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Integrated regenerative fuel cell membrane electrode assembly and preparation method thereof

A fuel cell membrane and assembly technology, which is applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of poor reliability and stability of membrane electrodes, unsuitability for URFC fuel cells, and difficulty in ensuring the quality of MEA, etc., to achieve repeatability Strong, easy to assemble and easy to operate

Active Publication Date: 2013-06-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these membrane electrode preparation methods have the advantages of low equipment cost and simple process, there are still some problems: 1) the junction of the proton exchange membrane and the diffusion layer-protective frame is prone to deformation during the hot pressing process, and the reliability of the membrane electrode and relatively poor stability
2) The deformation of the proton exchange membrane will affect the sealing effect, and the boundary of the diffusion layer and the protective frame will cause shear damage to the proton exchange membrane during hot pressing, the membrane electrode will easily leak, and the quality of the MEA is difficult to guarantee
3) When the battery is assembled, the junction of the proton exchange membrane and the diffusion layer-polyester protective frame is damaged by stress, which leads to the rupture of the proton exchange membrane, reduces the service life of the MEA, and affects the stability of the battery operation
In short, the traditional membrane electrode preparation method is not suitable for the preparation of membrane electrodes for URFC fuel cells

Method used

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  • Integrated regenerative fuel cell membrane electrode assembly and preparation method thereof
  • Integrated regenerative fuel cell membrane electrode assembly and preparation method thereof
  • Integrated regenerative fuel cell membrane electrode assembly and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Electrode preparation

[0036] 1) 200 milligrams of titanium powder with a particle size of 30-50 nanometers, 2 mL of PTFE emulsion with a solid content of 5% and 50 mL of ethanol are evenly vibrated with ultrasonic waves, and then the above slurry is scraped on the titanium fiber net to prepare a microporous layer with a scraper method. The knife-coated gas diffusion layer was dried at 120 and 250°C for 30 minutes, respectively, and finally fired at 340°C for 60 minutes.

[0037] 2) Stir 20 mg of platinum black catalyst, 20 mg of iridium black, 2 mL of PTFE emulsion with a solid content of 5% and 50 mL of isopropanol with ultrasonic waves, and then apply the slurry evenly on the prepared On the gas diffusion layer, it was dried at 120°C and 250°C for 30 minutes under nitrogen protection, and finally fired at 340°C for 60 minutes.

[0038] 3) Carry out three-dimensionalization of the electrode, according to the electrode area, weigh 6mL of Nafion resin (trade name Nafi...

Embodiment 2

[0040] MEA preparation

[0041] see attached Figure 1-Figure 3 The assembly position of the middle electrode, the proton exchange membrane, the protective frame and the protective gasket in the transition zone is used to prepare the membrane-electrode assembly.

[0042] Concrete preparation method comprises the following steps:

[0043] 1) Treat the membrane electrode assembly composed of the proton exchange membrane and the anode and cathode on both sides of the proton exchange membrane, and use a cutting knife or mold to cut the periphery of the anode and cathode, so that the proton exchange membrane in the middle The perimeter is protruding, and the width of the protruding is 0.5mm-100mm;

[0044] 2), make protective frame, the inside hole shape of protective frame is identical with the profile of described anode, negative electrode, the peripheral width of protective frame is consistent with the width protruding from proton exchange membrane periphery used, one side of ...

Embodiment 3

[0049] battery pack assembly

[0050] The specific method is as follows: First, put the sealing ring on the proton exchange membrane on both sides of the membrane electrode (MEA), and then place the cathode flow field plate and the anode flow field plate on both sides of the membrane electrode respectively, and press the three parts together to form a single battery. Multiple identical single cells are connected in series, that is, assembled into a battery stack. Put two pieces of copper (for current collection) on both sides of the first and last batteries respectively, and finally fix the battery stack with fixing plates and screws, thus assembling a battery stack. After checking that the airtightness of the battery stack is qualified, the performance test of the battery pack can be carried out.

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Abstract

The invention relates to an integrated regenerative fuel cell membrane electrode assembly and a preparation method of the integrated regenerative fuel cell membrane electrode assembly. The integrated regenerative fuel cell membrane electrode assembly comprises a specific combination of fuel cell oxygen reduction and water electrolysis double-effect catalytic agent. The integrated regenerative fuel cell membrane electrode assembly further comprises a special protection gasket, the special protection gasket is added in connection surfaces among a polyester frame, a gas diffusion layer and a proton exchange membrane in the process of hot pressing to protect the proton exchange membrane, so that the proton exchange membrane is prevented from being cut and damaged by the polyester frame and the gas diffusion layer in the process of ethylene-methyl acrylate (EMA) hot pressing, and therefore the reliability and durability of an integrated regenerative fuel cell membrane electrode are improved, and the performance of a uniform regeneration fuel cell (URFC) is improved.

Description

Field of invention [0001] The invention relates to key materials for fuel cells and their preparation methods, and in particular to an integrated renewable fuel cell membrane electrode assembly and its preparation method. Background technique [0002] A fuel cell is an electrochemical device that converts the chemical energy of fuel directly into electrical energy. It is not limited by the Carnot heat engine cycle, has high energy conversion efficiency, no pollution, high specific power and long service life, so it has broad application prospects in aerospace, transportation, mobile power and other fields. The integrated renewable fuel cell (URFC) integrates the functions of fuel cell and water electrolysis into one. It can realize the two processes of fuel cell power generation and water electrolysis respectively in one battery, and has the dual functions of power generation and energy storage. This battery system is highly integrated, has large battery specific power and ...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 张华民董明全邱艳玲张益宁
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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