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A composite membrane for acid-base water electrolysis and its preparation method and application

A technology of water electrolysis and composite membrane, which is applied in the field of water electrolysis, can solve the problems of huge difference in molecular structure, large membrane resistance of bipolar membrane, and offset technical advantages, so as to improve battery performance and mechanical strength, reduce decomposition voltage, and avoid membrane The effect of large resistance

Active Publication Date: 2021-08-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the huge difference in molecular structure between the cation exchange membrane and the anion exchange membrane, there is a lack of effective binder between the membranes, resulting in a large membrane resistance of the bipolar membrane, which greatly offsets the water electrolysis of the bipolar membrane. Technical advantages

Method used

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  • A composite membrane for acid-base water electrolysis and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step 1: Weigh 148g of polyphosphoric acid into a 250mL three-neck flask, put it in a 160°C oil bath, stir mechanically and pass in nitrogen protection, the nitrogen flow rate is 200mL / min, and continue heating for 40min. Then, 3.2465g of 3,3'-diaminobenzidine was added into the three-necked flask, mechanically stirred in an oil bath at 160°C for 3h, the length of the stirring blade was 15cm, and the stirring speed was 500r / min. Then the temperature was raised to 180°C, 2.5171g of isophthalic acid, 0.0547g of triphenyl phosphate and 4.52g of phosphorus pentoxide were sequentially added, and the temperature was raised to 220°C for 24 hours to obtain a polymer product. After the reaction, the product in the flask is quickly poured into deionized water, and the refined polybenzimidazole polymer is obtained through steps such as adding alkali to remove acid, drying, pulverizing, washing with water, and washing with ethanol.

[0041] Step 2: Dissolve 10g of dicyandiamide and ...

Embodiment 2

[0045] Step 1: Weigh 3.28g of 3,4-diaminobenzoic acid into a 100ml three-necked flask, measure 25ml of Eaton reagent into the three-necked flask, heat in an oil bath at 140°C, and mechanically stir at a rate of 300r / min. After 2 hours. The viscous synthetic product is quickly poured into deionized water, and the refined ABPBI polymer is obtained through steps such as adding alkali to remove acid, drying, crushing, washing with water, and washing with ethanol.

[0046] Step 2: Dissolve 10g of dicyandiamide and 5g of oxalic acid in 50g of deionized water, stir for 4 hours, then dry in vacuum at 80°C for 24 hours to obtain white crystals, grind them thoroughly and place them in a crucible, then calcinate them in a tube furnace. Heating from room temperature to 550°C with a heating rate of 5°C min -1 , air atmosphere, after heating up to the set temperature, keep it for 4 hours, cool down with the furnace, transfer it to a mortar and grind it into powder carefully, then wash it w...

Embodiment 3

[0051] Step 1: Weigh 168g of polyphosphoric acid and place it in a 250mL three-neck flask, put it in an oil bath at 160°C, stir mechanically and pass in nitrogen protection, the nitrogen flow rate is 200mL / min, and continue heating for 30min. Then, 3.2465g of 3,3'-diaminobenzidine was added into the three-necked flask, mechanically stirred in an oil bath at 160°C for 3h, the length of the stirring blade was 15cm, and the stirring speed was 500r / min. Then the temperature was raised to 180°C, 2.2427g of isophthalic acid, 0.2282g of 3,4-diaminobenzoic acid, 0.0412g of triphenyl phosphate and 4.324g of phosphorus pentoxide were added in sequence, and reacted at 200°C for 24 hours to obtain a polymer product. After the reaction, the product in the flask is quickly poured into deionized water, and the refined polybenzimidazole polymer is obtained through steps such as adding alkali to remove acid, drying, pulverizing, washing with water, and washing with ethanol.

[0052] Step 2: Di...

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Abstract

The invention belongs to the field of water electrolysis, and in particular relates to a composite membrane for acid-base water electrolysis and its preparation and application. The raw materials are polybenzimidazole and C 3 N 4 , C 3 N 4 The mass fraction is 0.1‑1.5wt.%; first prepare polybenzimidazole and C 3 N 4 nanosheets, then PBI and C 3 N 4 The nanosheets were dispersed in the solvent respectively to obtain PBI solutions S1, C 3 N 4 The nanosheet dispersion S2, S1 and S2 are uniformly mixed and stirred to obtain the casting solution S3, which is cast on a flat glass with grooves, and vacuum-dried to obtain a composite membrane for acid-base water electrolysis. The composite membrane has good mechanical properties, and when applied in acid-base water electrolysis, it can significantly reduce the decomposition voltage of water electrolysis, reduce energy consumption, and exhibit good battery performance.

Description

technical field [0001] The invention belongs to the field of water electrolysis, and in particular relates to a composite membrane for acid-base water electrolysis, a preparation method and application thereof. Background technique [0002] Water electrolysis provides an energy conversion route to produce hydrogen from water. If the power source of electrolyzed water is completely from renewable energy, it can truly realize CO 2 zero emissions. The purity of hydrogen obtained in this way is very high, which can reach more than 99.99%. Conventional water electrolysis research mainly focuses on alkaline water electrolysis, alkaline solid electrolyte water electrolysis, proton exchange membrane water electrolysis, and high-temperature solid oxide water electrolysis. However, the above water electrolysis has the problem that the kinetic rate of the acidic oxygen evolution reaction (OER) is slow or the kinetic rate of the alkaline hydrogen evolution reaction (HER) is slow, resu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B13/08C25B1/04
CPCC25B13/08Y02E60/36
Inventor 邵志刚吕波
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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