Nafion/amino acid-modified hollow mesoporous silicon hybrid membrane and preparation method and application thereof

A hollow mesoporous, amino-modified technology, which is applied in the manufacture of final products, electrochemical generators, collectors/separators, etc., can solve the problems of fuel cells that have not been reported in the literature, so as to promote the transfer of protons and enhance the water retention performance , the effect of high proton conductivity

Inactive Publication Date: 2015-03-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has been no literature report on the use of Nafion/ami...

Method used

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  • Nafion/amino acid-modified hollow mesoporous silicon hybrid membrane and preparation method and application thereof
  • Nafion/amino acid-modified hollow mesoporous silicon hybrid membrane and preparation method and application thereof
  • Nafion/amino acid-modified hollow mesoporous silicon hybrid membrane and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1: Preparation of Nafion / aspartic acid modified hollow mesoporous silicon-2% hybrid membrane.

[0026] Preparation of hollow mesoporous silicon: Measure 200mL of ethanol, 20mL of water, and 7mL of ammonia water, mix well, add 7mL of ethyl orthosilicate under vigorous stirring, and stir at room temperature for 12 hours to obtain silica microspheres, which are washed and dried by centrifugation. Add 1g of silica microspheres to a mixture of 240mL of water, 480mL of ethanol, 12mL of ammonia water, and 3.66g of cetyltrimethylammonium bromide, stir at room temperature for 30min, then quickly add 5.0mL of ethyl orthosilicate , and stirred for 6h to obtain double-layer silicon spheres, which were washed by centrifugation. Disperse the double-layer silica spheres in 250mL 0.2mol / L Na 2 CO 3 The solution was stirred at 50°C for 19 hours to obtain hollow silicon spheres, which were washed by centrifugation. Add hollow silicon spheres to 300mL methanol and 20mL concentr...

Embodiment 2

[0030] Example 2: Preparation of Nafion / phosphoserine-modified hollow mesoporous silicon-2% hybrid membrane.

[0031] Hollow mesoporous silicon was prepared by the same method as in Example 1.

[0032] Phosphoserine-modified hollow mesoporous silicon: Disperse 1 g of the above hollow mesoporous silicon in 120 mL of anhydrous toluene, mix it with 2.4 mL of 3-aminopropyltriethoxysilane, fill it with nitrogen and seal it, and reflux at 105°C for 24 hours. The obtained amino-modified hollow mesoporous silicon was dispersed in 150mL MES buffer solution to obtain a suspension having amino-modified hollow mesoporous silicon, wherein the preparation method of the MES buffer solution was: 2.66g 2-(N- Morpholine) ethanesulfonic acid was dissolved in 50 mL of water, adjusted to pH 6.5 with 2 mol / L NaOH solution, and then adjusted to 250 mL with water. Add 1.0 g of phosphoserine to 100 mL of MES buffer, then add 1 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 1 g o...

Embodiment 3

[0036] Example 3: Preparation of Nafion / oxidized cysteine ​​modified hollow mesoporous silicon-2% hybrid membrane.

[0037] Hollow mesoporous silicon was prepared by the same method as in Example 1.

[0038] Modified hollow mesoporous silicon with oxidized cysteine: Disperse 1g of the above hollow mesoporous silicon in 120mL of anhydrous toluene, mix it with 2.4mL 3-aminopropyltriethoxysilane, fill it with nitrogen and seal it at 105°C Refluxing reaction for 24 hours, the obtained amino-modified hollow mesoporous silicon was dispersed in 150 mL of MES buffer solution, wherein, the preparation method of the MES buffer solution was: 2.66 g of 2-(N-morpholine) ethanesulfonic acid was added to 50 mL of water Dissolve, adjust the pH to 6.5 with 2mol / L NaOH solution, and then dilute to 250mL with water. Add 1.0 g of cysteine ​​to 100 mL of MES buffer, then add 1 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 1 g of N-hydroxysuccinimide, respectively, Stir vig...

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Abstract

The invention discloses a Nafion/amino acid-modified hollow mesoporous silicon hybrid membrane which is constituted by Nafion and amino acid-modified hollow mesoporous silicon. The preparation process comprises the following steps: synthesizing silicon dioxide microspheres, preparing double-layer silicon dioxide microspheres by using hexadecyl trimethyl ammonium bromide as a template, and preparing hollow mesoporous silicon by removing cores and removing the template; reacting hollow mesoporous silicon with 3-aminopropyl triethoxysilane to obtain amino-modified hollow mesoporous silicon; preparing amino acid-modified hollow mesoporous silicon from amino-modified hollow mesoporous silicon and an amino acid under condensation action of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide; and co-mixing amino acid-modified hollow mesoporous silicon with a Nafion solution to obtain a casting solution, and preparing the hybrid membrane by a tape casting method. The preparation process of the hybrid membrane disclosed by the invention is environment-friendly and strong in controllability, and the prepared Nafion/amino acid-modified hollow mesoporous silicon hybrid membrane is applied to direct methanol fuel cells and has relatively high proton conductivity and good methanol permeability.

Description

technical field [0001] The invention relates to a Nafion / amino acid modified hollow mesoporous silicon hybrid membrane and its preparation and application, and belongs to the technical field of organic-inorganic hybrid membranes. Background technique [0002] Facing our country's increasingly depleted energy and seriously polluted environment, it has become an important task to find renewable clean energy. A fuel cell is an electrochemical device that uses a redox reaction between a renewable fuel (hydrogen, alcohol, hydrocarbons, etc.) and an oxidant (air, oxygen) to convert the chemical energy of the fuel directly into electrical energy without going through a thermal process. , has the advantages of high fuel utilization rate and greenness, and adapts to the sustainable development of human society. Among them, direct methanol fuel cell (DMFC) uses methanol as fuel, and is considered to be the most promising new generation of portable fuel cells due to its simple structu...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08K9/06C08K9/04C08K7/26C08J5/22H01M8/10H01M8/02H01M8/0202H01M8/1016
CPCC08J5/2237C08J2327/18C08K7/26C08K9/04C08K9/06C08L2203/20H01M8/0241C08L27/18Y02E60/50Y02P70/50
Inventor 吴洪尹永恒姜忠义邓万玉王鸿燕李安平
Owner TIANJIN UNIV
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