Preparation method of cross-linked organic-inorganic alkaline polyelectrolyte membrane

A polyelectrolyte and alkaline technology, which is applied in the field of preparation of organic-inorganic composite alkaline polyelectrolyte membrane, can solve the problem that the composite alkaline polyelectrolyte membrane needs to be improved, it is difficult to meet the needs of battery operation, and it cannot reflect alkali resistance, etc. problem, to achieve the effect of improving alkaline stability, low price, and simple preparation method

Pending Publication Date: 2022-07-26
HUBEI ENG UNIV
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Problems solved by technology

However, due to the lack of chemical bonding between the filled quaternized polymer and the porous substrate, the alkaline stability of the resulting composite alkaline polyelectrolyte membrane still needs to be improved, although the alkaline stability of the composite membrane reported in the patent application is greater than 500h , but it should be pointed out that the alkali stability test is to soak the membrane in a 1mol / L KOH solution at room temperature, and take the time when the ion conductivity drops to 70% before soaking as the alkali resistance time
Since the operating temperature of alkaline anion exchange membrane fuel cells is generally 60-80°C, the evaluation results at room temperature cannot reflect the alkali resistance of the membrane at high temperature. Moreover, when the ion conductivity drops to only 70 %, the ionic conductivity of the composite membrane is only 25mS / cm, which is difficult to meet the needs of the actual operation of the battery

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  • Preparation method of cross-linked organic-inorganic alkaline polyelectrolyte membrane

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Embodiment 1

[0039] Embodiment 1 A preparation method of a cross-linked organic-inorganic composite alkaline polyelectrolyte membrane, the steps are as follows:

[0040] (1) Soak the commercial BC membrane in deionized water for 48h to fully absorb it, then heat it in a 0.1mol / L NaOH solution in a water bath at 90°C for 3h, then cool it to room temperature, and then reheat it. Repeatedly wash with a large amount of deionized water, and finally test the pH value of the film by gently pressing the surface of the film with pH test paper. When the pH value is neutral, a purified bacterial cellulose film is obtained. The scanning electron microscope image is shown in figure 1 ;

[0041] (2) Pour 90ml of tetraethyl orthosilicate solution into 400ml of absolute ethanol, stir and mix, add 2ml of 25wt% ammonia water, adjust the pH of the mixture to 8.5, and then add about 10×10cm of pure bacterial fiber membrane Put it into the mixed solution and let it stand at room temperature for 24 hours, then...

Embodiment 2

[0055] Embodiment 2 A preparation method of a cross-linked organic-inorganic composite alkaline polyelectrolyte membrane, the steps of which are as follows:

[0056] (1) Soak the commercialized BC membrane in deionized water for 32 hours to fully absorb it, and then heat it in a 0.2 mol / L NaOH solution in a water bath at 80 °C for 2.5 hours, and then cool it to room temperature. Then repeatedly wash with a large amount of deionized water, and finally use pH test paper to lightly press the surface of the membrane to test its pH value. When the pH value is neutral, a purified bacterial cellulose membrane is obtained;

[0057] (2) Pour 9ml of tetraethyl orthosilicate solution into 400ml of absolute ethanol, and add 2ml of ethanolamine. After stirring and mixing, put the pure bacterial fiber membrane of about 10 × 10 cm into the mixed solution and let it stand at room temperature for 20 hours. Quickly wash twice with absolute ethanol; pour 100ml of deionized water into 400ml of ab...

Embodiment 3

[0061] Embodiment 3 A preparation method of a cross-linked organic-inorganic composite alkaline polyelectrolyte membrane, the steps are as follows:

[0062](1) Soak the commercialized BC membrane in deionized water for 48 hours to fully absorb it, then heat it in a 0.5 mol / L NaOH solution in a water bath at 90 °C for 2 hours, then cool it to room temperature, and then reheat it. Repeatedly wash with a large amount of deionized water, and finally test the pH value of the membrane by gently pressing the surface of the membrane with pH test paper. When the pH value is neutral, a purified bacterial cellulose membrane is obtained;

[0063] (2) Pour 27ml of tetraethyl orthosilicate solution into 400ml of absolute ethanol, add 2ml of diethanolamine, stir and mix, and put about 10×10cm of pure bacterial fiber membrane into the mixed solution and let stand for 28h at room temperature, Quickly wash twice with absolute ethanol; pour 100 ml of deionized water into 400 ml of absolute ethan...

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Abstract

The invention relates to the technical field of fuel cells, and particularly discloses a preparation method of a cross-linked organic-inorganic composite alkaline polyelectrolyte membrane, which comprises the following steps: (1) purifying bacterial cellulose; (2) coating the bacterial cellulose membrane with silicon dioxide by a sol-gel method; (3) carrying out carbon-carbon double bond modification on the silicon dioxide coated bacterial cellulose membrane; (4) dissolving a cationic monomer to obtain a cationic monomer solution; and (5) performing in-situ polymerization on the cationic monomer solution, and filling pores of the silicon dioxide coated bacterial cellulose membrane with the cationic monomer solution. The surface of the nanofiber is coated with silicon dioxide by utilizing hydroxyl on the surface of the bacterial cellulose, so that the chemical stability and the mechanical property are improved, and further modification is facilitated; in addition, the cationic polyelectrolyte is subjected to in-situ polymerization filling, so that the ionic conductivity is further improved, and the preparation method is expected to have a wide application prospect in the field of alkaline polyelectrolyte fuel cells.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a preparation method of a cross-linked organic-inorganic composite alkaline polyelectrolyte membrane. Background technique [0002] Fuel cells are an important technology for hydrogen energy utilization, and have become the future development direction of research in the field of energy storage and conversion. The reaction product of the fuel cell is mainly water, which is environmentally friendly, and has convenient operation and simple structure. Fuel cells can be divided into five types according to the electrolyte they use. Among them, polymer membrane fuel cells can be divided into: proton exchange membrane fuel cells and alkaline anion exchange membrane fuel cells. [0003] Proton exchange membrane fuel cells using proton exchange membranes as electrolytes have been used for demonstration applications in buses and automobiles, but they also suffer from high cost of cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1072H01M8/1051H01M8/106C08J9/40C08L1/02
CPCH01M8/1072H01M8/1074H01M8/1051H01M8/106C08J9/405C08J9/40C08J2301/02
Inventor 龚春丽曹明结刘海聂时君吴娟傅金玉黄兰兰文胜
Owner HUBEI ENG UNIV
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