Method for preparing membrane electrode of direct methanol fuel cell

A methanol fuel cell and membrane electrode technology, which is applied to battery electrodes, circuits, electrical components, etc., and can solve problems such as the decline in catalyst utilization

Inactive Publication Date: 2009-08-05
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Although the electrode has a relatively large range of stereochemical reactivity and relatively good material conductivity as mentioned above, the porous surface of its diffusion layer still causes a large amount of catalyst to penetrate into the diffusion layer, leaving the exchange membrane surface with more reactivity. A large area, resulting in a certain decline in catalyst utilization

Method used

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  • Method for preparing membrane electrode of direct methanol fuel cell
  • Method for preparing membrane electrode of direct methanol fuel cell
  • Method for preparing membrane electrode of direct methanol fuel cell

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preparation example Construction

[0026] c. Preparation of leveling layer slurry. The leveling layer slurry used in the present invention uses low-carbon alcohol as the basic solvent, and the water content of the alcohol must be below 5 wt%. Weigh 5-20 parts of alcohol, add 1 part of carbon material, stir and ultrasonically disperse for several minutes, add the corresponding amount of PTFE emulsion or powder weighed in step a into the ultrasonically dispersed suspension in the liquid. Then the suspension is ground into a bright thick liquid with a colloid mill, and then 20-200 parts by weight of alcohol is added, and ultrasonically dispersed at a frequency of 40-59 kHz for 0.5-1 hour to obtain the desired ink-like liquid.

[0027] d. Coating of leveling layer. The leveling layer can be applied on the diffusion layer by brushing, scraping or spraying. The method of brushing and scraping is as follows: Use a rubber dropper to drop a few drops of the ink-like liquid obtained in step b on the diffusion layer, u...

Embodiment 1

[0034] Embodiment 1: use 3wt% PTFE emulsion hydrophobization treatment carbon paper, make the mass of PTFE therein account for 10% and 30% respectively and sinter; Contain PTFE mass 10% carbon paper is anode diffusion layer, contain PTFE mass 30% is the cathode diffusion layer. Take acetylene type carbon black and 60% PTFE emulsion according to the solid mass ratio of 80:20, add 1 part of quality acetylene type carbon black in 10 parts of quality ethanol, stir and ultrasonically disperse for 3 minutes; add the weighed PTFE emulsion Then use a colloid mill to grind it into a bright liquid; add 100 parts by mass of ethanol, and ultrasonically disperse for half an hour. Use a thin PVC (polyvinyl chloride) sheet to scrape and coat the obtained ink-like liquid on the diffusion layer repeatedly, and blow it dry with a hair dryer until the load of the leveling layer is 1.5mg / cm 2 . The diffusion layer was baked at 240°C for 1 hour and then at 350°C for 2 hours. Spray the solid loa...

Embodiment 2

[0035] Embodiment 2: roughly as embodiment 1, just replace PTFE emulsion with PTFE powder when making leveling layer. Leveling layer load 1.2mg / cm 2 , anode PtRu / C catalyst layer metal loading 3mg / cm 2 , the cathode Pt / C catalyst layer metal loading 1mg / cm 2 . Its performance in passive direct methanol fuel cells such as Figure 4 shown.

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Abstract

The invention discloses a method for making a membrane electrode of direct methanol fuel battery. The membrane electrode comprises proton exchange membrane, positive electrode of carbon carried platinum-ruthenium catalyst and negative electrode of carbon carried platinum catalyst. The invention is characterized in that it reduces the usage of direct methanol fuel battery catalytic agent noble metal and lowers costs of fuel battery. The direct methanol fuel batteries assembled with the membrane electrode components has the advantages of high output power density, great performance test reproducibility.

Description

Technical field: [0001] The invention relates to the technical field of fuel cells, in particular to a method for preparing a membrane electrode of a direct methanol solution fuel cell with higher power density and lower consumption of precious metals. Background technique: [0002] Batteries are usually used as a relatively independent, mobile power supply. However, the existing secondary power sources all have the problem of low energy density. Among them, the lithium-ion battery with the highest energy density does not exceed 300Wh / kg, while others such as nickel-metal hydride, chromium-nickel, and lead-acid batteries are as low as 100Wh / kg. On the one hand, this has caused the disadvantages of excessive battery volume or weight; on the other hand, the energy stored in the battery is too small and the service cycle is too short, requiring frequent long-term charging, which affects the use of the battery. A fuel cell is an energy conversion device that isothermally conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 邱祎翎李宝华杜鸿达康飞宇许瑞赵丰刚曾毓群
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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