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Preparation method of proton exchange membrane for fuel batteries

A proton exchange membrane and fuel cell technology, which is applied to fuel cell parts, fuel cells, battery pack parts, etc., can solve the problems affecting the durability and poor chemical stability of the fuel cell system, and achieve the ability to prevent gas diffusion Strong, easy to operate, low cost effect

Inactive Publication Date: 2012-08-15
SHANGHAI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the preparation of PEM by modifying all (containing) fluoropolymers by radiation grafting has the advantages of simple operation, low cost, and controllable ion exchange capacity. Atoms, resulting in poor chemical stability, which affects the operational durability of the fuel cell system

Method used

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  • Preparation method of proton exchange membrane for fuel batteries
  • Preparation method of proton exchange membrane for fuel batteries
  • Preparation method of proton exchange membrane for fuel batteries

Examples

Experimental program
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Effect test

Embodiment

[0018] The specific process and steps in this embodiment are as follows:

[0019] a. First prepare the grafting reaction reagent system, the composition and volume concentration of the reagents in the system are: methacrylic acid (MAA for short), 30% by volume, α-methylstyrene (AMS for short), 30% by volume %, the reaction solvent is toluene, and the volume percentage is 40%.

[0020] b. Degrease the cut ETFE film, dry and weigh it, put it into a polyethylene film bag, and fill the bag with high-purity nitrogen to drive away the air, seal it and place it in an electron irradiation room for irradiation The intensity of the electron beam is 1mA, and the total irradiation dose is 150kGy; in order to weaken the effect of irradiation temperature rise, intermittent irradiation is adopted. The ethylene-tetrafluoroethylene copolymer film (ETFE) in this example is purchased from outside.

[0021] c. Add the mixed solution of AMS and MAA monomers and solvent toluene into the special g...

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Abstract

The invention relates to a preparation method of a proton exchange membrane for fuel batteries, belonging to the technical fields of high molecular material modification by radiation and electrochemistry. Co-radiation grafting technology is utilized, and an electron beam initiation mode is adopted to produce free radical active sites for initiating grafting reaction on an ETFE (ethylene tetrafluoroethylene) membrane matrix, thereby grafting the two monomers MMA (methyl methacrylate) and AMS (alpha-methylstyrene) onto the active sites. A sulfonic group with proton transmission function is introduced onto the grafting branch chain containing benzene ring by a chemical sulfonation method. In the method, the ETFE membrane is directly used as the matrix, the sulfonic group is introduced by radiation initiation, and the running membrane formation step in the copolymerization method for preparing a proton exchange membrane is saved; and thus, the invention is convenient to operate, and has the advantage of low cost. The proton exchange membrane synthesized by the method provided by the invention has the characteristics of high water absorption capacity, high water retaining capacity, good proton conductibility, strong capacity for preventing gaseous diffusion, and the like.

Description

technical field [0001] The invention relates to a method for preparing a proton exchange membrane for a fuel cell. The proton exchange membrane is prepared by modifying an ETFE membrane by using an accelerator electron beam-induced pre-irradiation grafting technology, which belongs to the radiation method modification and electrochemical technology of polymer materials. field. technical background [0002] At present, there are two main obstacles restricting the application of proton exchange membrane fuel cells (PEMFC for short): one is high cost, and the other is poor stability during long-term operation. Proton exchange membrane is the key material of fuel cell and an important factor in determining the cost, performance and durability of PEMFC. At present, scholars at home and abroad have done extensive and in-depth research on how to improve the performance of PEMFC at low preparation costs, mainly focusing on reducing the catalyst loading and preparing low-cost new pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/18C08J7/14C08L23/08C08L27/18H01M8/02H01M2/16H01M8/1072H01M8/1088
CPCY02E60/12Y02E60/50
Inventor 俎建华夏敏张剑秋史福霞
Owner SHANGHAI UNIV
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