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Direct methanol fuel cell membrane electrode and preparation and application

A methanol fuel cell and fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of fuel permeation characteristics changing the cathode material transport process, difficult to meet the application requirements of performance and life, to eliminate catalyst poisoning, The effect of improving the fuel utilization rate and reducing the internal resistance of the battery

Pending Publication Date: 2021-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in direct methanol fuel cells, since the anode is fed with liquid methanol aqueous solution, its fuel permeation characteristics significantly change the material transport process of the cathode, and its electrode structure optimization strategy is completely different from that of traditional noble metal-based fuel cells.
At present, direct methanol fuel cells using non-precious metal-based cathode catalysts are still difficult to meet the application requirements of performance and lifetime

Method used

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  • Direct methanol fuel cell membrane electrode and preparation and application
  • Direct methanol fuel cell membrane electrode and preparation and application
  • Direct methanol fuel cell membrane electrode and preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] a. Preparation of gas diffusion electrode

[0040] A certain mass of carbon nanotubes and a certain mass of polytetrafluoroethylene are mixed evenly according to the mass ratio of 4:1, and a certain mass of water is added to disperse evenly, and the solid content of the slurry is 10%.

[0041]After the above-mentioned slurry is uniformly dispersed by ultrasonic, the next step of dispersion is carried out by using shear force stirring equipment, the linear speed of the stirring rotor is 30m / s, the temperature is 50°C, and the stirring time is 10min. After uniform dispersion, the ultra-thin gas diffusion layer is prepared by filtration. Spread the filter membrane with a pore size of 20nm to the bottom of the funnel, and vacuum filter the prepared slurry, so that the solid surface density is 100 μg / cm according to the area of ​​the filter membrane 2 , After fully drying, it is peeled off for use. The average thickness is about 12 μm, and the measured porosity is about 78%...

Embodiment 2

[0067] a. Preparation of gas diffusion electrode

[0068] Mix a certain quality of carbon fiber and carbon nanotubes (mass ratio is 1:1), and a certain quality of polytetrafluoroethylene according to the mass ratio of 4:1, and add a certain quality of water to disperse evenly, and the solid content of the slurry is 10 %.

[0069] After the above-mentioned slurry is uniformly dispersed by ultrasonic, the next step of dispersion is carried out by using shear force stirring equipment, the linear speed of the stirring rotor is 30m / s, the temperature is 50°C, and the stirring time is 10min. After uniform dispersion, the ultra-thin gas diffusion layer is prepared by filtration. Spread the filter membrane with a pore size of 20nm to the bottom of the funnel, and vacuum filter the prepared slurry, so that the solid surface density is 400 μg / cm according to the area of ​​the filter membrane 2 , After fully drying, it is peeled off for use. The average thickness is about 46 μm, and th...

Embodiment 3

[0075] a. Preparation of gas diffusion electrode

[0076] Mix a certain quality of carbon fiber and carbon nanotubes (mass ratio is 3:1), and a certain quality of polytetrafluoroethylene according to the mass ratio of 4:1, and add a certain quality of water to disperse evenly, and the solid content of the slurry is 10 %.

[0077] After the above-mentioned slurry is uniformly dispersed by ultrasonic, the next step of dispersion is carried out by using shear force stirring equipment, the linear speed of the stirring rotor is 30m / s, the temperature is 50°C, and the stirring time is 10min. After uniform dispersion, the ultra-thin gas diffusion layer is prepared by filtration. Spread the filter membrane with a pore size of 20nm to the bottom of the funnel, and vacuum filter the prepared slurry, so that the solid surface density is 1000 μg / cm according to the area of ​​the filter membrane 2 , After being fully dried, it is peeled off for use. The average thickness is about 79 μm, ...

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Abstract

A direct methanol fuel cell membrane electrode is prepared, the membrane electrode has an anode gas diffusion layer structure of which the thickness is greatly reduced compared with that of a traditional membrane electrode gas diffusion layer, the thickness of the diffusion layer is about 1 / 2 to 1 / 50 of that of the traditional diffusion layer, and the membrane electrode has a non-noble metal catalyst supported cathode structure. The anode gas diffusion layer material of the electrode with the structure is composed of carbon fibers, carbon nanotubes, a binder and the like, a cathode catalyst is composed of non-noble metal catalysts such as transition metal and / or a nitrogen-doped carbon material and the like and a binder, and the electrode can be used as a direct liquid fuel cell membrane electrode.

Description

technical field [0001] The present invention relates to a novel direct methanol fuel cell membrane electrode and a preparation method thereof. Specifically, the membrane electrode has an anode structure whose gas diffusion layer thickness is greatly reduced compared with a traditional membrane electrode, and a cathode structure supported by a non-precious metal catalyst. It can be used in electrodes such as direct methanol and other direct liquid fuel cells. [0002] The present invention also relates to a method for preparing the above-mentioned membrane electrode. Background technique [0003] Direct methanol fuel cell is an energy conversion device that directly converts the chemical energy of liquid methanol into electrical energy. Due to its high energy density and energy conversion efficiency, it is considered to be a new type of mobile power supply technology with great potential in the future. It has broad application prospects in the national defense field. But at...

Claims

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Application Information

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IPC IPC(8): H01M8/1004H01M8/1011
CPCH01M8/1004H01M8/1011Y02E60/50
Inventor 王素力夏章讯孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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