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Polymer supershort fiber reinforced fuel cell proton exchange membrane and its preparing method

A technology of proton exchange membranes and ultra-short fibers, which is applied in the field of proton exchange membranes doped with polymer ultra-short fibers and its preparation, can solve the problems of accelerated leakage of reaction gases, difficult to 100% filling of proton exchange resins, etc., to achieve Improve performance and durability, good mechanical strength and dimensional stability, reduce the effect of penetration

Inactive Publication Date: 2007-11-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this type of membrane is that its oxygen permeability coefficient is higher than that of perfluorosulfonic acid homogeneous membranes (such as DuPont's Nafion membrane), because oxygen can be transferred and diffused through the hydrophobic polymer fluorocarbon backbone. , while the former has a larger PTFE content, which determines the high oxygen permeability; in addition, it is usually difficult to achieve a 100% filling of the proton exchange resin, which provides a hidden danger for the accelerated leakage of the reaction gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of PTFE Ultrashort Fiber Reinforced Proton Exchange Membrane

[0018] Weigh 3 parts of 0.1 gram PTFE ultra-short fibers, add 1 gram of deionized water, and add 10 mg of sodium polyphosphate dispersant, ultrasonically disperse for 10 minutes, and then disperse with high-speed stirring (10,000 rpm) for 40 minutes to obtain PTFE Ultra-short fiber dispersion, the ultra-short fiber has a diameter of 0.05-0.1 microns and a fiber length of 25-50 microns;

[0019] The prepared PTFE ultra-short fiber dispersion was respectively added to 3 parts of 5% Nafion solution, ultrasonically dispersed for 30 minutes, and stirred at high speed under vacuum for 20 minutes to prepare a blend. In the blend liquid, the mass fractions of PTFE ultra-short fibers are respectively 0.01%, 0.1%, and 1%, and the rest are mass fractions of proton exchange resins. Then cast the blended solution into a polytetrafluoroethylene mold placed horizontally, and after vacuum drying at 80±10°C for ...

Embodiment 2

[0025] Preparation of PET Ultrashort Fiber Reinforced Proton Exchange Membrane

[0026] Weigh 3 parts of 0.1 g of PP ultra-short fibers, add 5 g of deionized water, and add 50 mg of sodium polyacrylate dispersant, ultrasonically disperse for 30 minutes, and then stir at high speed (10,000 rpm) for 20 minutes to obtain PP ultra-short fibers. Short fiber dispersion, ultra-short fibers have a diameter of 0.1 to 1 micron and a fiber length of 100 to 500 microns;

[0027] The prepared ultra-short fiber dispersion was respectively added to 3 parts of 5% Nafion solution, ultrasonically dispersed for 10 minutes, and stirred at high speed for 40 minutes under vacuum to prepare a blend. Among them, the mass fractions of ultra-short fibers are respectively 0.01%, 0.1%, and 1%, and the rest are the mass fractions of proton exchange resins. Then the blend solution was cast into a polytetrafluoroethylene mold placed horizontally, and after vacuum drying at 80±10°C for 15 hours, the film wa...

Embodiment 3

[0032] Preparation of PET Ultrashort Fiber Reinforced Proton Exchange Membrane

[0033] The preparation steps are:

[0034] Weigh 3 parts of 0.1 gram PET ultra-short fibers, add 2.5 grams of deionized water, and add 25 mg of 30% sodium polyphosphate+70% sodium polyacrylate compound dispersant, ultrasonically disperse for 15 minutes, stir at high speed (10,000 rpm / minute) 30 minutes, made PET ultra-short fiber dispersion liquid, and the diameter of ultra-short fiber is 0.1~1 micron, and fiber length is 50~100 micron;

[0035] The prepared ultra-short fiber dispersion was respectively added to 3 parts of 5% Nafion solution, ultrasonically dispersed for 20 minutes, and vacuum stirred at high speed for 25 minutes to obtain a blend. Among them, the mass fractions of ultra-short fibers are respectively 0.01%, 0.1%, and 1%, and the rest are the mass fractions of proton exchange resins. Then the blend solution was cast into a polytetrafluoroethylene mold placed horizontally, and a...

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Abstract

The invention provides a polymer ultra short fiber enhancement fuel cell proton exchange membrane and its preparation method. In this proton exchange membrane the polymer ultra short fiber mass percent is 0.01%-5%,others are proton exchange resin mass percent, the polymer ultra short fiber diameter is 0.01-1 micro meter, the length usually is 0.01-500 microns. The preparation craft is: 1) add the polymer ultra short fiber dispersion liquid in solvent, add dispersing agent to prepare dispersion liquid 2) add the polymer ultra short fiber dispersion fluid to the proton exchange resin solution for dispersing to obtain blend liquid of polymer ultra short fiber and proton exchange resin 3) pour cast the blend liquid into the Teflon casting membrane horizontally placed, dry and strip the membrane, boil in the H2SO4 solution, wash by deionized water to obtain the polymer ultra-short fiber reinforced proton exchange membrane. Advantes: good mechanicl strength and size stability, reduced filtration of cathode reaction gases and raised performance and durability of fuel cell.

Description

technical field [0001] The invention relates to a proton exchange membrane for a proton exchange membrane fuel cell and a preparation method thereof, in particular to a proton exchange membrane doped with ultra-short polymer fibers and a preparation method thereof. The prepared proton exchange membrane has better mechanical strength and Dimensional stability. Background technique [0002] Proton exchange membrane fuel cell is a power generation device that directly converts chemical energy into electrical energy by electrochemical means, and is considered to be the preferred clean and efficient power generation technology in the 21st century. This is because the fuel cell is not limited by the Carnot cycle, and the energy conversion efficiency is high; and because it is H 2 and O 2 The chemical reaction, the product of which is water, achieves zero discharge. [0003] However, to realize the industrialization of fuel cells, there are still many problems to be solved. One...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M8/10H01M2/16H01M4/94H01M4/88H01M8/0202H01M8/1018H01M8/1069H01M50/417H01M50/44H01M50/489
CPCY02E60/522Y02E60/12Y02E60/523Y02E60/50
Inventor 木士春高莹潘牧
Owner WUHAN UNIV OF TECH
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