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A kind of flexible graphene carbon film for fuel cell gas diffusion layer and preparation method

A technology of gas diffusion layer and flexible graphite, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of difficult carbon fiber papermaking, complicated papermaking process, and low strength of carbon paper, and achieve easy large-scale continuous production, Excellent air permeability and the effect of preventing the decrease of electrical conductivity

Active Publication Date: 2021-09-21
GUANGDONG GUANHAO HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts the papermaking process, which has good air permeability and greatly reduces the manufacturing cost. However, carbon fiber papermaking is difficult and requires auxiliary wood pulp. The papermaking process is complicated, and the carbon paper obtained by papermaking has low strength and is easy to break. , low conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Add 5kg of diatomite with a particle size of 10 microns, 5kg of urea, 3kg of polyvinyl alcohol, and 1kg of pregelatinized starch into a 200L paddle mixer, set the temperature of the paddle mixer to -80°C, and stir at a speed of 80rpm 15min, urea melts and plasticizes pregelatinized starch and polyvinyl alcohol and forms wet material with diatomaceous earth; Then add 6kg graphene, 10kg particle diameter and be the Ketjen black of 20nm, paddle stirrer stirring speed rises to 300rpm, stirs 10 minutes, so that graphene and new carbon materials evenly adhere to the surface of diatomite; transfer to the cooling disperser to stir and disperse, the stirring speed of the disperser is 550rpm, the cooling disperser uses water as the cooling medium, through cooling and dispersion, the solidification Form composite carbon particles with a particle size of 50 microns;

[0044] (2) Take 30kg of composite carbon particles, 10kg of carbon fibers with a length distribution of 0.5-1mm...

Embodiment 2

[0049] (1) Add 6kg of zeolite powder with a particle size of 10 microns, 3kg of urea, 1kg of polyvinyl alcohol, and 1kg of pregelatinized starch into a 200L paddle mixer, set the temperature of the paddle mixer to 80°C, and stir at a speed of 80rpm for 15 minutes. Urea melts plasticized pregelatinized starch and polyvinyl alcohol and forms wet material with zeolite powder; Then add 5kg graphene, 15kg particle diameter and be the mesoporous carbon of 20nm, paddle stirrer stirring speed rises to 250rpm, stirs 10min, makes Graphene and Ketjen black evenly adhere to the surface of zeolite powder; transfer to the cooling disperser to stir and disperse, the stirring speed of the disperser is 500rpm, the cooling disperser uses water as the cooling medium, and through cooling and dispersion, solidifies to form a particle size of 40 Micron composite carbon particles;

[0050] (2) Take 31kg of composite carbon particles, 15kg of carbon fibers with a length distribution of 0.5-1mm, 3kg o...

Embodiment 3

[0055] (1) Add 8kg of silica airgel with a particle size of 5 microns, 5kg of urea, 2kg of polyvinyl alcohol, and 1kg of pregelatinized starch into a 200L paddle mixer, set the temperature of the paddle mixer to 80°C, and use 120rpm Stir at a speed of 20 minutes, urea melts plasticized pregelatinized starch and polyvinyl alcohol and forms a wet material with silica airgel; then add 6kg graphene, 15kg carbon airgel with a particle size of 50nm, and stir with a paddle mixer Increase the speed to 250rpm, stir for 10min, so that graphene and acetylene black evenly adhere to the surface of the silica airgel; transfer to the cooling disperser to stir and disperse, the stirring speed of the disperser is 650rpm, and the cooling disperser uses water as the cooling medium , through cooling and dispersion, solidify to form composite carbon particles with a particle size of 45 microns;

[0056](2) Take 37kg of composite carbon particles, 15kg of carbon fiber with a length distribution of ...

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Abstract

The invention belongs to the field of fuel cells, and specifically proposes a flexible graphene carbon film for a gas diffusion layer of a fuel cell and a preparation method thereof. The present invention plasticizes gelatinized starch and polyvinyl alcohol with urea, adheres graphene and new carbon materials to porous inorganic powder to form large-particle composite carbon particles, and then combines them with carbon fibers, inorganic fibers, wood fibers, thermoplastic polymers, PTFE micropowder, soluble salt, and lubricant are extruded and granulated; the graphene carbon film prototype sheet is micro-foamed by a diaphragm forming machine; it is drawn and stretched by rollers, and the temperature of three sets of traction rollers is gradually increased at the same time , part of polyvinyl alcohol and gelatinized starch decompose and carbonize to form micropores, while polytetrafluoroethylene micro-powder micro-melts as a bonding proppant to ensure the strength and flexibility of the sheet, and further elutes soluble salts to form micropores to obtain flexibility Graphene carbon film. The graphene carbon film obtained by the method has excellent gas permeability, electrical conductivity, and flexibility, and the preparation process is easy to control, and is easy to scale and continuously produce.

Description

technical field [0001] The invention relates to the field of fuel cell materials, in particular to a flexible graphene carbon film for a fuel cell gas diffusion layer and a preparation method. Background technique [0002] Fuel cells are a new type of power generation. The development of fuel cells is of great significance for improving the environment and implementing sustainable energy development. Traditional combustion is to convert fuel combustion into heat energy, which drives a steam turbine to generate electricity. For example, nearly 70% of coal-fired power plants are consumed in the loss of boilers and turbogenerators. Although fuel cell power generation also uses fuel (hydrogen, methane, natural gas, methanol, ethanol, etc.), the energy is directly converted into electrical energy in the form of chemical energy through a special conversion medium, without burning, and there is no redundant energy In the conversion process, the theoretical energy conversion rate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/86
CPCH01M4/8647H01M4/8807Y02E60/50
Inventor 陈庆曾军堂
Owner GUANGDONG GUANHAO HIGH TECH
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