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Heteropolyacid modified cellulose nanofiber compound, proton exchange membrane and preparation of heteropolyacid modified cellulose nanofiber compound and proton exchange membrane

A technology of proton exchange membranes and nanofibers, applied in plant fibers, fiber treatment, organic diaphragms, etc., can solve the problems that heteropolyacids cannot be directly fixed, difficult to obtain, and have high solubility

Active Publication Date: 2022-05-17
CHINA THREE GORGES CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the high solubility of heteropolyacid in the prior art in water, the heteropolyacid is easy to run off, the heteropolyacid cannot be directly fixed on the cellulose, and the heteropolyacid will promote cellulose It is hydrolyzed to glucose, which leads to the defect that it is difficult to obtain materials that can stably and effectively improve the proton conductivity of the proton exchange membrane, thereby providing a heteropolyacid modified cellulose nanofiber composite, a proton exchange membrane and its preparation

Method used

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  • Heteropolyacid modified cellulose nanofiber compound, proton exchange membrane and preparation of heteropolyacid modified cellulose nanofiber compound and proton exchange membrane
  • Heteropolyacid modified cellulose nanofiber compound, proton exchange membrane and preparation of heteropolyacid modified cellulose nanofiber compound and proton exchange membrane
  • Heteropolyacid modified cellulose nanofiber compound, proton exchange membrane and preparation of heteropolyacid modified cellulose nanofiber compound and proton exchange membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0061] This embodiment provides a kind of preparation method of composite proton exchange membrane:

[0062] Disperse 1 g of cellulose nanofibers in 100 mL of deionized water (120 w ultrasonic for 0.5 h), after adding 0.2 g of dopamine hydrochloride and 0.2 g of tris-HCl buffer and stirring evenly, adjust the pH of the dispersion with 0.1 mol / L NaOH to 8.5. After reacting at room temperature for 24 hours, it was washed and dried to obtain polydopamine-wrapped cellulose nanofibers DC. Afterwards, take 1 g of the prepared DC powder and disperse it in 35 mL of acetic acid, add 0.25 g of trimesaldehyde and stir evenly, react at room temperature for 12 hours, separate the solid from the liquid, wash the solid with water, remove unreacted trimes, and dry Obtain a solid powder; then take 1 g of the solid powder and disperse it in 35 mL of acetic acid, add 0.184 g of 1,3,5-tris(4-aminophenyl)benzene and stir evenly, react at room temperature for 12 hours, separate the solid from the ...

Embodiment 2

[0066] This example provides a method for preparing a composite proton exchange membrane. The specific steps are basically the same as those in Example 1, except that the heteropolyacid used in this example is silicotungstic acid.

Embodiment 3

[0068] This embodiment provides a kind of preparation method of composite proton exchange membrane:

[0069] Disperse 1 g of cellulose nanofibers in 100 mL of deionized water (120 w ultrasonic for 0.5 h), after adding 0.2 g of dopamine hydrochloride and 0.2 g of tris-HCl buffer and stirring evenly, adjust the pH of the dispersion with 0.1 mol / L NaOH to 8.5. After reacting at room temperature for 24 hours, it was washed and dried to obtain polydopamine-wrapped cellulose nanofibers DC. Afterwards, take 1 g of the prepared DC powder and disperse it in 35 mL of acetic acid, add 0.25 g of trimesaldehyde and stir evenly, react at room temperature for 48 hours, separate the solid from the liquid, wash the solid with water, remove unreacted trimes, and dry Obtain a solid powder; then take 1 g of the solid powder and disperse it in 35 mL of acetic acid, add 0.184 g of 1,3,5-tris(4-aminophenyl)benzene and stir evenly, react at room temperature for 48 hours, separate the solid and liqui...

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Abstract

The invention provides a heteropoly acid modified cellulose nanofiber compound, a proton exchange membrane and preparation thereof, belongs to the field of hydrogen production by electrolyzing water, and overcomes the defects that heteropoly acid in the prior art is relatively high in solubility in water, is easy to lose, can promote cellulose to be hydrolyzed into glucose, and is easy to degrade. The material capable of stably and effectively improving the proton conductivity of the proton exchange membrane is difficult to obtain. The heteropoly acid modified cellulose nanofiber compound disclosed by the invention comprises cellulose nanofibers; the surface of the cellulose nanofiber is coated with the polydopamine layer; the covalent organic framework is modified on the surface of the polydopamine layer; heteropoly acid loaded on the covalent organic framework is combined through a covalent bond.

Description

technical field [0001] The invention belongs to the field of hydrogen production by electrolyzing water, and in particular relates to a heteropolyacid-modified cellulose nanofiber compound, a proton exchange membrane and its preparation. Background technique [0002] With the gradual reduction of the use of fossil energy, people's demand for new energy such as hydrogen energy is more urgent. Hydrogen energy is a safe, reliable and clean energy source. The use of proton exchange membrane electrolyzers to electrolyze water to produce hydrogen is an important technology in the field of hydrogen energy. Among them, the proton exchange membrane (PEM), as the core component of the proton exchange membrane electrolyzer, mainly plays the role of separating the anode and cathode and conducting protons. The core parameter of PEM, the proton conductivity, also directly affects the performance of the electrolyzer. Therefore, how to improve the proton conductivity of PEM has always bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/61D06M15/37D06M11/70C25B13/08C25B1/04D06M101/06
CPCD06M15/61D06M15/37D06M11/70C25B13/08C25B1/04D06M2101/06Y02E60/36Y02E60/50
Inventor 王倩翟绍雄尹立坤路忠睿艾宇娜贾骁阳杨予萌何少剑林俊
Owner CHINA THREE GORGES CORPORATION
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