Check patentability & draft patents in minutes with Patsnap Eureka AI!

Novel gas diffusion layer for fuel cell as well as preparation method and application of novel gas diffusion layer

A gas diffusion layer and fuel cell technology, which is applied to fuel cells, fuel cell parts, electrical components, etc., can solve the problems of not considering the influence of pore structure drainage effect, flooding, insufficient reaction, etc., to increase drainage. The effect of moisturizing effect, improving mass transfer efficiency, and enhancing drainage performance

Pending Publication Date: 2022-04-01
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microporous layer of this type of gas diffusion layer is tested by mercury porosimetry, and the difference between closed holes, half-through holes, and through holes cannot be identified, which will cause the following problems: Although the gas diffusion layer has a large porosity, the gas diffusion layer In the plane, the air flow is difficult to distribute evenly; in addition, the effective gas flow is limited perpendicular to the direction of the gas diffusion layer, which is likely to cause insufficient reaction, flooding, and hinder the effective transmission of current
This type of gas diffusion layer is only designed in the direction of the hydrophobic gradient, without considering the effect of the pore structure on the drainage effect, and using ammonium carbonate, ammonium bicarbonate, lithium carbonate, etc. as pore-forming agents, it is difficult to form an effective gradient and effective through-pore structure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Novel gas diffusion layer for fuel cell as well as preparation method and application of novel gas diffusion layer
  • Novel gas diffusion layer for fuel cell as well as preparation method and application of novel gas diffusion layer
  • Novel gas diffusion layer for fuel cell as well as preparation method and application of novel gas diffusion layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Step 1: The particle size is 25nm, the specific surface area is 120m 2 The carbon black (60 parts) of / g is dissolved in isopropanol, through sonication, forms stable suspension, then adds the PTFE emulsion (25 parts) that solid content is 60% successively, diameter is 0.6 μ m, aspect ratio is 20, the bending stiffness is 8.5×10 -4 cN cm 2 The PLA fiber (5 parts), viscosity is the paste (10 parts) after the PVP water absorption of 1.2Pa s, mixes and stirs, obtains the microporous layer slurry;

[0044] Step 2: Use a coating machine to evenly coat the microporous layer slurry prepared in step 1 on one side of the hydrophobic carbon paper (the surface contact angle is 135°), dry at 100°C, and repeat the coating and drying for 3 Second, make a microporous layer with a thickness of 36 μm;

[0045] Step 3, after drying, place it under the protection of nitrogen for two-stage high-temperature sintering, the first stage temperature is 250°C, and the time is 30 minutes; the ...

Embodiment 2

[0048] Step 1: The particle size is 25nm, the specific surface area is 120m 2 The carbon nanotubes (20 parts) and carbon black (40 parts) of / g are dissolved in ethanol, are processed through ball milling, form stable suspension, add the PTFE (25 parts) emulsion that solid content is 55% again successively, diameter is 0.6 μm, the aspect ratio is 20, and the bending stiffness is 8.5×10 -4 cN cm 2 PLA fiber (1 part), viscosity is the paste (14 parts) after the HPMC water absorption of 3.94Pa s, mix and stir, obtain microporous layer slurry;

[0049] Step 2: Use a coating machine to evenly coat the microporous layer slurry prepared in step 1 on the surface of one side of the hydrophobic carbon paper (the surface contact angle is 138), dry at 100°C, and repeat the coating and drying steps. In the future, PLA will be increased by 1 part and carbon black will be reduced by 1 part each time in the slurry, for a total of 6 times to make a microporous layer with a thickness of 53 μm...

Embodiment 3～7

[0053] The specific implementation steps are the same as in Example 1, wherein different performance parameters are listed in Table 1, and different preparation schemes are listed in Table 2.

[0054] Table 1 Gas diffusion layer parameter list

[0055]

[0056]

[0057] Table 2 Microporous layer preparation scheme table

[0058] Coating method Coating layers Drying temperature (℃) Sintering atmosphere, temperature (℃) comparative example coating machine 3 100 Nitrogen, 250, 350 Example 1 coating machine 3 100 Nitrogen, 250, 350 Example 2 coating machine 6 50 Nitrogen, 260, 370 Example 3 spray gun 2 120 air, 210, 330 Example 4 coating machine 10 80 oxygen, 260, 380 Example 5 scraper 1 80 Helium, 245, 365 Example 6 scraper 6 100 Argon, 250, 350 Example 7 spray gun 2 70 air, 230, 340

[0059] Table 3 Gas diffusion layer performance test table

[0060]

[0061] I...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Specific surface areaaaaaaaaaaa
Diameteraaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of hydrogen fuel cells, and particularly relates to a novel gas diffusion layer for a fuel cell and a preparation method and application of the novel gas diffusion layer. Dissolving the carbon powder particles in a solvent under the action of ultrasound, ball milling, yarn milling or high-speed shearing to form a stable suspension, then sequentially adding a water repellent agent emulsion, pore-increasing fibers and a thickening adhesive, and mixing and stirring to obtain microporous layer slurry; uniformly coating the surface of one side of the substrate layer with prepared microporous layer slurry, and drying to prepare a microporous layer; and sintering under a protective atmosphere to obtain the gas diffusion layer for the fuel cell. According to the invention, the easily degradable fibers are added into the microporous layer, and through pore channels can be formed through high-temperature sintering, so that the proportion of non-through pores in the microporous layer can be greatly reduced, and the mass transfer efficiency and the drainage performance of the fuel cell during working are improved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen fuel cells, and in particular relates to a novel fuel cell gas diffusion layer and its preparation method and application. Background technique [0002] A fuel cell is a type of battery that converts chemical energy into electrical energy through an electrochemical reaction. A hydrogen fuel cell uses hydrogen and oxygen as fuel and water as a product. From the perspective of energy consumption and environmental pollution, it can truly achieve zero emissions. Low pollution, has very good application prospects. [0003] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy. Its core component, the membrane electrode, is mainly composed of a proton exchange membrane, a catalyst, and a gas diffusion layer. Among them, the gas diffusion layer not only plays the role of supporting the catalyst layer and stabilizing the electrode structure in the ele...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M8/0245H01M8/023H01M8/0228H01M8/0202
CPCY02E60/50
Inventor 吴刚平朱宏刘玉婷
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com