Fuel cell membrane electrode CCM with high-temperature-resistant and self-humidifying characteristics

Abstract

The invention discloses a preparation method of a fuel cell membrane electrode CCM. The method comprises the following steps: preparing a hydrophilic catalyst, a perfluorosulfonic acid resin solution and a dispersing agent into a slurry with uniform components in a dispersing manner, and transferring the slurry to two sides of a proton exchange membrane to obtain the fuel cell membrane electrode CCM, wherein the EW value of the proton exchange membrane is 700 to 900; and the EW value of the perfluorinated sulfonic acid resin is 700 to 800; The hydrophilic catalyst and a short-side-chain low-EW-value resin are adopted, binding sites of water are increased so that the affinity of the catalyst layer to water is improved, a rich proton transmission network structure is constructed, the proton conduction rate of the catalyst layer is increased, the proton exchange membrane with a high water conduction capacity is adopted, the diffusion capacity of water generated by a cathode to an anode is enhanced, and a self water balance capability of the MEA under the condition that external humidification is not performed is realized. The whole preparation process does not introduce additional substances, does not need to change a membrane electrode preparation process flow, and is easy to popularize and apply.

Description

technical field

[0001] The invention belongs to the field of fuel cells, and mainly relates to the development of fuel cell catalyst layers. Background technique

[0002] Both the perfluorosulfonic acid resin in the proton exchange membrane and the catalytic layer need sufficient moisture to maintain their high electrical conductivity, and the decrease in humidity will lead to a decrease in the proton conductivity of the proton exchange membrane and an increase in the internal resistance of the battery, which in turn will cause Battery performance is degraded. In actual operation, it is often necessary to use external humidification equipment to bring hydrogen and oxygen into the water vapor before entering the battery to humidify the membrane electrode. However, these additional devices will lead to the complexity and cost of the fuel cell system. Self-humidifying membrane electrodes are an important development direction in the field of proton exchange membrane fuel cell...

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