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Proton exchange membrane fuel cell multi-layer membrane electrode structure and its preparing method

A proton exchange membrane, electrode structure technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of high contact resistance, unfavorable proton conduction, etc., to improve battery performance, improve catalyst utilization, and improve utilization. Effect

Inactive Publication Date: 2006-03-08
中科军联(张家港)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the latter, the membrane electrode (MEA) prepared by the trans-pressure method has a large contact resistance between the membrane and the electrode, which is not conducive to proton conduction.

Method used

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  • Proton exchange membrane fuel cell multi-layer membrane electrode structure and its preparing method
  • Proton exchange membrane fuel cell multi-layer membrane electrode structure and its preparing method
  • Proton exchange membrane fuel cell multi-layer membrane electrode structure and its preparing method

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preparation example Construction

[0045] 1. Preparation of proton exchange membrane multilayer structure: under 0.02-0.10MPa negative pressure, press 0.1-5.0mg / cm on the surface of H-type or Na-type Nafion membrane 2 The amount of spray polymer electrolyte 2, such as Nafion (5%) solution or Na-type Nafion solution.

[0046] 2. Preparation of catalyst slurry: use a primary balance to weigh a certain amount of Nafion solution, then add a certain amount of mixed solvent of alcohols and water, the mass ratio of alcohols to water is 100:1-1:100. Then add an appropriate amount of catalyst, the content of Nafion is: 5-50%. The ratio of solvent to catalyst is 50:1-5:1. Mix and sonicate evenly.

[0047] 3. Catalyst layer preparation: spray the catalyst slurry on both sides of the proton exchange membrane with a multilayer structure under a negative pressure of 0.02-0.10 MPa to obtain a membrane electrode (MEA). Alternatively, the catalyst slurry is sprayed or brushed onto the PTFE membrane, and then pressed onto the...

Embodiment 1

[0052] a. Take a piece of Nafion  115 film (Dupont) was treated at a certain temperature (60°C) and negative pressure (0.06MPa) for 30 minutes. Take by weighing 320mg Nafion (5% aqueous solution, EW value is 1100), dilute with 1600mg isopropanol (chemically pure, Shenyang Reagent No. cm 2 . Accurately weigh 96mg of PtRu black (Johnson Matthey), add a mixed solution of absolute ethanol and water (water: absolute ethanol=1:20, mass ratio) and mix evenly, then add 400mg 5% Nafion, continue to stir and mix evenly to obtain a catalyst Slurry, sprayed on the membrane, the final catalyst loading is 3.2mg / cm 2 .

[0053] Spray 1mg / cm on the other side of Nafion 115 2 Nafion solution (Nafion dry weight). Accurately weigh 50mg of Pt black (Johnson Matthey), add a mixed solvent of absolute ethanol and water (water: absolute ethanol = 1: 20 mass ratio) and mix uniformly, then add 160mg 5% Nafion, mix uniformly to obtain catalyst slurry, spray on film. The loading amount of the ca...

Embodiment 2

[0066] Prepare the slurry according to the steps in Example 1, then spray the catalyst slurry on the PTFE membrane, and the electrode loadings are respectively: anode: PtRu black (Johnson Matthey), 3.0 mg / cm 2 , Nafion content 20wt.%. Cathode: Pt / C (60wt%) (Johnson Matthey) 2.1mg / cm 2 , Nafion content is 15wt.%. Spray 0.5mg / cm on both sides of the Na-type Flemion membrane according to the steps of Example 1 2 Nafion (Na form, dry weight) solution. Then at 230°C, nitrogen N 2 Treated under protected conditions for 2 hours. Cut out the PTFE membrane prepared above, the size is 2×2cm 2 , placed on both sides of the sodium Nafion 115 membrane treated as above, preheated at 170°C for 1 minute, kept at 43MPa for 1.5 minutes, took it out to cool, removed the PTFE membrane, and then hydrogenated the Flemion membrane with the catalytic layer After that, the cathode and anode diffusion layers are placed on both sides to assemble the battery.

[0067] The performance of the membra...

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Abstract

The membrane electrode in multiple layers is composed of anodic catalysis layer, membrane of electrolyte and cathodal catalysis layer. There is a layer of polymer dielectric between the membrane of electrolyte and the anodic catalysis layer, the cathodal catalysis layer. The layer of polymer dielectric can change microstructure of interface between the membrane of electrolyte and the anodic catalysis layer, the cathodal catalysis layer. The method includes steps: (1) preparing the layer of polymer dielectric; (2) preparing catalyst slurry; (3) preparing the anodic catalysis layer, the cathodal catalysis layer so as to obtain membrane electrode; (4) heat treating the membrane electrode obtained from step (3) so as to produce finished product. The invention improves binding force between catalysis layer and membrane of electrolyte, lowers contact resistance between membrane and electrode as well as enhances conduction of protons and electrons.

Description

technical field [0001] The invention relates to the technical field of fuel cells, and relates to a membrane electrode (MEA) structure of a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] In recent years, multi-functional portable electronic products have developed rapidly. The specific energy density of various primary or secondary batteries currently commercialized is low, and it is necessary to increase the volume and weight of batteries to meet the electricity demand of electronic products. Moreover, the primary or secondary battery has the problem of environmental pollution. A fuel cell is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy. The fuel can be hydrogen, organic compounds such as petroleum, reformed gas of methanol, and organic alcohols such as liquid methanol and ethanol. Fuel cells have the advantages of simple structure, high theoretical specif...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 孙公权王素力汪国雄孙海赵新生樊小颖辛勤
Owner 中科军联(张家港)新能源科技有限公司
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