Method for preparing membrane electrode of direct methanol fuel cell

A methanol fuel cell, membrane electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as the decrease in catalyst utilization rate

Inactive Publication Date: 2006-02-08
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
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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 ca

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

Examples

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Example Embodiment

[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 needs to be below 5 wt%. Weigh 5-20 parts of alcohol, add 1 part of carbon material, stir and ultrasonically disperse for a few minutes, add the corresponding amount of PTFE emulsion or powder weighed in step a to the ultrasonically dispersed suspension In the liquid. Then the suspension is ground into a bright and thick liquid by colloid milling, and then 20-200 parts 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 head dropper to drop a few drops of the ink-like liquid obtained in step b on the diffusion layer, gently bru...

Example Embodiment

[0034] Example 1: Hydrophobic treatment of carbon paper with 3wt% PTFE emulsion so that the mass of PTFE is 10% and 30% respectively and sintered; carbon paper containing 10% by mass of PTFE is the anode diffusion layer, containing 30% by mass of PTFE Is the cathode diffusion layer. Take acetylene carbon black and 60% PTFE emulsion at a solid mass ratio of 80:20, add 1 part of acetylene carbon black to 10 parts of ethanol, stir and ultrasonically disperse for 3 minutes; add the weighed PTFE emulsion Then use a colloid mill to grind it into a shiny liquid; add 100 parts by mass of ethanol, and ultrasonically disperse for half an hour. The obtained ink-like liquid is repeatedly scraped on the diffusion layer with a thin PVC (polyvinyl chloride) sheet, and dried with a hair dryer until the leveling layer load is 1.5mg / cm 2 . The diffusion layer was baked at 240°C for 1 hour and then at 350°C for 2 hours. After cooling, spray the solid load on the leveling layer to be 0.1mg / cm 2 Nafio...

Example Embodiment

[0035] Example 2: It is roughly the same as Example 1, except that PTFE powder is used instead of PTFE emulsion when making the leveling layer. Leveling layer load 1.2mg / cm 2 , Anode PtRu / C catalyst layer metal loading 3mg / cm 2 , The metal loading of the cathode Pt / C catalyst layer is 1mg / cm 2 . Its performance in passive direct methanol fuel cells is as follows 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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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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