Fuel battery proton exchange film with anti-penetration layer and its making method

A proton exchange membrane and fuel cell technology, applied in fuel cells, fuel cell parts, solid electrolyte fuel cells, etc., can solve problems such as increasing the proton migration resistance of proton exchange membranes

Inactive Publication Date: 2011-05-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of a three-layer porous polymer reinforced composite proton exchange membrane, the hydrophobic characteristics of the base membrane are not fundamentally changed, so that the reaction gas may still permeate along the hydrophobic framework region, and this method will increase the proton exchange rate to a certain extent. Proton migration resistance of exchange membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of reverse osmosis membrane based on porous perfluorosulfonic acid proton exchange membrane

[0024] 1. Mix 1 ml of 5wt% perfluorosulfonic acid resin solution (Nafion Solution, produced by DuPont Company), 5 grams of Pt / C (10wt%) catalysts were dispersed in 100 milliliters of 10% isopropanol aqueous solution, and stirred at a high speed (10,000 revolutions per minute) under vacuum conditions for 10 minutes to obtain catalyst material pulp.

[0025] 2. Preparation of perfluorosulfonic acid porous membrane

[0026]Concentration is that 400 milliliters of perfluorinated sulfonic acid resin solutions (solvent is 30% ethanol, 70% isopropanol) of 5% are poured into the glass vessel that length, width, height are respectively 10cm, 10cm, 5cm, then at a temperature of 80 Vacuum drying at ±10°C for 12 hours to obtain a cast film. Lift the casting film from the surface of the glass and hot-press at a temperature of 110±10°C and a pressure of 2MPa. Cut the hot-pre...

Embodiment 2

[0032] Preparation of Methanol Permeation Resistance Membrane Based on Porous Sulfonated Polyetheretherketone Membrane

[0033] 1. PtRu / CNT (CNT is referred to as carbon nanotube, Pt loading 40wt%) catalyst and 71% HNO 3 The oxidants are mixed, heated and refluxed at 85±5°C for 3 hours, then filtered, washed with deionized water, and vacuum-dried at 80±10°C for 24 hours. Take 0.5 g of the oxidized catalyst, disperse it in 50 ml of 15% ethanol aqueous solution, and stir it at high speed (10,000 rpm) under vacuum for 15 minutes to prepare catalyst slurry.

[0034] 2. Preparation of sulfonated polyether ether ketone porous membrane

[0035] 600 milliliters of sulfonated polyether ether ketone solution (solvent is propanol) that sulfonation degree is 65%, concentration is 20% is poured in the glass container of the same size as embodiment 1, then at a temperature of 80 ± 10 ℃ Under the condition of vacuum drying for 24 hours, a casting film was obtained. Lift the cast film from...

Embodiment 3

[0041] Preparation of reverse osmosis membrane based on porous perfluorosulfonic acid membrane

[0042] 1. Get 1 gram of PtCr (Pt loading 50wt%) unsupported catalyst, disperse it in 80 milliliters of 1% aqueous methanol, and stir it at high speed (10,000 rpm) under vacuum for 25 minutes to prepare catalyst slurry.

[0043] 2. The preparation of the perfluorosulfonic acid porous membrane is the same as in Example 1.

[0044] 3. Take a prepared porous perfluorosulfonic acid proton exchange membrane with a membrane thickness of 5 μm, a porosity greater than 85%, and an average pore diameter of 1.2 μm. Immerse the membrane in the catalyst slurry for 8 minutes under vacuum conditions, and take out Vacuum dry. Repeat the above impregnation-drying process once. Then, the membrane was boiled in 0.5M H2SO4 solution for 1.5 hours, soaked in deionized water, washed and dried in vacuum. Finally, the filled porous proton exchange membrane is hot-pressed at a temperature of 145±5° C., a ...

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PUM

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Abstract

The present invention relates to a fuel cell proton exchange membrane having an anti-permeation layer and a preparation method thereof. The membrane has an anti-permeation membrane or layer compounded between two porous polymer matrix proton exchange membranes. The anti-permeation membrane or layer consists of a porous proton exchange membrane matrix and a filling body; the filling body is catalyst, or catalyst and proton exchange resin. The preparation method of the present invention comprises the following steps: the filling body material is dispersed in solvent, or 1-20wt percent of protonexchange resin is added in, so as to obtain catalyst slurry; a porous proton exchange membrane is dipped in the catalyst slurry, taken out, dried, boiled in H2SO4 solution, soaked in ion removing water, washed, dried and thermally pressed, obtaining the anti-permeation membrane or layer; the porous polymer matrix proton exchange membranes and anti-gas-permeation membrane are stacked in up-down alignment in the order of one porous polymer matrix proton exchange membrane, one anti-gas-permeation membrane and one porous polymer matrix proton exchange membrane; two polytetrafluoroethylene films in the same size are respectively arranged on the bottom and the upper part of the three stacked membranes; the three stacked membranes are thermally pressed and have the polytetrafluoroethylene films on the surface layer stripped away, and then the fuel cell proton exchange membrane having an anti-permeation layer can be obtained.

Description

technical field [0001] The invention relates to an enhanced proton exchange membrane for direct hydrogen or methanol fuel cells and a preparation method. The proton exchange membrane has low gas or methanol permeability and is beneficial to improving the performance of the fuel cell. Background technique [0002] Proton Exchange Membrane (PEM) is one of the core components of PEMFC. The perfluorosulfonic acid proton exchange membrane (Nafion®) produced by DuPont is commonly used at present. Membrane), the membrane has relatively good proton conductivity and long service life. However, the disadvantages of this kind of film are that the synthesis route is long, the processing technology is complicated, the price is expensive, and it will easily swell and deform after absorbing water, and the mechanical strength will decrease. Moreover, when used in a direct methanol fuel cell (DMFC), it has high methanol permeability, which greatly reduces the performance of the fuel cell....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M8/10H01M2/16C08J5/22H01M8/0258H01M8/0289H01M8/1011H01M50/411H01M50/414H01M50/417
CPCY02P70/50Y02E60/50
Inventor 木士春王晓恩潘牧
Owner WUHAN UNIV OF TECH
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