A method for improving the carbinol-resisting infiltration of fluorine-containing sulfonic acid proton exchange film

A technology of proton exchange membrane and fluorine-containing sulfonic acid, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems such as difficult control of quantity and shape, and achieve reduced methanol permeability, good electrical conductivity, The effect of improving the resistance to methanol penetration

Inactive Publication Date: 2007-10-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Pickup et al found that Nafion  The membrane is dipped into the aqueous solution of pyrrole monomer, and then the polypyrrole is polymerized into Nafion in situ  On the membrane, although it was found that the alcohol resistance performance of the membrane decreased by nearly 90% when the electrical conductivity of the membrane decreased by 50% (Modification of Nafion proton exchange membranes to reduce methanol crossover in PEM fuel cells, Electrochemical and Solid-State Letters, 2000, 3, 529- 531), but polypyrrole in Nafion  The amount and shape on the membrane are not easy to control

Method used

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  • A method for improving the carbinol-resisting infiltration of fluorine-containing sulfonic acid proton exchange film
  • A method for improving the carbinol-resisting infiltration of fluorine-containing sulfonic acid proton exchange film
  • A method for improving the carbinol-resisting infiltration of fluorine-containing sulfonic acid proton exchange film

Examples

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Embodiment 1

[0027] Example 1: Perfluorosulfonic acid type proton exchange membrane Nafion  117 anti-methanol penetration treatment

[0028] 1) The perfluorosulfonic acid type proton exchange membrane Nafion  117 film (produced by DuPont, USA, with a film thickness of about 178 microns and a molar mass of 1100) placed in 5wt% H 2 o 2 , 1mol / L of H 2 SO 4 and deionized water for 30 minutes each to obtain the pretreated perfluorosulfonic acid proton exchange membrane Nafion  117;

[0029] 2) The pretreated perfluorosulfonic acid proton exchange membrane Nafion  117 is placed in the middle of the diffusion cell, one side is an aqueous solution of pyrrole monomer with a concentration of 0.1mol / L, and the other side is FeCl with a concentration of 0.5mol / L 3 Aqueous solution, after polymerization at 25°C for 1, 3, 5, 10, and 15 hours, then take out H at 1mol / L in sequence 2 SO 4 Soak in deionized water for 30 minutes each to obtain Nafion, a perfluorosulfonic acid proton exchange m...

Embodiment 2

[0033] Example 2: Perfluorosulfonic acid-type proton exchange membrane Nafion  112 anti-methanol penetration treatment

[0034] 1) The perfluorosulfonic acid type proton exchange membrane Nafion  112 (produced by U.S. DuPont company, film thickness is about 50 microns, molar mass 1100) placed in 5wt% H 2 o 2 , 1mol / L of H 2 SO 4 and deionized water for 30 minutes each to obtain the pretreated perfluorosulfonic acid proton exchange membrane Nafion  112;

[0035] 2) The pretreated perfluorosulfonic acid proton exchange membrane Nafion  112 is placed in the middle of the diffusion cell, one side is an aqueous solution of pyrrole monomer with a concentration of 1mol / L, and the other side is H with a concentration of 1mol / L 2 o 2 Aqueous solution, after polymerization at 25°C for 5, 10, 15, and 20 hours, then take out H at 1mol / L in sequence 2 SO 4 Soak in deionized water for 30 minutes each to obtain Nafion, a perfluorosulfonic acid proton exchange membrane resistant...

Embodiment 3

[0038] Example 3: Anti-methanol permeation treatment of perfluorosulfonic acid type proton exchange membrane CHFM10125

[0039] 1) Place the perfluorosulfonic acid type proton exchange membrane CHFM10125 (produced by Shandong Dongyue Group, with a membrane thickness of about 125 microns and a molar mass of 1000) in 5 wt% H 2 o 2 , 1mol / L of H 2 SO 4 and deionized water for 30 minutes each to obtain a pretreated perfluorosulfonic acid proton exchange membrane CHFM10125;

[0040] 2) Place the pretreated perfluorosulfonic acid proton exchange membrane CHFM10125 in the middle of the diffusion cell, one side is an aqueous solution of thiophene monomer with a concentration of 0.008mol / L, and the other side is Na with a concentration of 2mol / L 2 S 2 o 8 Aqueous solution, after polymerization at 60°C for 5, 10, 15, and 20 hours, then take out H at 1mol / L in sequence 2 SO 4 and deionized water respectively soaked for 30 minutes to obtain perfluorosulfonic acid type proton exchan...

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Abstract

The invention discloses a method for raising the anti-carbinol permeability of the proton exchange membrane containing fluorine sulfonic. The method is to put the proton exchange membrane containing fluorine sulfonic in the diffusion pool; use the mutual electrostatic action between the sulfonic group and conducting polymer monomers, which makes the conducting polymer monomers cross the proton exchange membrane containing fluorine sulfonic to the oxidizing agent side of the diffusion pool; and by a method of chemical polymerization diffusion in-situ, the conducting polymer monomers polymerized inside the proton exchange membrane containing fluorine sulfonic or on the facial sulfonic group cluster; under the conditions of few decreases in the electrical conductivity, the anti-carbinol permeability may be efficiently raised, and the carbinol transmission factor can be reduced by 1 to 2 magnitudes.

Description

Technical field: [0001] The invention relates to a method for improving the methanol permeation resistance of a fluorine-containing sulfonic acid type proton exchange membrane. Background technique: [0002] Fuel cell technology is a representative of the new generation of green energy technology. It has the advantages of cleanliness, high efficiency, and good reliability. It has become one of the hot spots of international high-tech competition. Compared with the hydrogen / oxygen (empty) fuel cell that uses hydrogen as fuel, Direct Methanol Fuel Cell (DMFC) uses methanol as fuel. Since methanol is liquid at room temperature, it is safer and more reliable, and Fuel is easy to store and transport, and fuel replenishment is convenient. Methanol can be directly obtained by plant fermentation, and is a biorenewable resource with low price. Because of the direct electrochemical oxidation of methanol, the system structure is simple and compact, and it is easier to integrate and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/94H01M8/02H01M8/10B01D71/66B01D67/00H01M8/1011H01M8/1018H01M8/1069
CPCY02E60/522Y02E60/50
Inventor 李磊张永明
Owner SHANGHAI JIAO TONG UNIV
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