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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  • Summary
  • Abstract
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  • 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0011] Example 1: 0.5 mol of Pluronic P123 was added to 100 ml of an ethanol solution of tetraethoxysilane, the concentration of tetraethoxysilane was 0.5 mol / L, the pH was adjusted to 2, and then it was sonicated for 30 minutes. The Nafion 117 film was immersed in the aforementioned silicon source sol at a rate of 30 mm / 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 the Nafion 117 membrane. After the film to be coated with the silicon source sol is aged in the air for 2-6 hours at 10°C, the composite film is cleaned 3 times with ethanol to remove the surfactant. The Nafion / mesoporous silica composite proton exchange membrane was obtained. The surface of the obtained composite film has a network structure of nano-scale mesoporous silica. It can effectively block the permeation of methanol. The proton conductivity of the composite membrane remains at the same order of magnitude as that of the Nafion...

Example Embodiment

[0012] Example 2: 0.005 mol of Pluronic F127 was added to 1000 ml of tetraethoxysilane in ethanol, the concentration of tetraethoxysilane was 0.5 mol / L, the pH was adjusted to 2, and then it was sonicated for 30 minutes. The Nafion 115 film was immersed in the aforementioned silicon source sol at a rate of 100 mm / 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 the Nafion 112 membrane. After that, repeat the above-mentioned immersion and pulling process after 5 minutes respectively, repeating 4 times in total. After the film coated with the silicon source sol is aged for 2-6 hours in the air at room temperature at 15° C., the composite film is cleaned 3 times with ethanol to remove the surfactant. The Nafion / mesoporous silica composite proton exchange membrane was obtained. The surface of the obtained composite film has a network structure of five layers of nano-scale mesoporous silica. The methanol ...

Example Embodiment

[0013] Example 3 0.01 mol of CTAB was added to 200 ml of tetraethoxysilane in ethanol, the concentration of tetraethoxysilane was 0.5 mol / L, the pH was adjusted to 3, and then ultrasonic for 30 minutes. The Nafion 112 film was immersed in the aforementioned silicon source sol at a rate of 120 mm / 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 the Nafion 112 membrane. After that, the above-mentioned immersion and pulling process was repeated at an interval of 60 minutes, a total of 2 times. 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 cleaned 3 times with ethanol to remove the surfactant. The 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 methanol permeability of the composite membr...

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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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