3) slowly dropwise adding the siloxane-grafted polybenzimidazole solution to the phosphonic acid-bonded siloxane solution and then reacting for 6-12 hours to obtain sol, ageing the sol at 40-60 DEG C, baking the sol for 1-2 days, heating the sol to 80-100 DEG C, baking the sol for 8-18 hours, finally baking the sol at 110-130 DEG C for 6-8 hours and cooling and demolding the sol to obtain the phosphonic acid-grafted polybenzimidazole high-temperature proton exchange membrane.

Description

Technical field [0001] The invention belongs to the technical field of fuel cells, and specifically relates to a phosphonic acid grafted polybenzimidazole high-temperature proton exchange membrane and a preparation method thereof. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) is a new type of fuel cell with high efficiency and environmental protection. At present, the working temperature of proton exchange membrane fuel cells is generally around 80°C. The reason is that the proton conduction in the widely used Nafion series proton exchange membranes is heavily dependent on water. When the temperature is higher than 100°C and the relative humidity is low, the conductivity A sharp decline. However, fuel cell catalysts operating below 100°C are susceptible to CO poisoning and lose their activity. As the operating temperature increases, the catalyst's tolerance to CO increases. Therefore, the research and synthesis of proton exchange membrane materials th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1016H01M8/1018H01M8/1072H01M8/1081
CPCH01M8/1016H01M8/1018H01M8/1072H01M8/1081Y02E60/50
Inventor 沈春晖钱威高山俊项婧娈张鹏凡
Owner WUHAN UNIV OF TECH
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