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Composite anode for direct methanol fuel cell and method for making the same

A methanol fuel cell and composite anode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low power density of fuel cell systems, slow methanol electrooxidation rate, poor performance of battery systems, etc., to improve performance and Its stability, increased maximum power density, and ease of handling

Inactive Publication Date: 2008-10-15
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many scientific and technical problems to be solved in order to achieve practical application of direct methanol fuel cells. There are two main technical problems: (1) the methanol electrooxidation rate is slow
However, when a low-concentration methanol solution is used as fuel, the transport speed of the methanol solution inside the electrode is limited, causing the battery to be controlled by mass transfer at a relatively low current, making the power density of the fuel cell system very low
The direct formic acid fuel cell also has the problem of limited mass transfer. The catalytic oxidation of formic acid on the surface of the catalyst is very fast. If the mass transfer cannot keep up, it will directly lead to poor performance of the battery system.

Method used

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  • Composite anode for direct methanol fuel cell and method for making the same
  • Composite anode for direct methanol fuel cell and method for making the same
  • Composite anode for direct methanol fuel cell and method for making the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 Different carbon materials are used as preparation and application of anode MPL

[0025] 1. Weigh 19.8mg of Vulcan XC-72 into container a, put 19.7mg of MWNTs into container b, add 9.8mg of Vulcan XC-72 and 9.8mg of MWNTs into container c, and then add 40mg of mass hundreds of A PTFE emulsion with a concentration of 12.4wt% and a mixture of 1 mL of water and isopropanol (the volume ratio of isopropanol to water is 1:1) were used as a binder and a dispersant, and ultrasonically dispersed for 2 hours to obtain a uniform slurry.

[0026] 2. take by weighing 80.3mg Pt-Ru black, add 100mg ultrapure water after all catalysts are wetted, add the Nafion solution that 267.3mg mass ratio concentration is 5.3wt%, then add the mixed solution of 3mL water and isopropanol (isopropanol The volume ratio of propanol and water is 1:1) as a dispersant, and the temperature is controlled below 40°C for ultrasonic dispersion for 2 hours.

[0027] 3. Take 3 pieces of carbon pape...

Embodiment 2

[0031] Example 2 Preparation and application of different types of carbon nanotubes as anode MPL

[0032] 1. Weigh 20mg of S.MWNTs, L.MWNTs, L.SWMTs, L.DWNTs (where S means short tube, L means long tube, and the carbon nanotubes used are all products of Shenzhen Nanometer Port Co., Ltd., with a purity greater than 95 %) is placed in container A, B, C, D, then respectively in 4 containers, add 40mg mass ratio concentration and be the mixed solution of 12.4wt.% PTFE emulsion and 1mL water and isopropanol (the mixture of isopropanol and water The volume ratio is 1:1) as the binder and dispersant, and the uniform slurry can be obtained by ultrasonic dispersion for 2 hours.

[0033] 2. take by weighing 110mg Pt-Ru black, add 140mg ultrapure water after all catalysts are wetted, add the Nafion solution that 367mg mass ratio concentration is 5.3wt.%, then add the mixed solution of 4mL water and isopropanol (isopropanol The volume ratio of alcohol and water is 1:1) as a dispersant, a...

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Abstract

The invention provides a composite anode of a direct-methanol fuel cell and a manufacturing method thereof. The invention is characterized in that the composite anode is composed of a supporting layer, a diffusion layer and a catalyzing layer, wherein, the diffusion layer is the structure of a network channel which is composed of carbon nano-tubes. The typical characteristics of the preparation process are that: (1) a certain amount of the carbon nano-tubes or the carbon nano-tubes added with a certain amount of other carbon materials are dispersed in isopropanol aqueous solution to obtain a sizing agent (A); (2) a certain amount of polyfluortetraethylene latex is added into the (A) and evenly dispersed to form serosity (B); (3) the (B) is evenly coated on the supporting layer, and the diffusion layer (C) loaded by the supporting layer is formed after 300-350 DEG C high-temperature roasting; (4) the (C) is coated with a layer of PtRu catalyst and then heat pressed with a cathode and a Nafion membrane to obtain a membrane electrode aggregation (MEA). Therefore, the transmission efficiency of the fuel at the anode is improved and the internal resistance of the battery is reduced so as to enhance the power density and service life of the battery.

Description

technical field [0001] The invention relates to a composite anode for direct methanol fuel cells and a manufacturing method thereof, more specifically to a composite anode capable of improving the performance and stability of direct methanol fuel cells and a manufacturing method thereof, the use of the composite anode can improve the performance of liquid fuel The mass transfer efficiency effectively improves the performance and stability of the battery. Background technique [0002] In the past ten years, with the rapid development and popularization of portable electronic products (such as mobile phones, handheld computers, MP3, etc.), users' demands for high specific energy chemical power sources have become increasingly louder. In order to meet the high energy density requirements of various new microelectronic products, since the mid-1990s, many well-known companies and scientific research institutions around the world have been trying to develop low-power fuel cells, h...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 杨辉袁婷黄庆红邹志青杜翀夏保佳
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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