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Membrane electrode assembly, manufacturing process therefor and direct type fuel cell therewith

A membrane electrode assembly, fuel electrode technology, applied in solid electrolyte fuel cells, fuel cells, fuel cell parts and other directions, can solve the problems of unsatisfactory effects, reduced proton activity, and unsustainable electrolyte membranes. Satisfactory proton conductivity, improved proton conductivity, and the effect of preventing overflow

Inactive Publication Date: 2005-05-18
TOKIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, polymer electrolyte membranes with ionic groups in the polymer side chains have a disadvantage: since the ionic groups are also hydrophilic, increasing the number of such ionic groups can lead to a more hydrated polymer electrolyte membrane, with a larger volume of the membrane. Tends to change due to swelling, resulting in a less durable electrolyte membrane
[0005] There is another problem: swelling the polymer electrolyte membrane with water can increase the proton transfer channel and improve the proton conductivity, making it easier for ethanol as a fuel to permeate the electrolyte membrane
[0008] However, these methods also have the problem that the mobility of protons decreases, resulting in an increase in the specific resistance per unit thickness of the electrolyte membrane even when the thickness of the electrolyte membrane is reduced.
[0016] In the prior art, the above problems are solved by adding hydrophilic or hydrophobic materials to the catalyst electrode side, but this has no satisfactory effect

Method used

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  • Membrane electrode assembly, manufacturing process therefor and direct type fuel cell therewith
  • Membrane electrode assembly, manufacturing process therefor and direct type fuel cell therewith

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The porous membrane used is a hydrophilic PTFE porous membrane with a membrane thickness of 25 μm.

[0052] The aqueous monomer solution used as the raw material solution for the proton conductive polymer was passed through 6 g of acrylamide-tert-butylsulfonic acid as the monomer, 0.02 g of 2,2'-azobis-(2- Amidinopropane) dihydrogen chloride and 5 grams of water were mixed.

[0053] The porous membrane was immersed in the monomer aqueous solution for 2 minutes, and the monomer aqueous solution was injected into the micropores of the porous membrane. The film was polymerized at 60°C for 2 hours and then dried. Next, the membrane was washed by immersion in warm water at 60°C to remove unpolymerized material and oligomerized products. The above-mentioned injection, polymerization and washing processes were repeated twice.

[0054] A 60% PTFE dispersion was applied to one side of the resulting electrolyte membrane so that the resulting membrane had a thickness of 1 μm fr...

Embodiment 2

[0060] MEA was prepared as described in Example 1 except that no hydrophilic material layer was formed in the electrolyte membrane.

Embodiment 3

[0062] MEA was prepared as described in Example 1 except that no hydrophobic material layer was formed in the electrolyte membrane.

[0063] conventional embodiment

[0064] MEA was prepared as described in Example 1 except that no hydrophobic and hydrophilic material layers were formed in the electrolyte membrane. it corresponds to figure 2 Conventional example shown.

[0065] Each of the MEAs of Examples 1 to 3 and Conventional Example was used to form a unit cell configured such that a 10% by volume aqueous methanol solution was fed to a fuel electrode without pressure, and air was brought into contact with the air electrode at atmospheric pressure. Its electrical properties were evaluated by measuring the output value and discharge time at 25°C and 5°C. The results are shown in Table 1.

[0066] at 25°C maximum

Output

(mW / cm 2 )

Maximum output at 5°C

Output (mW / cm 2 )

put at 5°C

electricity time

Example 1

28

...

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Abstract

The present invention relates to a membrane electrode assembly comprising a fuel electrode, an air electrode and an electrolyte membrane in which micropores of a porous membrane are filled with a proton conductive polymer, wherein a planar layer is formed on at least one side of the electrolyte membrane , thereby forming a fuel electrode or an air electrode, and the present invention also relates to a DC type fuel cell with the assembly.

Description

technical field [0001] The present invention relates to a fuel cell, in particular to a membrane electrode assembly, a manufacturing method thereof, and a direct type fuel cell with the assembly. Background technique [0002] figure 2 is a schematic cross-sectional view of a membrane electrode assembly (MEA) used in a conventional wet DC type fuel cell. In this figure, 1 is ethanol fuel, 2 is a catalyst layer on the fuel electrode side, 4 is a porous polymer membrane, 5 is a filling site of a proton conductive polymer, and 7 is a catalyst layer on the air electrode side. A wet DC type fuel cell including this membrane electrode assembly (MEA) as a unit has properties suitable as a small and portable fuel cell. [0003] It is well known that in wet-type ion-conducting polymer electrolyte membranes in fuel cells typically operating at 100°C or lower, proton conductivity increases with the number of anionic groups such as sulfonic acid groups on the polymer side chains. Big....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/96H01M8/02H01M8/10
CPCH01M4/8605H01M8/1004H01M8/1011H01M8/1053H01M8/106H01M8/1072H01M8/0289Y02E60/50Y02P70/50H01M4/86H01M4/88
Inventor 清水邦彦西山利彦水越崇
Owner TOKIN CORP
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