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
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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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