Catalyst coated membrane electrode of fuel cell with self-moistening function and preparation method thereof

Abstract

The invention provides a catalyst coated membrane electrode of a proton exchange membrane fuel cell with self-moistening function, which is characterized in that catalyst coatings on two side surfaces of a proton exchange membrane are provided with an inner catalyst layer and an outer catalyst layer, the catalyst coating close to the proton exchange membrane is the inner catalyst layer, the content of a self-moistening agent and proton exchange membrane resin in the inner catalyst layer is high, and the catalyst coating close to a gas dispersion layer is the outer catalyst layer, the content of the self-moistening agent and the proton exchange resin in the outer catalyst layer is low, and Pt loadings of the inner catalyst layer and the outer catalyst layer are same. The invention strengthens the moisture holding capacity of the electrode by adding the self-moistening agent in electrode slurry, enables a membrane electrode assembly to have stable electric output in a low-moistening or no-moistening fuel or oxidant environment, and has simple structure as the catalyst coated membrane electrode with self-moistening function is prepared by adopting a machine spraying technology, uniform thickness of the catalyst coating, good repeatability and easy batch production.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a catalyst-coated membrane-electrode assembly for a proton-exchange membrane fuel cell, in particular to a catalyst-coated membrane-electrode assembly with a self-humidification function. Background technique [0002] Catalyst-coated membrane electrode (CCM), because the catalyst layer can be developed to be ultra-thin (thickness <5 μm), the utilization rate of the catalyst is improved, and the interfacial mass transfer resistance between the catalyst layer and the proton exchange membrane is reduced, which is conducive to improving battery efficiency. . At the same time, the catalyst-coated membrane electrode is conducive to the functional differentiation of fuel cell components, which facilitates the post-treatment of the electrode catalyst layer and endows it with more functions. Therefore, the application of catalyst-coated membrane electrodes has become...

AI Technical Summary

Problems solved by technology

In the measures of the prior art, a waterproof layer or a water-retaining layer is added between the catalyst layer and the gas diffusion layer of the membrane electrode assembly, which increases the manufacturing process of the membrane electrode assembly and increases the cost.

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