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Modified alcohol-barrier proton exchange film based on hydrophilic area surface and its production

A technology of surface modification and proton exchange, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve good battery performance, reduce methanol permeation, and easy industrialization

Inactive Publication Date: 2007-01-17
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Judging from the current research situation, although the synthesis of new membrane materials has made great progress, it is still difficult for the new materials to surpass the perfluorosulfonic acid membrane in terms of proton conductivity, chemical stability, thermal stability and mechanical properties. To replace the latter, and there is still a long way to go for large-scale industrial production of new materials, so improving the existing perfluorosulfonic acid membrane system to reduce its methanol permeation is the fastest way to realize the commercialization of direct methanol fuel cells as soon as possible. Feasible method

Method used

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  • Modified alcohol-barrier proton exchange film based on hydrophilic area surface and its production
  • Modified alcohol-barrier proton exchange film based on hydrophilic area surface and its production
  • Modified alcohol-barrier proton exchange film based on hydrophilic area surface and its production

Examples

Experimental program
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Effect test

Embodiment 1

[0022] 1) Place 4cm×4cm Nafion-117 membrane in 3%H 2 o 2 , 0.5mol / lH 2 SO 4 1. Treat in deionized water at 60°C for 1 hour, dry in a vacuum oven at 60°C for 24 hours, weigh, take it out, and place it in deionized water to fully immerse and hydrate for more than 24 hours.

[0023] 2) Prepare a 1:6 mixed solution of tetraethoxyn-silane and methanol, put the fully hydrated Nafion117 membrane in step 1) into the organosilane solution for 1 min, take it out, wash with methanol to remove the residual silane solution on the membrane surface , transfer the film to a vacuum drying oven at 80°C for complete reaction and dry it for more than 24 hours and weigh it. The surface functional group is hydroxyl, and the inorganic composite is a nano-scale silicon oxide network structure. The amount of silicon oxide is 4.0 % of the composite film.

Embodiment 2

[0025] 1) Place 4cm×4cm Nafion-117 membrane in 4%H 2 o 2 , 0.8mol / l H 2 SO 4 1. Treat in deionized water at 70°C for 1h, dry in a vacuum oven at 70°C for 24h, weigh, make a 1:1 mixed solution of methanol and deionized water, take out the membrane and put it into the mixed solution to fully immerse and hydrate More than 24 hours.

[0026] 2) Make a 1:5 mixed solution of vinyltrichlorosilane and ethanol, put the fully hydrated Nafion117 membrane in step 1) into the organosilane solution for 10 minutes, take it out, wash with methanol to remove the residual silane solution on the membrane surface, Transfer the film to a vacuum drying oven at 80°C to complete the reaction and dry it for more than 24 hours and weigh it. The surface functional group is hydroxyl, and the inorganic composite is a nano-scale silicon oxide network structure. The amount of silicon oxide is 10.14%. composite film.

Embodiment 3

[0028] 1) Place 4cm×4cm Nafion-117 membrane in 5%H 2 o 2 , 1.0mol / l H 2 SO 4 1. Treat in deionized water at 80°C for 1h, dry in a vacuum oven at 80°C for 24h, weigh, make a 2:1 mixed solution of methanol and deionized water, take out the membrane and put it into the mixed solution to fully immerse and hydrate More than 24 hours.

[0029] 2) Make a 1:4 mixed solution of 3-mercaptopropyltrimethoxysilane and acetone, put the fully hydrated Nafon117 membrane in step 1) into the organosilane solution for 5 minutes, take it out, wash with methanol to remove the residue on the membrane surface Transfer the film to a vacuum drying oven at 80°C for complete reaction and weigh it after drying for more than 24 hours. The surface functional group is 3-mercaptopropyl, and the inorganic composite is a nano-scale silicon oxide network structure. The amount of silicon oxide was 3.6% of the composite film.

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Abstract

An hydrophile area surface modified methanol concentration proton exchange film and the preparation method, involves a proton exchange film fuel battery, provides methanol concentration proton exchange compound film and the preparation method using for the direct mellow fuel battery with the better methanol concentration and proton conducting capability and based on hydrophile area surface modified. It is nanometer inorganic organic compound film with the framework of polyperfluorocarboxylic acid, the quality content is 79%~97%; the chemistry compound surface in the ion cluster hydrophile area is with different nanometer silicon oxide with functionalization group, the quality content is 3%~21%. The method is: put the polyperfluorocarboxylic acid film into the H2O2, H2SO4 and water in turn when processing preparation, takes out and put into the methanol water-solution for hydration after drying, gets the ready polyperfluorocarboxylic acid film to be used; mixes the mixing solution by the silance resin acceptor and the organic solvent, immerges the ready polyperfluorocarboxylic acid film into the mixing solution, drying after dipping, gets the methanol concentration proton exchange compound film based on the hydrophile area surface modified.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell, in particular to a method for preparing an alcohol-resisting proton exchange composite membrane based on surface modification of a hydrophilic region. Background technique [0002] The fuel cell is a device that directly converts the chemical energy of the fuel into electrical energy. Because it has no complicated combustion process and releases less heat energy, the energy conversion rate of the fuel is greatly improved; and the system is environmentally friendly. Direct methanol fuel cell (DMFC) using methanol as fuel, because methanol is a liquid at room temperature, and H 2 It is safer and more reliable, easy to store and transport, and convenient to replenish fuel. Methanol can be obtained directly from plant fermentation process, which is a bio-renewable resource with low price. Because of the direct electrochemical oxidation of methanol, the system is relatively simple, and it is e...

Claims

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Application Information

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IPC IPC(8): H01M4/96B01D69/12B01D71/66
CPCY02E60/50
Inventor 杨勇李涛程琥
Owner XIAMEN UNIV
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