A kind of preparation method of fuel cell membrane electrode assembly

Abstract

The invention relates to a production method of a fuel cell membrane electrode assembly. The method comprises the following steps: 1, dispersing a catalyst in a mixed solvent, and carrying out a vacuum defoaming technology to prepare a catalyst slurry; 2, directly coating two sides of a proton exchange membrane with the catalyst slurry prepared in step 1, and drying the catalyst slurry to obtain a membrane electrode CCM; and 3, fixing gas diffusion layers to two sides of the membrane electrode produced in step 2, and carrying out edge sealing treatment to produce the fuel cell membrane electrode assembly. Compared with the prior art, the method disclosed in the invention has the advantages of simple process, high efficiency, no hot pressing treatment, no deformation shrinkage of the proton exchange membrane, suitableness for batch production, and good product consistence; and there is no interface effect between every catalyst layer and the proton exchange membrane, so the proton and electron transfer resistance is low, the production cost of a fell cell is effectively reduced, and the fuel cell membrane electrode assembly is suitable for heavy-current discharge vehicle piles.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a preparation method of a fuel cell membrane electrode assembly. Background technique [0002] Proton exchange membrane fuel cell (hereinafter referred to as fuel cell) is a power generation device that directly converts chemical energy into electrical energy by using the electrochemical reaction of fuel (hydrogen) and oxidant (generally air) without the Carnot cycle. The fuel cell membrane electrode assembly (MEA) composed of proton exchange membrane and noble metal catalyst is the core component of the fuel cell. During the operation of the fuel cell, the MEA needs to effectively separate the fuel from the oxidant to prevent the direct mixing of the fuel and the oxidant. Chemical reactions, in extreme cases, may even cause explosions, or the mutual leakage of fuel and oxidant may cause battery power generation efficiency to decrease and life attenuation. [0003] In proton ...

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Problems solved by technology

As described in the patent CN201180015920.5, a pair of substrates coated with an electrocatalytic layer is arranged in a way of supporting the electrolyte membrane, and a pair of lamination rollers are used to apply heat pressure from the outside of the substrate, thereby thermally transferring the electrocatalytic layer. Although the method controls the shrinkage and deformation of the proton exchange membrane, the operation is complicated through the transfer process, and there is an interface effect between the catalytic layer and the proton exchange membrane, which reduces the performance of the MEA.

As described in patent CN200810024885.3, the proton exchange membrane is treated in hydrogen peroxide, boiled in pure water, and finally washed in distilled water. After the slurry is prepared, the CCM is produced by spraying. Long cycle, not conducive to mass production

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