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Fuel cell membrane electrode, membrane electrode preparation method, fuel cell system and vehicle

A fuel cell membrane and electrode technology, which is applied in the fields of vehicles, fuel cell systems, and fuel cell membrane electrodes, and can solve problems such as detachment of gas diffusion layer plates or catalyst layers

Pending Publication Date: 2022-01-21
SANY AUTOMOBILE MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve or improve the technical problem that the gas diffusion layer is easily detached from the pole plate or catalyst layer, an object of the present invention is to provide a fuel cell membrane electrode

Method used

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  • Fuel cell membrane electrode, membrane electrode preparation method, fuel cell system and vehicle
  • Fuel cell membrane electrode, membrane electrode preparation method, fuel cell system and vehicle
  • Fuel cell membrane electrode, membrane electrode preparation method, fuel cell system and vehicle

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Embodiment 1

[0057] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy, also known as an electrochemical generator. Fuel cells are the fourth power generation technology after hydropower, thermal power and atomic power. Since the fuel cell converts the Gibbs free energy in the chemical energy of the fuel into electrical energy through an electrochemical reaction, it will not be limited by the Carnot cycle effect, so the efficiency is high, and the fuel cell uses fuel and oxygen as raw materials. There are no mechanical transmission parts, very little harmful gas is discharged, and the service life is long. The fuel cell membrane electrode 100 is a membrane electrode assembly, also known as a membrane electrode, which can be understood as an electrode equipped with a membrane combination in its structure, and is a key core component of fuel cell power generation.

[0058] like figure 2 and image 3 As shown, a fuel cell membrane el...

Embodiment 2

[0065] The fuel cell membrane electrode 100 also includes a proton exchange membrane 110 . Specifically, the proton exchange membrane 110 (PEM) provides channels for the migration and transport of protons, not only has the function of blocking, but also has the function of conducting protons. The protons pass through the proton exchange membrane 110 from the anode to the cathode, and form a loop with the electron transfer of the external circuit to provide current to the outside world. Therefore, the performance of the proton exchange membrane 110 plays a very important role in the performance of the fuel cell membrane electrode 100, directly affecting battery life. The material of the proton exchange membrane 110 meets the following conditions: good proton conductivity; the electroosmosis of water molecules in the membrane is small; the permeability of gas in the membrane is as small as possible; the electrochemical stability is good; the dry-wet conversion performance is goo...

Embodiment 3

[0067] The gas diffusion layer 130 is an elastic carbon nanotube porous membrane. By providing the gas diffusion layer 130 as an elastic carbon nanotube porous membrane, the gas diffusion layer 130 has a uniform porous thin layer structure and has excellent stretchability, electrical conductivity, chemical stability, and thermal stability. In addition, carbon nanotubes are nanomaterials, which also have advantages such as light weight.

[0068] In another embodiment, the gas diffusion layer 130 is an elastic graphene porous membrane. By providing the gas diffusion layer 130 as an elastic graphene porous membrane, the gas diffusion layer 130 has a uniform porous thin layer structure and has excellent stretchability, electrical conductivity, chemical stability, and thermal stability. In addition, graphene is a sp 2 A material in which hybridized carbon atoms are tightly packed into a single-layer two-dimensional honeycomb lattice structure has more excellent electrical and mec...

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Abstract

The invention relates to the technical field of fuel cells and provides a fuel cell membrane electrode, a membrane electrode preparation method, a fuel cell system and a vehicle. The fuel cell membrane electrode comprises a catalyst layer, a gas diffusion layer arranged on at least one side of the catalyst layer, and a polar plate arranged on the side, away from the catalyst layer, of the gas diffusion layer; the gas diffusion layer is made of an elastic material, and the polar plate, the gas diffusion layer and the catalyst layer are of an integrated structure. According to the technical scheme, the gas diffusion layer is made of the elastic material, so that the gas permeability and the flexibility are better, the possibility of separation is greatly reduced, the galvanic pile is kept stable in different operating environments and working conditions, and the stability and the durability of the fuel cell are favorably improved. Besides, the polar plate, the gas diffusion layer and the catalyst layer are of an integrated structure, so that gaps between the polar plate and the gas diffusion layer and between the gas diffusion layer and the catalyst layer can be reduced, and the stability and durability of the fuel cell can be further improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell membrane electrode, a method for preparing the membrane electrode, a fuel cell system and a vehicle. Background technique [0002] During the operation of the fuel cell membrane electrode, the proton exchange membrane will expand and contract with the change of humidity and temperature. Due to the expansion and contraction of the proton exchange membrane, and the different expansion coefficients, coupled with the limitation of the position of the two plates, it will cause the hot and humid in-plane compression and tension to generate pressure. like figure 1 As shown, the traditional gas diffusion layer 130' is highly brittle, and it is easy to detach from the electrode plate or catalyst layer under the action of internal stress such as compressive stress, freezing, melting or swelling, thereby causing mechanical attenuation, especially after several heat and humid...

Claims

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Application Information

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IPC IPC(8): H01M8/1004H01M4/86H01M4/88
CPCH01M8/1004H01M4/8605H01M4/88H01M2008/1095H01M2250/20Y02E60/50
Inventor 龙鹏李玉鹏王江林
Owner SANY AUTOMOBILE MFG CO LTD
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