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Gas diffusion layer as well as preparation method and application thereof

A gas diffusion layer and diffusion layer technology, applied in electrical components, fuel cells, electrochemical generators, etc., can solve the problems of poor mass transfer capacity and air permeability of ultra-thin carbon fiber paper, and achieve the effect of high mechanical strength

Active Publication Date: 2021-02-02
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mass transfer capacity and air permeability of the ultra-thin carbon fiber paper are relatively poor

Method used

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  • Gas diffusion layer as well as preparation method and application thereof
  • Gas diffusion layer as well as preparation method and application thereof
  • Gas diffusion layer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] A kind of preparation method of gas diffusion layer comprises the steps:

[0113] (1) Preparation of the support layer: Laser-drill the carbon nanotube film with a thickness of 20 μm, and then use 3mol / L sulfuric acid to soak at 80°C for 60 minutes to remove the cations in the carbon nanotube film, and obtain the support layer structure Schematic such as figure 1 As shown, it can be seen from the figure that the holes in the support layer are circular holes with a diameter of 35 μm and are regularly arranged, and the porosity of the support layer is 80%;

[0114] (2) Preparation of composite carbon material diffusion layer:

[0115] (a) ultrasonically dispersing PP carbon fibers in pure water to obtain a carbon fiber dispersion;

[0116] (b) Soak single-walled carbon nanotubes in 3mol / L sulfuric acid at 80°C for 8h, centrifuge them with ethanol and pure water, and then ultrasonically mix them with sodium dodecylbenzenesulfonate and pure water in a cell disruptor 3h, ...

Embodiment 2

[0122] The difference from Example 1 is that in step (1) the carbon nanotube film is laser drilled, and the obtained support layer structure schematic diagram is as follows figure 2 As shown, it can be seen from the figure that the holes in the support layer are a first circular hole with a diameter of 100 μm and two second circular holes with a diameter of 40 μm distributed in the first circular hole, wherein the first circular hole The second circular hole is a permeable hole. The porosity of the support layer is 82%.

Embodiment 3

[0124] The difference from Example 1 is that the diameter of the circular hole in the support layer in step (1) is 30 μm, and the porosity of the support layer is 75%.

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Abstract

The invention relates to a gas diffusion layer as well as a preparation method and application thereof. The gas diffusion layer comprises a supporting layer, and a composite carbon material diffusionlayer and a microporous layer which are sequentially arranged on the surface of the supporting layer; the supporting layer is made of a porous material, and the composite carbon material diffusion layer comprises carbon nanotubes and carbon fibers. The support layer provided by the invention has high mechanical strength, and can be used as both a current collector and a diffusion layer frame substrate; the carbon nanotubes and the carbon fibers are mixed, the carbon fibers serve as a base frame, the carbon nanotubes serve as filler of the frame, the requirement for high air permeability of thegas diffusion layer is met, and high mechanical strength is achieved; the microporous layer can fill up pores with different sizes of the diffusion layer, and can also slow down the unevenness phenomenon of the diffusion layer, so that redistribution of water and reaction gas in a flow field and the catalyst layer is realized, the conductivity is increased, and the service life of a battery is prolonged.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a gas diffusion layer, its preparation method and application. Background technique [0002] Fuel cell is one of the clean energy devices. It has a high energy conversion rate and the product is water, so it can be used as a clean energy. Fuel cells are widely used in aerospace, automotive, and electronics industries. Fuel cells can be divided into: proton exchange membrane fuel cells (polymer electrolyte membrane fuel cells), methanol fuel cells, solid oxide fuel cells, phosphoric acid fuel cells, alkali fuel cells, etc. Except for the fuel and electrolyte, most fuel cells have a similar overall structural design. [0003] The fuel cell is converted into electricity by the reaction of hydrogen and oxygen to produce water. Therefore, a large amount of water will be generated during the reaction, which will cause a large recombination of the battery, flood the catalytic lay...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/0234H01M8/0245H01M4/88
CPCH01M4/8657H01M4/8605H01M8/0234H01M8/0245H01M4/8807H01M4/86H01M4/88Y02E60/50
Inventor 周小春卫俊
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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