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Cathode structure of membrane electrode assembly of direct alcohol fuel cell and manufacturing method

A fuel cell and membrane electrode technology, which is applied to fuel cell components, fuel cells, battery electrodes, etc., can solve the problems of battery performance degradation, power density not reaching the practical level, and troubles for practical applications, etc. Minimizes loss, improves oxygen transmission efficiency, and is easy to operate

Inactive Publication Date: 2010-03-03
上海新微科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DMFC has a high energy density and is easy to operate, but methanol is easy to permeate the Nafion membrane, resulting in the mixed potential effect of the cathode, which reduces the performance of the battery
And the cathode flooding problem caused by the use of low concentration methanol as fuel also plagues its practical application
As far as the current status of battery development is concerned, their power density has not yet reached the level of practical use, and the battery life needs to be further improved.

Method used

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  • Cathode structure of membrane electrode assembly of direct alcohol fuel cell and manufacturing method
  • Cathode structure of membrane electrode assembly of direct alcohol fuel cell and manufacturing method
  • Cathode structure of membrane electrode assembly of direct alcohol fuel cell and manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1 The preparation method of the MEA of the double microporous layer cathode structure of the direct methanol fuel cell

[0025] 1. Weigh 20mg of Vulcan XC-72R and 50mg of 10.0% PTFE emulsion in mass percentage concentration and disperse in 0.3mL of water and isopropanol mixture (the volume ratio of isopropanol and water is 1:1), ultrasonic After dispersing for 6 hours, a uniform carbon slurry (A) can be obtained. Similarly, take 20mg of Vulcan XC-72R and 67mg mass percent concentration and be dispersed in the mixed solution of 0.3mL water and isopropanol (the volume ratio of isopropanol and water is 1: 1), A uniform carbon slurry (B) can be obtained by ultrasonic dispersion for 6 hours. Weigh 20mg of Ketjen Black and 200mg of 10.0% PTFE emulsion in mass percentage concentration and disperse in 0.5mL of water and isopropanol mixture (the volume ratio of isopropanol and water is 1:1), and ultrasonically disperse for 6h. A homogeneous carbon slurry (C) is obta...

Embodiment 2

[0032] Example 2 Influence of the Binder of the Microporous Layer in the Double Microporous Layer Cathode of Direct Methanol Fuel Cell and the Preparation Method of MEA

[0033] 1. Weigh 80mg of Vulcan XC-72R and 200mg of 10.0% PTFE emulsion by mass percent and disperse them in a mixture of 1.2mL water and isopropanol (the volume ratio of isopropanol and water is 1:1), and ultrasonically After dispersing for 6 hours, a uniform carbon slurry (A) can be obtained. Similarly, take 80mg of Vulcan XC-72R and 268mg mass percentage concentration and be dispersed in the mixed solution of 1.2mL water and isopropanol (the volume ratio of isopropanol and water is 1: 1), A uniform carbon slurry (B) can be obtained by ultrasonic dispersion for 6 hours. Weigh 20 mg of Ketjen Black and 85.7 mg of PTFE emulsion with a concentration of 10.0% by mass and disperse them in a mixed solution of 0.4 mL of water and isopropanol (the volume ratio of isopropanol and water is 1:1), and ultrasonically di...

Embodiment 3

[0039] Example 3 Influence of microporous layer carbon material in double microporous layer cathode of direct methanol fuel cell and preparation method of MEA

[0040]1. Weigh 80mg of Vulcan XC-72R and 200mg of 10.0% PTFE emulsion by mass percent and disperse them in a mixture of 1.2mL water and isopropanol (the volume ratio of isopropanol and water is 1:1), and ultrasonically After dispersing for 6 hours, a uniform carbon slurry (A) can be obtained. Similarly, take 80mg of Vulcan XC-72R and 268mg mass percentage concentration and be dispersed in the mixed solution of 1.2mL water and isopropanol (the volume ratio of isopropanol and water is 1: 1), A uniform carbon slurry (B) can be obtained by ultrasonic dispersion for 6 hours. Weigh 20mg of Ketjen Black and 200mg of 10.0% PTFE emulsion in mass percentage concentration and disperse in 0.5mL of water and isopropanol mixture (the volume ratio of isopropanol and water is 1:1), and ultrasonically disperse for 6h. A homogeneous c...

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Abstract

The invention provides a cathode structure of a membrane electrode assembly (MEA) of a direct alcohol fuel cell and a manufacturing method. The cathode is in a double-micropore layer structure which obviously improves the performance and the stability of the MEA. The manufacturing process is characterized by comprising the following steps: (1) dispersing carbon powder and polytetrafluoroethylene (PTFE) emulsion in an isopropyl alcohol solution to form uniform slurry, changing the type of the carbon powder and the content of the PTFE in the slurry, and obtaining the slurry of different component proportions; (2) coating the slurry on a supporting layer by a spraying way, and the like, to form an anode micropore layer, and sequentially coating the two kinds of slurry of different component proportions on the same supporting layer by the same way to form a cathode double-micropore layer; (3) coating the ink which comprises catalysts and Nafion on the anode micropore layer or the cathode double-micropore layer by the spraying way, and the like, to form a cathode or an anode; and (4) hot-pressing the anode, the Nafion membrane and the cathode to obtain the MEA. The structure increases the oxygen transmission of the cathode and the inverse diffusion of water, and obviously improves the power density and the stability of the cell.

Description

technical field [0001] The present invention relates to a direct alcohol fuel cell membrane electrode assembly structure and a manufacturing method, in particular to a cathode structure of a direct alcohol fuel cell membrane electrode assembly. The use of the manufacturing method can improve the fuel cell membrane electrode assembly The oxygen transmission efficiency and water return ability of the body can effectively improve the performance and stability of the battery. Background technique [0002] Fuel cells have high energy conversion efficiency and energy density, low pollution, and are ideal power sources in the future. Therefore, they have attracted extensive attention from all over the world. In recent years, all countries in the world have invested a lot of manpower, material and financial resources in research. In the past ten years, with the rapid popularization of various portable electronic products (such as mobile phones, handheld computers, MP3, etc.), users ...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M4/96H01M4/88H01M8/1004
CPCY02E60/50Y02P70/50
Inventor 杨辉曹剑瑜陈梅邹志青黄庆红杜翀
Owner 上海新微科技集团有限公司
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