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Electrode and membrane electrode of proton exchange membrane fuel cell, and making method and application

A proton exchange membrane and fuel cell technology, which is applied in fuel cell parts, fuel cells, battery electrodes, etc., can solve problems that have not yet been reported, and achieve the effect of reducing gas mass transfer resistance and increasing porosity.

Inactive Publication Date: 2007-05-16
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

However, how to more effectively adjust the pore structure and porosity in the cathode catalytic layer has not been reported in the current open literature.

Method used

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  • Electrode and membrane electrode of proton exchange membrane fuel cell, and making method and application
  • Electrode and membrane electrode of proton exchange membrane fuel cell, and making method and application
  • Electrode and membrane electrode of proton exchange membrane fuel cell, and making method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] a. Preparation of membrane covered with catalyst layer

[0042] 1) Prepare the anode catalyst slurry, weigh 96mg of PtRu black (Johnson Matthey), then add 1920mg of a mixed solvent of absolute ethanol and water (water: absolute ethanol = 1:20 mass ratio), mix well and then add 338mg of 5% Nafion ( Dupont, EW value is 1100) solution, use spray gun to spray this slurry on one side of the Nafion 115 film of Na type evenly, the loading capacity of catalyst is 3.2mg / cm 2 .

[0043] 2) Configure the cathode catalyst slurry in the same way, add 1500mg of absolute ethanol and water mixed solvent (water: absolute ethanol = 1:20 mass ratio) to 50mg Pt black (Johnson Matthey), then add 112mg of 5% Nafion solution, 100mg of ammonium carbonate (5% aqueous solution), stir and mix uniformly to obtain catalyst slurry, and use a spray gun to spray this slurry evenly on the other side of the Nafion 115 film of Na type. The loading amount of the catalyst is 2.3mg / cm 2 .

[0044] 3) Trea...

Embodiment 2

[0049] Prepare slurry according to embodiment 1 step, then catalyst slurry is sprayed on PTFE film, and catalyst slurry composition is respectively: anode: adopt PtRu black (Johnson Matthey) catalyst, 3.2mg / cm 2 , a mixed solvent of isopropanol and water (water: isopropanol=1:5) is used as a dispersant, the mass ratio of the dispersant to the catalyst is 30:1, and the mass ratio of Nafion to the catalyst is 3:17. Cathode: using carbon-supported catalyst, the carbon support is BP-2000, the loading of Pt is 40wt%, 3.0mg / cm 2 , the mixed solvent of Virahol and water (water: Virahol=1: 2) as dispersant, the mass ratio of dispersant and catalyst is 30: 1, Nafion and catalyst mass ratio 3: 17, ammonium oxalate (with Nafion mass ratio The ratio is 1:1), NaOH (the mass ratio to Nafion is 1:1). Put the cathode catalytic layer at 180°C N 2 Treated under gas protection conditions for 3 hours. Cut out the PTFE membrane prepared above, the size is 2×2cm 2 , placed on both sides of the ...

Embodiment 3

[0054] CCM was prepared according to the steps in Example 1, and the proton exchange membrane was H-type Nafion115. Electrode loads are: anode, PtRu black (Johnson Matthey), 3.6mg / cm 2 , the mass ratio of Nafion to catalyst is 3:17. Cathode: Pd 3 Pt 1 / C (the atomic ratio of Pd to Pt is 3:1), 2.5mg / cm 2 , Nafion and catalyst mass ratio 1: 9, lithium carbonate (1: 1 with Nafion mass ratio). The thickness of the cathode prepared by this method is about 20 μm, and the porosity can reach 50%.

[0055] For the convenience of comparison, the preparation of CCM is as follows: the other conditions of the anode and cathode are the same as above, except that no pore-forming agent is added to the cathode catalyst.

[0056] The performance of the membrane electrode under air self-breathing conditions at 60°C is shown in Figure 3. Operating conditions: 1M methanol aqueous solution 0.25ml / min sample injection; the cathode is air self-breathing.

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Abstract

The preparation method for electrode and membrane electrode of proton exchange membrane fuel cell comprises: when preparing the catalysis layer with thickness in 3-100 mum, adding pore-forming agent, and adjusting the rate between alcohol and water in dispersing agent to change the recrystallized pore-forming agent size for adjusting electrode hole size and porosity in 30-75%. This invention can improve gas mass transfer and cell performance, and has wide application.

Description

technical field [0001] The invention relates to an electrode and a membrane electrode structure of a proton exchange membrane fuel cell. [0002] The present invention also relates to the preparation method of the above electrode and membrane electrode. [0003] The present invention also relates to the application of the above electrodes and membrane electrodes Background technique [0004] A fuel cell is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy. Its fuel can be hydrogen, reformed gas of organic compounds such as petroleum and methanol, and organic alcohols such as liquid methanol and ethanol. Fuel cells have the advantages of simple structure, high theoretical specific energy density, and environmental friendliness. They are especially suitable for portable power sources, electric locomotive power sources and distributed power stations, etc., and have broad application prospects. [0005] Membrane ele...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/90H01M4/92B01J32/00H01M4/88H01M8/02H01M2/14H01M8/1004
CPCY02E60/12Y02E60/50Y02P70/50
Inventor 孙公权王素力孙海汪国雄毛庆王琪辛勤
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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