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Process for preparing self-humidifying composite proton exchange film for fuel cell

A proton exchange membrane and fuel cell technology, which is used in fuel cell parts, fuel cells, solid electrolyte fuel cells, etc., can solve the problems of ineffective self-humidification operation and limited penetration, and achieve improved flexibility and The effect of compactness, ease of operation, good mechanical properties

Inactive Publication Date: 2003-12-31
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But with thick film (Nafion115), the H itself 2 and O 2 The amount of permeation through the membrane is limited, making the effect of the entire self-humidification operation insignificant

Method used

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  • Process for preparing self-humidifying composite proton exchange film for fuel cell
  • Process for preparing self-humidifying composite proton exchange film for fuel cell
  • Process for preparing self-humidifying composite proton exchange film for fuel cell

Examples

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Embodiment 1

[0043] A mixed solvent of low-boiling organic alcohols (methanol, isopropanol, propanol) and water was used to heat and dissolve the corners of Nafion film (EW=1100) in a closed reaction kettle to prepare a 5% perfluorosulfonic acid solution. Weigh 17g Nafion solution, then press 0.06mgPt / cm 2 Add a certain amount of 20% Pt / C catalyst in a small beaker, add 2g of DMSO dropwise, and vibrate in ultrasonic for 20 minutes to make the catalyst disperse evenly. Cut out a piece of 10×11cm 2 A polytetrafluoroethylene (PTFE) porous membrane with a thickness of 15 μm, the SEM scanning electron micrograph of the porous membrane is shown in the attached figure 2 ; Soak in ethanol solution to remove organic matter on the surface. Then spread the PTFE porous membrane on a flat glass, and add the Nafion solution prepared above adding the Pt / C catalyst dropwise. Put it on a 50°C hot stage, and after one hour, the temperature was raised to 75°C, and after one hour, the temperature was rais...

Embodiment 2

[0052] The three-in-one perfluorosulfonic acid composite membrane and membrane electrode were prepared by the method of Example 1, except that the thickness of the porous PTFE membrane used was 5 μm. 0.06mg Pt / cm in Nafion solution 2 The amount of Pt / C catalyst was added to make a self-humidifying composite membrane with a thickness of 35 μm. The membrane-electrode three-in-one is prepared by hot pressing the membrane. The assembled PEMFC was tested for battery performance on a single-cell evaluation device. The polarization curve of the test battery under humidified and non-humidified conditions is shown in the appendix Figure 6 .

[0053] The effect that the present invention has:

[0054] 1. The invention can realize stable operation under the condition of no external humidification, can simplify or cancel the pure water humidification system, can reduce the complexity of the system, improve the energy efficiency of the battery, and reduce the cost of the battery, whic...

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Abstract

The present invention discloses a process for preparing self-humidifying composite proton exchange membrane for fueling battery comprising, adding heat dissolving all fluorosulfuric acid film into the low boiling point organic alcohol and water dissolvent, forming all fluorosulfuric acid resin solution, adding the carrying type catalyst and high boiling point organic dissolvent containing Pt into the all fluorosulfuric acid resin solution, dropping the solution on the surface of the organic porous membrane, heating up and storing under vacuum.

Description

technical field [0001] The invention relates to a method for preparing a proton exchange membrane, in particular to a method for preparing a self-humidifying composite proton exchange membrane for a fuel cell. Background technique [0002] In recent years, the research on proton exchange membrane fuel cell (PEMFC) as a power source has become a hot spot in the field of electrochemistry and energy science. PEMFC generally uses a perfluorosulfonic acid polymer proton exchange membrane (PEM) such as Nafion membrane as a solid electrolyte. An ideal PEM should have high proton conductivity, low gas permeability, high enough mechanical strength, thermal stability and chemical stability. , proper performance and price ratio. The presence of water is required for PEM to conduct protons, and its conductivity is almost linear with its water content. Moreover, the uniform hydration of the entire proton exchange membrane can prevent local dehydration of the membrane, or local hot spot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0243H01M8/10
CPCY02E60/522Y02E60/50
Inventor 刘富强衣宝廉邢丹敏于景荣张华民
Owner SUNRISE POWER CO LTD
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