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High-strength binary cross-linked alkaline anion exchange composite film, preparation method and application

A basic anion and composite membrane technology, which is applied in the fields of electrical components, climate sustainability, and final product manufacturing, can solve the problems of complex anion exchange membrane preparation process, decreased mechanical strength, and decreased membrane performance, so as to improve CO2 electricity. Chemical reduction performance, easy operation, low cost effect

Inactive Publication Date: 2018-12-14
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned skeletons are all synthetic organic polymers. The preparation process of these anion exchange membranes is not only complicated, but also expensive, and will also cause certain pollution to the environment.
In addition, these polymers are prone to Hoffman elimination or hydrogen substitution reactions, which will lead to a decrease in membrane performance or even degradation, resulting in a sharp decrease in the mechanical strength of the membrane [Journal of Membrane Science, 368(2011) 246-253], thus Membranes are easily damaged during actual assembly applications

Method used

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  • High-strength binary cross-linked alkaline anion exchange composite film, preparation method and application
  • High-strength binary cross-linked alkaline anion exchange composite film, preparation method and application
  • High-strength binary cross-linked alkaline anion exchange composite film, preparation method and application

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Embodiment 1

[0027] A preparation method of a high-strength binary cross-linked alkaline anion-exchange composite membrane:

[0028] 1) Dissolve 2g of PVA powder in 100mL of deionized water, heat and stir at 90°C until a transparent and homogeneous solution is prepared to obtain a 2% PVA stock solution;

[0029] 2) Configure the GG solution according to the mass ratio of PVA to GG=1:0.5;

[0030] 3) the above-mentioned PVA aqueous solution is mixed with the GG solution, after being stirred into a uniform transparent solution, the mixed solution is cast in a plastic disc, and naturally dried to form a film;

[0031] 4) Peel off the film and place it in an oven at 150°C for physical cross-linking for 1 h, then soak the film in 20 mL of 10% glutaraldehyde (GA, 50 wt%) acetone (>99.5 wt%) solution containing a small amount of hydrochloric acid, at room temperature After the chemical cross-linking reaction was carried out for 4 hours, the membrane was taken out, immersed in deionized water and...

Embodiment 2

[0034] A preparation method of a high-strength binary cross-linked alkaline anion-exchange composite membrane:

[0035] 1) Dissolve 2g of PVA powder in 100mL of deionized water, heat and stir at 90°C until a transparent and homogeneous solution is prepared to obtain a 2% PVA stock solution;

[0036] 2) Configure the GG solution according to the mass ratio of PVA to GG=1:0.5;

[0037] 3) the above-mentioned PVA aqueous solution is mixed with the GG solution, after being stirred into a uniform transparent solution, the mixed solution is cast in a plastic disc, and naturally dried to form a film;

[0038] 4) Peel off the film and place it in an oven at 150°C for physical cross-linking for 1 hour, then soak the film in 40 mL of 10% glutaraldehyde (GA, 50wt%) and 2-thiophenecarbaldehyde (TCA, 98wt%) containing a small amount of hydrochloric acid (The volume ratio of TCA and GA is =1:3, 1:4, 1:5, 1:6, 1:7) in acetone (>99.5wt%) solution, after chemical crosslinking reaction at room...

Embodiment 3

[0041] A preparation method of a high-strength binary cross-linked alkaline anion-exchange composite membrane:

[0042] 1) Dissolve 2g of PVA powder in 100mL of deionized water, heat and stir at 90°C until a transparent and homogeneous solution is prepared to obtain a 2% PVA stock solution;

[0043] 2) Configure the GG solution according to the mass ratio of PVA to GG=1:0.5;

[0044] 3) the above-mentioned PVA aqueous solution is mixed with the GG solution, after being stirred into a uniform transparent solution, the mixed solution is cast in a plastic disc, and naturally dried to form a film;

[0045] 4) Peel off the film and place it in an oven at 150°C for physical crosslinking for 1 h, then soak the film in 35 mL of 10% glutaraldehyde (GA, 50 wt%) and 7-methoxy-3,7 dihydrochloric acid containing a small amount of hydrochloric acid Methyloctanal (MDO, 98wt%) (the volume ratio of MDO and GA = 1:3, 1:4, 1:5, 1:6, 1:7) in acetone (>99.5wt%) solution, room temperature After t...

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Abstract

The invention discloses a high-strength binary cross-linked alkaline anion exchange composite film, a preparation method and an application of the composite film in electrochemical energy devices. Thecomposite film comprises hydroxyl-containing water-soluble polyvinyl alcohol and a water-soluble polymer containing quaternary ammonium groups. The preparation method comprises the following steps: preparing aqueous solutions from hydroxyl-containing water-soluble polyvinyl alcohol and the water-soluble polymer containing quaternary ammonium groups respectively; mixing the two solutions and pouring the mixed solution into a plastic culture dish, drying the mixed solution naturally to form a film and obtain the polymer film; stripping the polymer film from the culture dish, performing heat treatment for physical crosslinking, then performing chemical crosslinking, and finally immersing a product in a KOH solution for ion exchange. The alkaline anion exchange composite film has the advantages of being high in mechanical strength, good in conductivity, low in cost and environmental friendly, the preparation method is simple, has the advantages of mild reaction condition, short reaction time, high controllability and the like, and accordingly, large-scale production is facilitated.

Description

technical field [0001] The present invention relates to a method for CO 2 Electrocatalytic conversion with binary cross-linked high mechanical strength alkaline anion exchange composite membrane, preparation method and application, belonging to CO 2 Electrocatalytic conversion technology field. Background technique [0002] Polymer electrolyte membranes can be divided into proton exchange membranes and anion exchange membranes according to different polymers. At present, the most widely used proton exchange membrane is the perfluorosulfonic acid Nafion membrane produced by U.S. DuPont, which has high proton conductivity and excellent chemical stability. However, its preparation process is complicated and the cost is high (it has reached 500-800$ / m 2 ), and as CO 2 Electrochemical reduction membranes are prone to permeation of product formic acid [Electr°himica Acta, 111(2013) 351-358; Journal of Membrane Science, 541(2017) 214-223]. Therefore, it is necessary to study a...

Claims

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Application Information

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IPC IPC(8): C08J5/22H01G11/56H01M8/1044H01M8/1081C08L29/04C08L5/00
CPCC08J5/2275C08J5/2287C08J2329/04C08J2405/00H01G11/56H01M8/1044H01M8/1081Y02E60/50Y02P70/50
Inventor 乔锦丽王敏魏亚南
Owner DONGHUA UNIV
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