Membrane electrode of proton exchange membrane fuel cell and preparation method of membrane electrode

Abstract

The invention provides a membrane electrode of a proton exchange membrane fuel cell. A negative electrode catalytic layer is coated on a surface of a proton exchange member, a positive electrode innercatalytic layer and a positive electrode outer catalytic layer are sequentially coated on the other surface of the proton exchange membrane, gas diffusion layers are respectively arranged at outer sides of the negative electrode catalytic layer and the positive electrode outer catalytic layer by hot pressing, the positive electrode inner catalytic layer comprises a catalyst and proton exchange resin, the mass of the proton exchange resin accounts for 30-50% of the mass of the catalyst, the positive electrode outer catalyst comprises a catalyst, proton exchange resin and PTFE, the mass of theproton exchange resin accounts for 5-15% of the mass of the catalyst, and the mass of the PTFE accounts for 3-6% of the mass of the catalyst. The invention also provides a preparation method for the membrane electrode of the proton exchange fuel cell. The membrane electrode is favorable in stability, and the preparation method is simple.

Description

Technical field [0001] The invention relates to a membrane electrode of a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an efficient and environmentally friendly way of generating electricity. Its energy efficiency conversion rate exceeds 60%, which is much higher than the 30% to 35% energy conversion efficiency of internal combustion engines. In addition, the fuel cell uses hydrogen as fuel, and the fuel is renewable. And the source is wide, and the discharge is only water, which is of special significance to the national energy strategy and environmental protection. As the core component of the fuel cell, the membrane electrode (MEA) directly affects the output performance and service life of the fuel cell; moreover, the membrane electrode constitutes the main part of the fuel cell cost, which currently accounts for about 69%. Therefore, how to improve the performance of the memb...

AI Technical Summary

Problems solved by technology

However, judging from the current development situation, these measures have certain defects and cannot achieve the ideal self-humidification effect.

For example, the inorganic particles added in the MEA components are prone to agglomeration or loss after working for a long time, thereby reducing the performance stability and service life of the fuel cell; the polymer additives will increase the resistance of the membrane electrode, and the compatibility of the polymer Sexual problems will also increase the difficulty of the preparation process of membrane electrodes

As for the additional moisturizing layer, it will also fall off or be damaged after a long time of work

In addition, traditional MEA anode catalysts generally have a single-layer structure, and the amount of reaction water generated by the battery will increase sharply under high current density working conditions. If the anode catalyst layer does not have good water management measures, it is also prone to water flooding, especially After the humidification modification