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Preparation method of Nafion/mesoporous silicon dioxide composite proton exchange film

A technology of mesoporous silica and proton exchange membrane, which is applied in the fields of final product manufacturing, electrochemical generator, sustainable manufacturing/processing, etc., and can solve problems such as poor modification effect, low proton conductivity, and high methanol permeation , to achieve the effects of easy scale-up preparation, simple and easy method, and mild reaction conditions

Active Publication Date: 2008-12-10
中科应化(长春)科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the shortcomings of high methanol permeation of commercial Nafion proton exchange membranes, low proton conductivity when the temperature range is 20°C-80°C, and the traditional method of modifying Nafion membranes is complicated and the modification effect is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Add 0.5 mol of Pluronic P123 into 100 ml of tetraethoxysilane ethanol solution, the concentration of tetraethoxysilane is 0.5 mol / L, adjust the pH value to 2, and then sonicate for 30 minutes. The Nafion 117 membrane was immersed in the above-mentioned silicon source sol at a rate of 30mm / s, and then the silicon source sol was pulled out at this rate. At this time, the silicon source sol is adsorbed on the surface of Nafion 117 membrane. After the membrane coated with the silicon source sol is aged at 10° C. for 2-6 hours in the air, the composite membrane is washed with ethanol for 3 times to remove the surfactant. A Nafion / mesoporous silica composite proton exchange membrane was obtained. The surface of the obtained composite membrane has a network structure of nano-scale mesoporous silica. It can effectively block the penetration of methanol. The proton conductivity of the composite membrane remains at the same order of magnitude as that of the Nafion m...

Embodiment 2

[0012] Example 2: Add 0.005 mol of Pluronic F127 into 1000 ml of tetraethoxysilane ethanol solution, the concentration of tetraethoxysilane is 0.5 mol / L, adjust the pH value to 2, and then sonicate for 30 minutes. The Nafion 115 membrane is immersed in the above-mentioned silicon source sol at a rate of 100 mm / s, and then the silicon source sol is pulled out at this rate. At this time, the silicon source sol is adsorbed on the surface of Nafion 112 membrane. Thereafter, the above-mentioned immersion and lifting process was repeated after an interval of 5 minutes, and was repeated 4 times in total. After the film coated with the silicon source sol is aged at 15° C. in the air at room temperature for 2-6 hours, the composite film is cleaned with ethanol for 3 times to remove the surfactant. A Nafion / mesoporous silica composite proton exchange membrane was obtained. The surface of the obtained composite membrane has a network structure of five layers of nano-scale mesoporous si...

Embodiment 3

[0013] Example 3 0.01 mol of CTAB was added to 200 ml of tetraethoxysilane ethanol solution, the concentration of tetraethoxysilane was 0.5 mol / L, the pH value was adjusted to 3, and then ultrasound was performed for 30 minutes. The Nafion 112 film is immersed in the above-mentioned silicon source sol at a rate of 120mm / s, and then the silicon source sol is pulled out at this rate. At this time, the silicon source sol is adsorbed on the surface of Nafion 112 membrane. Thereafter, the above-mentioned immersion and pulling process was repeated after an interval of 60 minutes, and was repeated twice in total. After the film coated with the silicon source sol is aged in the air at 25° C. for 2-6 hours, the composite film is washed with ethanol three times to remove the surfactant. A Nafion / mesoporous silica composite proton exchange membrane was obtained. The surface of the obtained composite membrane has a network structure of three layers of nano-scale mesoporous silica. The ...

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Abstract

The invention provides a method for production of Nafion / mesoporous silicon dioxide composite proton exchange film. By using the method of dip-coating in situ, silica sol comprising a surfactant is coated on the surface of Nafion film by pulling to obtain the Nafion / mesoporous silicon dioxide composite proton exchange film. Alcohol-resisting performance of a hybridized film and the proton conducting performance are controlled by varying type and concentration of the surfactant, speed rate and times of the dip-coating pulling, and the interval time among several dip-coating pulling. The surface of the obtain composite film includes a nanometer network structure of the mesoporous silicon dioxide, which can efficiently block methanol from penetration, meanwhile, on account of hydrophilic property of the mesoporous silicon dioxide, the proton conducting rate of the composite film still remains as equivalent as that of the Nafion film or even higher than that of the Nafion film. The above characteristics endow the composite film with a quite extensive prospect in applying to direct methanol fuel battery.

Description

technical field [0001] The invention relates to a preparation method of a Nafion / mesoporous silicon dioxide composite proton exchange membrane. Background technique [0002] Energy is one of the necessary conditions for the survival and development of human society. Mineral energy is facing exhaustion, and the era of clean energy represented by hydrogen energy has arrived. The concept of clean energy is mainly based on fuel cell technology. Direct methanol fuel cells (DirectMethanol Fuel Cells, DMFC) directly use methanol aqueous solution as fuel, use oxygen or air as oxidant, generally work in the range of 20 ℃ -80 ℃, with high efficiency, safety, relatively small size, no noise, No pollution and other advantages. The above-mentioned characteristics make direct methanol fuel cells attract extensive attention. The core component of a direct methanol fuel cell is a solid proton exchange membrane (Proton Exchange Membrane, PEM), also known as an electrolyte membrane. It is...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M2/16C08J5/22H01M8/1069
CPCY02E60/50Y02P70/50
Inventor 林驭寒李海东刘桂华薛彦虎聂伟姬相玲
Owner 中科应化(长春)科技有限公司
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