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Chitosan/in-situ amphoteric silicon-titanium hybrid film as well as preparation method and application thereof

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

Inactive Publication Date: 2014-06-11
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 as well as preparation method and application thereof
  • Chitosan/in-situ amphoteric silicon-titanium hybrid film as well as preparation method and application thereof
  • Chitosan/in-situ amphoteric silicon-titanium hybrid film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 1 g molecular weight as 6×10 5 , Chitosan with a degree of deacetylation of 91% was dissolved in 25 g of acetic acid aqueous solution with a mass concentration of 2%, at 70 oC Complete dissolution with stirring. At room temperature, 0.0355 g of ethyl orthosilicate was added to 5 g of aqueous hydrochloric acid with a mass concentration of 7%, and hydrolyzed at 45 °C for 2 h. 0.0323 g of titanium tetrachloride was added to 5 g of 20% ethanol aqueous solution, and hydrolyzed at room temperature for 2 h. The two were mixed and the reaction was stirred at room temperature for 3 h. Then, 0.0032 g of 3,4-dihydroxyphenylpropionic acid was added, and the mixture was chelated at room temperature for 1 h. Continue to add 0.0037g of 3-aminopropyltrimethoxysiloxane to react in a water bath at 60°C for 4h to obtain a brown-red amphoteric inorganic silicon-titanium sol solution. The brown-red amphoteric inorganic silicon-titanium sol solution was slowly added to the chitosa...

Embodiment 2

[0020] Weigh 1 g molecular weight as 6×10 5 , Chitosan with a degree of deacetylation of 91% was dissolved in 50 g of acetic acid aqueous solution with a mass concentration of 2%, at 75 oC Complete dissolution with stirring. At room temperature, 0.0828 g of ethyl orthosilicate was added to 5 g of aqueous hydrochloric acid with a mass concentration of 5%, and hydrolyzed at 30 °C for 2 h. 0.0754 g of titanium tetrachloride was added to 5 g of 50% ethanol aqueous solution, and hydrolyzed at room temperature for 2 h. After mixing the two, the reaction was stirred at room temperature for 3.5 h. Then, 0.0061 g of 3,4-dihydroxyphenylpropionic acid was added, and the mixture was chelated at room temperature for 1 h. Continue to add 0.0086g of 3-aminopropyltrimethoxysiloxane to react in a water bath at 45°C for 5h to obtain a brown-red amphoteric inorganic silicon-titanium sol solution. The brown-red amphoteric inorganic silicon-titanium sol solution was slowly added to the chitos...

Embodiment 3

[0022] Weigh 1 g molecular weight as 6×10 5 , Chitosan with a degree of deacetylation of 91% was dissolved in 30g of acetic acid aqueous solution with a mass concentration of 2%, at 80 o Stir at C for complete dissolution. At room temperature, 0.0524 g of ethyl orthosilicate was added to 5 g of aqueous hydrochloric acid with a mass concentration of 5%, and hydrolyzed at 60 °C for 2 h. 0.0239 g of titanium tetrachloride was added to 5 g of 30% ethanol aqueous solution, and hydrolyzed at room temperature for 2 h. After mixing the two, the reaction was stirred at room temperature for 4 h. Then, 0.0025 g of 3,4-dihydroxyphenylpropionic acid was added, and the mixture was chelated at room temperature for 1 h. Continue to add 0.0068g of 3-aminopropyltrimethoxysiloxane and react in a water bath at 30°C for 5h to obtain a brown-red amphoteric inorganic silicon-titanium sol solution. The brown-red amphoteric inorganic silicon-titanium sol solution was slowly added to the chitosan s...

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Abstract

The invention discloses a chitosan / in-situ amphoteric silicon-titanium hybrid film as well as a preparation method and an application thereof. The thickness of the hybrid film is 80-120 microns, the hybrid membrane is composed of chitosan, silicon dioxide and titanium dioxide. The preparation process comprises the following steps: preparing a chitosan solution, mixing amphoteric inorganic silicon-titanium sol and the chitosan solution to perform condensation polymerization to obtain a casting film solution, performing casting film process on the casting film solution to obtain the chitosan / in-situ amphoteric silicon-titanium hybrid film. The hybrid film is used as a direct-methanol fuel cell proton exchange membrane. The preparation method is simple and easy to operate, acid-stage group and basic group co-exist in inorganic particles in the film, the in-situ sol-gel method enables the nano-level silicon-titanium particles to be uniformly distributed in the hybrid film, the performance of the film is effectively improved, and the hybrid film has low methanol permeability and high proton conduction.

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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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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