Fuel battery catalyzer layer and fuel cell chip based on multi-hold base and its making method

Abstract

The present invention relates to a fuel cell catalyst layer and a fuel cell chip based on a porous matrix and a preparation method thereof. The catalyst layer comprises a porous proton exchange membrane and catalyst or proton exchange resin, wherein, the catalyst and the proton exchange resin are positioned inside a micropore of the porous proton exchange membrane; the porous proton exchange membrane is formed by a proton exchange resin monomer containing sulfonic acid group; the catalyst is supported precious metal simple substance or precious metal alloy, or the catalyst is supported precious metal simple substance or precious metal alloy after oxidation treatment; a carrier is nanometer conductive carbon black, etc. The preparation method of the catalyst layer comprises the following steps of preparing catalyst slurry, dipping the porous proton exchange membrane into the catalyst slurry, drying the membrane, thermally pressing and molding the membrane. The method of using the catalyst layer to prepare the fuel cell chip comprises the following steps of orderly arranging one polytetrafluoroethylene film, one catalyst layer, one proton exchange membrane, one catalyst layer and one polytetrafluoroethylene film into a five-in-one stack part; thermally pressing the stack part, cooling the stack part to room temperature, stripping away the polytetrafluoroethylene films on the outer side and obtaining the chip.

Description

technical field [0001] The invention relates to a novel fuel cell catalyst layer based on a porous proton exchange membrane. By combining the catalyst layer and the proton exchange membrane into a fuel cell chip (catalyst coated membrane, CCM), a high-performance fuel cell can be obtained. Background technique [0002] At present, the most basic components of the fuel cell catalyst layer are mainly catalysts, proton conductors and binders, etc. The catalysts are usually Pt / C catalysts, the proton conductors are perfluorosulfonic acid resins (such as Nafion, etc.), and the binders can be all Fluorosulfonic acid resin, also can be hydrophobic agent such as polytetrafluoroethylene (PTFE). The fuel cell catalyst layer is an important place for electrochemical catalysis and reaction of the fuel cell, so its catalytic efficiency largely determines the performance of the fuel cell. The key to improving the catalytic efficiency of the catalyst layer is to increase the three-phase r...

AI Technical Summary

Problems solved by technology

However, like traditional MEA, CCM also faces the problem of flooding electrodes, especially when using ultra-thin proton exchange membranes, the problem of back-diffusion water is more prominent, which affects the diffusion of reaction gases in porous diffusion layers and catalysts. Decrease the stability of the fuel cell