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Anti-degradation enhanced proton exchange membrane and preparation method thereof

A proton exchange membrane and enhanced technology, applied in the field of enhanced proton exchange membrane and its preparation, can solve the problems of poor compatibility between oxides and ionic polymers, increase the overall cost of proton exchange membrane, and high price, and achieve anti-freedom Improvement of radical degradation performance, reduction of membrane electrode aging effects, good free radical reduction effect

Active Publication Date: 2021-01-22
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The free radical quencher used is CeO 2 or MnO 2 One or two of them, but the problem is that due to the poor compatibility of oxides and ion polymers, in order to fully disperse these metal oxides inside the proton membrane, which is only a dozen microns, the particle size needs to be The size distribution is uniform and the particle size is small, and the purity of the material is extremely high, which greatly increases the overall cost of the proton exchange membrane
However, the basicity and acidity of amines will cause neutralization reactions. Therefore, Schiff base phenolic amines are not stable enough in the strong acidic system of perfluorosulfonic acid proton exchange membranes.
[0004] At present, the application of free radical quenchers is mainly concentrated on variable-valence metal oxide nanoparticles, such as cerium oxide, manganese oxide, titanium oxide, etc., but the perfluorosulfonic acid proton exchange membrane is a strong acid in the presence of water. system, therefore, these variable-valence metal oxides have the risk of dissolution, and the metal ions generated after dissolution will reduce the ionic conductivity and mechanical strength of the proton exchange membrane, and the compatibility with the perfluorosulfonic acid proton exchange membrane is poor
In addition, organic compounds synthesized in the laboratory are used as free radical quenchers, which are expensive and risky to the environment

Method used

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  • Anti-degradation enhanced proton exchange membrane and preparation method thereof
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Examples

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Effect test

Embodiment 1

[0033] A method for preparing an anti-degradation enhanced proton exchange membrane, comprising the steps of:

[0034] 1) Preparation of casting solution: Disperse 5g of H-type perfluorosulfonic acid resin in isopropanol / water mixture, add 0.05g of vitamin C, place in a hydrothermal reaction kettle and heat to dissolve at 180°C for 6h to obtain free radical quencher compound perfluorosulfonic acid solution, add 30ml DMF to the free radical quencher compound perfluorosulfonic acid solution and carry out vacuum distillation to obtain the casting solution;

[0035] 2) Cleaning and pore activation of the reinforcing material: Soak the ePTFE membrane of the reinforcing material in ethanol to remove organic matter on the surface, and place the treated ePTFE membrane in a free radical quencher compound perfluorosulfonic acid solution for ultrasonic treatment for 1 hour;

[0036] 3) Scrape coating: place the ePTFE film treated in step 2) on a glass plate with a flat surface, then pour...

Embodiment 2

[0038] A method for preparing an anti-degradation enhanced proton exchange membrane, comprising the steps of:

[0039] 1) Preparation of casting solution: disperse 5g of H-type perfluorosulfonic acid resin in isopropanol / water mixture, add 0.05g of vitamin A, place in a hydrothermal reaction kettle and heat at 180°C for 6h to obtain free Radical quencher composite perfluorosulfonic acid solution, add 30ml DMF to the free radical quencher composite perfluorosulfonic acid solution and carry out vacuum distillation to obtain the casting solution;

[0040]2) Cleaning and pore activation of the reinforcing material: Soak the ePTFE membrane of the reinforcing material in ethanol to remove organic matter on the surface, and place the treated ePTFE membrane in a free radical quencher compound perfluorosulfonic acid solution for ultrasonic treatment for 1 hour;

[0041] 3) Scrape coating: place the ePTFE film treated in step 2) on a glass plate with a flat surface, then pour the castin...

Embodiment 3

[0051] A method for preparing an anti-degradation enhanced proton exchange membrane, comprising the steps of:

[0052] 1) Preparation of casting solution: Disperse 5g of SFPEEK in isopropanol / water mixture, add 0.05g of vitamin E, place in a hydrothermal reaction kettle and heat at 180°C for 6h to obtain vitamin E complex SFPEEK solution, Add 30ml DMA to the vitamin E complex SFPEEK solution and carry out vacuum distillation to obtain the casting solution;

[0053] 2) Cleaning and pore activation of the reinforcing material: Soak the PI film of the reinforcing material in ethanol to remove the organic matter on the surface, and place the treated PI film in a vitamin E compound SFPEEK solution for ultrasonic treatment for 1 hour;

[0054] 3) Scrape coating: place the PI film treated in step 2) on a glass plate with a flat surface, then pour the casting solution prepared in step 1) on the surface of the reinforcing material, and use a scraper coating machine with a scrape gap of...

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Abstract

The invention belongs to the technical field of fuel cells, and particularly relates to an anti-degradation enhanced proton exchange membrane and a preparation method thereof. A membrane casting solution containing a vitamin free radical quencher is applied to a reinforcing material in a blade coating mode until a membrane is formed. According to the invention, the prepared proton exchange membrane is higher in anti-degradation performance. According to the method, the vitamin compound is used as the free radical quencher carried by the proton exchange membrane for the first time, the free radical quencher is cheap, easy to obtain and small in harm to the environment; meanwhile, the free radical reducibility is good, the free radical degradation resistance is improved, vitamins can be reduced through hydrogen permeation of the proton exchange membrane, and repeated utilization of the free radical quencher is achieved; and the influence of the hydrogen permeation phenomenon on the agingof the membrane electrode of the fuel cell is also reduced.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to an anti-degradation enhanced proton exchange membrane and a preparation method thereof. Background technique [0002] The proton exchange membrane (PEM) in a fuel cell is a solid electrolyte membrane whose function is to isolate fuel and oxidant and to transfer protons (H + ). In practical applications, proton exchange membranes are required to have good chemical and mechanical stability. At present, the commonly used industrial proton exchange membrane is perfluorosulfonic acid membrane. The main chain of fluorocarbons is hydrophobic, and the sulfonic acid end group (-SO3H) of the side chain part is hydrophilic, so microphase separation will occur in the membrane. When the membrane is wet, the hydrophilic phase aggregates together to form a network of ion clusters, which conduct protons. Currently, proton exchange membranes used in vehicles are gradually becom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1041H01M8/1069H01M8/1086
CPCH01M8/1041H01M8/1069H01M8/1086Y02E60/50
Inventor 白亚峰冯勇薛峰杨代辉陈果石斌
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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