Mehtod for preparing core assembly for proton exchange membrane fuel cell with adjustable hydrophilicity and hydrophobicity

Abstract

This invention relates to preparation method of core components used in proton exchanging film fuel battery. It is preparation method of core components used in philic hydrophobicity adjustable proton exchanging film fuel battery. The procedures are that 1) slime making, weight ratio 0.1:1 to 1:0.1 of proton conduction polymer and polytetrafluoroethylene are selected, 3-40 percent weight concentration proton conduction polymer solution and 60-70 percent weight concentration polytetrafluoroethylene are also selected, then they are used to make into slime. 2) The slime is silk-screen printed, cast, coated or sprayed on the medium, en solution is heated eliminated, and catalyst layer is formed on the medium. Then the proton exchanging film is set between the catalyst layers on the two media, the material of the catalyst layer is transferred printed onto the proton exchanging film through heating to get the core component used in the proton exchanging film fuel battery. The feature is that wetting angle of the component to water can be adjusted through making process, so water managing when the core component is practical applied in the fuel battery will has good adaptability.

Description

technical field [0001] The invention relates to a preparation method of a core assembly for a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high power density, high energy conversion efficiency, low temperature start-up, and environmental friendliness. Today, it has become one of the hot spots of international high-tech competition. The core component of proton exchange membrane fuel cell (catalyst coated membrane, CCM) is the core component of proton exchange membrane fuel cell that is different from the traditional membrane electrode (membrane electrode assembly, MEA) structure developed in recent years. The traditional membrane electrode (MEA) manufacturing method is mainly to transfer the catalyst to the diffusion layer to form a catalytic layer, then hot press with the proton exchange membrane, and then impregnate or spray the proton conductive resin solution on the catalytic layer. W...

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Problems solved by technology

Although this method can improve the hydrophobicity of the catalytic layer, PTFE cannot be continuously and uniformly dispersed in the catalytic layer, so it lacks the regulation of water management in fuel cell applications

[0005] In the core component (CCM) used in the existing proton exchange membrane fuel cell, the catalytic layer generally uses hydrophilic proton-conducting resin or hydrophobic polytetrafluoroethylene (PTFE) as the binder; only proton-conducting resin is used as the bonding agent When using CCM, the prepared catalytic layer is closely combined with the membrane, the catalytic layer can be made very thin, and the proton conductivity is very good, but this kind of CCM is too hydrophilic, it is difficult to adjust the water management, and it is easy to make the catalytic layer block water However, the performance of the battery drops sharply; when only polytetrafluoroethylene (PTFE, generally an emulsion) is used as a binder, the catalytic layer has good hydrophobicity, but the proton conductivity of the catalytic layer is much lower than that of using a proton-conducting polymer as an adhesive. catalytic layer

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