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Fuel cell membrane electrode assembly and preparation method thereof, and fuel cell

A fuel cell membrane and electrode assembly technology, which is applied to fuel cells, battery electrodes, electrical components, etc., can solve the problems of reducing fuel cell performance, affecting the transport capacity of the diffusion layer, reducing the porosity of the diffusion layer, etc., to improve the gas transport capacity , prevent flooding and improve drainage capacity

Active Publication Date: 2020-08-21
TIANNENG BATTERY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diffusion layer needs to undertake the function of transporting gas reactants and transporting reaction product water. Due to the pressing effect of the protrusions on the cathode and anode plates on the diffusion layer during assembly, the porosity of the diffusion layer is reduced, which affects the transport capacity of the diffusion layer. , thereby reducing fuel cell performance

Method used

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  • Fuel cell membrane electrode assembly and preparation method thereof, and fuel cell
  • Fuel cell membrane electrode assembly and preparation method thereof, and fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 and 2 As shown, a fuel cell membrane electrode assembly 50 includes a membrane electrode assembly 30 and a pole plate 05 arranged on both sides of the membrane electrode assembly 30, and a gas flow channel 04 is provided at the interface between the pole plate 05 and the membrane electrode assembly 30 , the two sides of the MEA 30 are the anode and the cathode respectively.

[0028] Membrane electrode assembly 30 comprises proton exchange membrane 06, and the two sides of proton exchange membrane 06 are respectively provided with a layer of moisture retention layer 01, and moisture retention layer 01 has avoidance area corresponding to the position that forms gas channel 04 when being assembled into fuel cell, proton exchange membrane On both sides of 06, a layer of catalytic layer 02 and a diffusion layer 03 arranged outside the catalytic layer 02 are respectively provided in the avoidance area filled in the moisturizing layer 01. The hydrophilicity o...

Embodiment 2

[0032] (1) Make spraying baffles according to the flow channel pattern on the bipolar plate drawing, and cut layer holes at the positions corresponding to the baffle plate and the flow channel of the bipolar plate. Prepare a piece of Japanese Toray carbon paper with a thickness of 0.1 mm (as a moisture-retaining layer, with a contact angle of 75-80°) according to the requirements of the drawing, and lay it flat on a negative pressure platform, and place a spray baffle on it. The polytetrafluoroethylene resin is sprayed on the carbon paper by spraying, and then through the baking-sintering process, the hydrophobic agent is attached to the carbon paper to make a diffusion layer with hydrophobicity in the designated area. The hydrophobic contact of the diffusion layer The angle is 115-120°.

[0033] (2) Take 1 g of platinum-carbon catalyst, 30 g of n-propanol, 20 g of water, and 3 g of 50% PTFE resin emulsion, and prepare catalyst slurry by means of ultrasonic vibration and stirr...

Embodiment 3

[0036](1) Make spraying baffles according to the flow channel pattern on the bipolar plate drawing, and cut layer holes at the positions corresponding to the baffle plate and the flow channel of the bipolar plate. Prepare a piece of Japanese Toray carbon paper with a thickness of 0.1mm (as a moisture-retaining layer, with a contact angle of 75-80°) according to the requirements of the drawing, and lay it flat on a negative pressure platform, and then place a spray baffle on it. The polytetrafluoroethylene resin is sprayed on the carbon paper by spraying, and then through the baking-sintering process, the hydrophobic agent is attached to the carbon paper to make a diffusion layer with hydrophobicity in the designated area. The hydrophobic contact of the diffusion layer The angle is 115-120°.

[0037] (2) Take 1 g of platinum-carbon catalyst, 30 g of n-propanol, 20 g of water, and 3 g of 50% PTFE resin emulsion, and prepare catalyst slurry by means of ultrasonic vibration and st...

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Abstract

The invention discloses a fuel cell membrane electrode assembly, which comprises a proton exchange membrane, wherein a moisture retention layer is arranged on each of two sides of the proton exchangemembrane, the moisture retention layer is provided with an avoidance area corresponding to a position where a gas flow channel is formed when a fuel cell is assembled, the two sides of the proton exchange membrane and the avoidance area filled in the moisture retention layer are respectively provided with a catalytic layer and a diffusion layer arranged on the outer side of the catalytic layer, and hydrophilicity of the moisture retention layer, hydrophilicity of the catalytic layer and hydrophilicity of the diffusion layer are sequentially reduced. According to the fuel cell membrane electrode assembly, the diffusion layer and the catalytic layer are adjacently stacked, and the hydrophilicity of the moisture retention layer, the catalytic layer and the diffusion layer is sequentially reduced, so that the drainage capacity and the gas transportation capacity of the fuel cell are improved while the catalyst loading capacity is not reduced; and the diffusion layer is thin and has low hydrophilicity, so that the drainage process of the fuel cell is facilitated, and the flooding phenomenon is effectively prevented.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell membrane electrode assembly, a preparation method and a fuel cell. Background technique [0002] Due to its low operating temperature, high efficiency, high specific energy, and no pollution, proton exchange membrane fuel cells have attracted widespread attention from all walks of life, and have been widely studied in the field of passenger vehicles. With the continuous deepening of research, the power requirements for the stack continue to increase, and the membrane electrode assembly is one of the keys to determine the performance. Especially in the case of high current density, the speed of reactant diffusion from the flow channel to the catalytic layer is limited by the mass transfer rate, which affects the performance of the fuel cell. [0003] Traditional proton exchange membrane fuel cells are composed of cathode and anode plates, diffusion layers, catalyti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1004H01M4/88
CPCH01M4/8807H01M4/8825H01M8/1004Y02E60/50Y02P70/50
Inventor 俞海蛟曹寅亮徐乃涛李文范冬琪孙健徐淳川徐鹏杰林滨赵海敏
Owner TIANNENG BATTERY GROUP