Proton exchange membrane fuel cell and preparation method thereof

Abstract

The invention provides a proton exchange membrane fuel cell. The cell comprises an anode gas diffusion electrode, a cathode membrane electrode and a cathode gas diffusion layer; the cathode membrane electrode is prepared by coating one surface of a proton exchange membrane with a cathode catalyst layer; the anode gas diffusion electrode is prepared by sequentially coating one surface of an anode gas diffusion layer with a first anode catalyst layer and a second anode catalyst layer; the anode gas diffusion electrode, the cathode membrane electrode and the cathode gas diffusion layer are sequentially stacked in a manner that the second anode catalyst layer is in contact with the proton exchange membrane, and are packaged together by adopting a special fixture for the fuel cell; the mass ratio of a catalyst to the ionomer in the first anode catalyst layer is 3: 1-4: 1, and the mass ratio of the catalyst to the ionomer in the second anode catalyst layer is 1: 1-1: 2. The invention also provides a preparation method of the proton exchange membrane fuel cell. The proton exchange membrane fuel cell is firm in structure, and the preparation method of the proton exchange membrane fuel cellis simple and feasible.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] Fuel cell is an efficient and clean new energy utilization technology. At present, there are two typical methods for the production of fuel cell membrane electrodes. One is the CCM-GDL structure, that is, the catalyst is directly prepared on the proton exchange membrane. On one side, tear off the substrate and then coat the other side. The advantages are high catalyst utilization, low mass transfer resistance, and high battery performance. The film is difficult to spread, and is prone to a series of problems such as deformation, wrinkles, and air bubbles. Therefore, it is difficult to coat the back side, which takes a long time and it is difficult to obtain a uniform and flat CCM product. The other is the GDE-membrane structure, that is, the cathode and anode catalysts are respectively coated on the upper layer of the microporo...

AI Technical Summary

Problems solved by technology

[0002] Fuel cell is an efficient and clean new energy utilization technology. At present, there are two typical methods for the production of fuel cell membrane electrodes. One is the CCM-GDL structure, that is, the catalyst is directly prepared on the proton exchange membrane. On one side, tear off the substrate and then coat the other side. The advantages are high catalyst utilization, low mass transfer resistance, and high battery performance. The film is difficult to spread, and it is prone to a series of problems such as deformation, wrinkles, and air bubbles, so the back coating is difficult, time-consuming, and it is difficult to obtain a uniform and flat CCM product

The other is the GDE-membrane structure, that is, the cathode and anode catalysts are respectively coated on the upper layer of the microporous layer of the gas diffusion layer, and then hot-pressed with the proton exchange membrane to form a membrane electrode. The advantage of this method is that it avoids the easy deformation and wrinkles of the proton membrane The problem is that the operation is simple and convenient. The disadvantage is that hot pressing can easily cause the catalyst to be embedded in the gas diffusion layer, and the mass transfer resistance is relatively large, which has a great impact on the performance of the membrane electrode, especially the cathode surface.