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Chitosan/in-situ amphoteric silicon-titanium hybrid film and its preparation method and application

A chitosan and hybrid membrane technology, which is applied in the field of chitosan/in-situ amphoteric silicon-titanium hybrid membrane and its preparation, can solve the problem that proton exchange membrane has not been reported in the literature, and achieves prevention of agglomeration, low methanol The effect of permeability and process is simple and easy to operate

Inactive Publication Date: 2016-02-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, in situ generation of chitosan / in situ amphoteric silicon-titanium hybrid membranes for proton exchange membranes in direct methanol fuel cells has not been reported in the literature

Method used

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  • Chitosan/in-situ amphoteric silicon-titanium hybrid film and its preparation method and application
  • Chitosan/in-situ amphoteric silicon-titanium hybrid film and its preparation method and application
  • Chitosan/in-situ amphoteric silicon-titanium hybrid film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 1g with a molecular weight of 6×10 5 , the degree of deacetylation is 91% chitosan dissolved in 25g mass concentration of 2% acetic acid aqueous solution, at 70 oC Stir for complete dissolution. At room temperature, 0.0355g of ethyl orthosilicate was added to 5g of aqueous hydrochloric acid with a mass concentration of 7%, and hydrolyzed at 45°C for 2h. Add 0.0323g of titanium tetrachloride to 5g of 20% ethanol aqueous solution by mass fraction, and hydrolyze for 2h at room temperature. After mixing the two, the reaction was stirred at room temperature for 3h. Then add 0.0032g of 3,4-dihydroxyphenylpropionic acid and place it at room temperature for chelation reaction for 1h. Continue to add 0.0037g of 3-aminopropyltrimethoxysiloxane and react in a water bath at 60°C for 4 hours to obtain a maroon amphoteric inorganic silicon-titanium sol solution. Slowly add the maroon amphoteric inorganic silicon-titanium sol solution into the chitosan solution, stir at room...

Embodiment 2

[0019] Weigh 1g with a molecular weight of 6×10 5 , the degree of deacetylation is 91% chitosan dissolved in 50g mass concentration of 2% acetic acid aqueous solution, at 75 oC Stir for complete dissolution. At room temperature, 0.0828g of ethyl orthosilicate was added to 5g of aqueous hydrochloric acid solution with a mass concentration of 5%, and hydrolyzed at 30°C for 2h. Add 0.0754g of titanium tetrachloride to 5g of 50% ethanol aqueous solution, and hydrolyze at room temperature for 2h. After mixing the two, the reaction was stirred at room temperature for 3.5h. Then add 0.0061g of 3,4-dihydroxyphenylpropionic acid and place it at room temperature for chelation reaction for 1h. Continue to add 0.0086g of 3-aminopropyltrimethoxysiloxane and react in a water bath at 45°C for 5h to obtain a maroon amphoteric inorganic silicon-titanium sol solution. Slowly add the maroon amphoteric inorganic silicon-titanium sol solution into the chitosan solution, stir at room temperatur...

Embodiment 3

[0021] Weigh 1g with a molecular weight of 6×10 5 , the degree of deacetylation is 91% of chitosan dissolved in 30g mass concentration of 2% acetic acid aqueous solution, at 80 o C for complete dissolution. At room temperature, 0.0524g of ethyl orthosilicate was added to 5g of aqueous hydrochloric acid solution with a mass concentration of 5%, and hydrolyzed at 60°C for 2h. Add 0.0239g of titanium tetrachloride to 5g of 30% ethanol aqueous solution, and hydrolyze at room temperature for 2h. After mixing the two, the reaction was stirred at room temperature for 4h. Then add 0.0025g of 3,4-dihydroxyphenylpropionic acid and place it at room temperature for chelation reaction for 1h. Continue to add 0.0068g of 3-aminopropyltrimethoxysiloxane and react in a water bath at 30°C for 5h to obtain a maroon amphoteric inorganic silicon-titanium sol solution. Slowly add the maroon amphoteric inorganic silicon-titanium sol solution into the chitosan solution, stir at room temperature f...

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Abstract

The invention discloses a chitosan / in-situ amphoteric silicon-titanium hybrid film as well as its preparation and application. The thickness of the hybrid film is 80-120 μm, and it is composed of chitosan, silicon dioxide and titanium dioxide. Its preparation process includes: preparation of chitosan solution, preparation of amphoteric inorganic silicon-titanium sol solution, mixing amphoteric inorganic silicon-titanium sol and chitosan solution for polycondensation reaction to obtain casting liquid, and casting film liquid through casting process A chitosan / in situ amphoteric silicon-titanium hybrid film was obtained. The hybrid membrane is used as a proton exchange membrane for a direct methanol fuel cell. The advantages of the present invention are: the preparation method is simple and easy to operate, acid groups and basic groups co-exist in the inorganic particles in the film, and the in-situ sol-gel method makes the nano-scale silicon-titanium particles evenly distributed in the hybrid film, The performance of the membrane is effectively improved, and the hybrid membrane has lower methanol permeability and higher proton conductivity.

Description

technical field [0001] The invention relates to a chitosan / in-situ amphoteric silicon-titanium hybrid membrane, a preparation method and an application thereof, belonging to the organic-inorganic hybrid membrane technology. Background technique [0002] As a new type of chemical energy, fuel cells can directly convert chemical energy into electrical energy without combustion, and have the advantages of high power generation efficiency, environmental friendliness, and low operating noise. Among them, the direct methanol fuel cell uses unreformed methanol aqueous solution as fuel. Compared with other fuel cells, it has the advantages of simple system structure, fast startup at room temperature, high volumetric energy density, high operational reliability, and low cost. It is considered to be one of the most competitive batteries in new portable power sources in the future. Among them, the proton exchange membrane is one of the key components of the direct methanol fuel cell. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L5/08C08K3/36C08K3/22C08J5/22H01M8/02H01M2/16H01M8/1041H01M50/403H01M50/446H01M50/497
CPCY02E60/50Y02P70/50
Inventor 吴洪尹永恒姜忠义
Owner TIANJIN UNIV
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