Preparation method of membrane electrode comprising three-dimensional lyophobic negative electrode catalysis layer

Abstract

The invention discloses a preparation method of a membrane electrode comprising a three-dimensional lyophobic negative electrode catalysis layer. According to the method, a high-platinum-content catalyst and an ultra-thin proton exchange membrane are adopted; and the negative electrode catalysis layer is added with a three-dimensional structured auxiliary and a lyophobic material to prepare the high-performance and high-power-density membrane electrode comprising the three-dimensional lyophobic negative electrode catalysis layer. By adding carbon nanotubes and the like to the negative electrode catalysis layer disclosed in the invention to form the three-dimensional structure of the catalysis layer, the porosity of the catalysis layer and catalyst utilization rate are improved, and gas diffusion capability and electron transport capability are enhanced; by virtue of the added lyophobic material, water management of the negative electrode can be improved effectively, particularly, watergenerated in the negative electrode reaction can be discharged effectively at high current density, so that it is ensured that the negative electrode reaction gas can be smoothly diffused to the negative electrode catalysis layer to be reacted with the catalyst; the preparation method is simple in steps, high in feasibility, practical and easy to operate and low in cost; and the membrane electrode is small in size, light in weight, and easy to prepare, and large-scale production of the membrane electrode can be realized.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a method for preparing a membrane electrode containing a three-dimensional hydrophobic cathode catalyst layer. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a green energy that directly converts chemical energy into electrical energy. It has the advantages of high conversion efficiency, fast start-up at low temperature, and no pollution. It has a wide range of applications in portable electronic devices and power vehicles. prospect. Membrane electrode (MEA) is the core component of a proton exchange membrane fuel cell. It consists of an anode gas diffusion layer, an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer and a cathode gas diffusion layer. The performance of the membrane electrode directly determines the performance of the fuel cell. , the preparation of membrane electrodes with high performance...

AI Technical Summary

Problems solved by technology

However, the process of preparing a composite multilayer membrane electrode is a little complicated, which also increases the preparation cost of the membrane electrode.

[0011] Although the above reports have recognized the importance of constructing a cathode catalyst layer with good hydrophobicity and made some attempts, there are still many shortcomings in these methods, and the utilization rate of the catalyst in the membrane electrode catalyst layer still needs to be further improved. The conductivity of electrons in the catalytic layer needs to be continuously improved, and there are still some problems in the diffusion of reaction gases in the catalytic layer and the water management of the cathode, so that the membrane electrode of the proton exchange membrane fuel cell cannot achieve high performance under the condition of low platinum loading.

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