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
0 Cites 11 Cited by

AI-Extracted 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 ...
View more

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.

Application Domain

Final product manufactureCell component details +1

Technology Topic

ChemistryElectrical resistivity and conductivity +12

Examples

  • Experimental program(7)

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 membrane.

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 permeability of the composite membrane is 10 times lower than that of the unmodified membrane, while the proton conductivity remains at the same order of magnitude as that of the Nafion membrane.

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 membrane is 2 times lower than that of the unmodified membrane, while the proton conductivity remains comparable to that of the Nafion membrane.

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Similar technology patents

Method for preparing epoxy compound by oxidating olefin or cycloolefine through bionic catalysis oxygen

InactiveCN1915983Amild reaction conditionsReduce reaction temperature and pressure
Owner:SOUTH CHINA UNIV OF TECH

Method for preparing immobilized enzyme on surface of polymer base material

ActiveCN102925425Amild reaction conditionsfavors enzyme activity
Owner:BEIJING UNIV OF CHEM TECH

Seashells seafood flavorings

Owner:NANJING AGRICULTURAL UNIVERSITY

Method for preparing proton exchange membrane fuel cell supported catalyst

Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Classification and recommendation of technical efficacy words

  • The method is simple and easy
  • mild reaction conditions

Gradient nano-coating used for thermal barrier coating anti-corrosion function and preparation method thereof

InactiveCN103058654AOvercoming differences in thermal expansion coefficientsThe method is simple and easy
Owner:SHANGHAI UNIV

Online safety pre-warning method for lithium-ion battery

ActiveCN105742729AThe method is simple and easyAccurate and efficient early warning
Owner:STATE GRID CORP OF CHINA +2

Method for ion liquid abstraction-catalytic oxidation desulfurization

InactiveCN101220293Amild reaction conditionsGood catalytic activity and selectivity
Owner:CRPC INNOVATION ENERGY

Method for producing 1,3-propanediol

ActiveCN101747150Amild reaction conditionsHigh catalyst activity
Owner:SYNFUELS CHINA TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products