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Gas diffusion layer, preparation method and application thereof

A gas diffusion layer and base layer technology, applied in electrical components, fuel cells, electrochemical generators, etc., can solve the problems of low gas permeability, low resistivity, poor gas permeability and conductivity of gas diffusion layer, etc. The effect of high conductivity

Pending Publication Date: 2022-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a gas diffusion layer and its preparation method and application in order to overcome the poor gas permeability and electrical conductivity of the gas diffusion layer in the prior art. Advantages of Low Resistivity

Method used

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preparation example Construction

[0040] In the second aspect, the present invention provides a method of preparing a gas diffusion layer comprising the steps of:

[0041] (1) Mix the hollow porous carbon fiber, hydrophobic agent, and solvent to obtain a coating liquid;

[0042] (2) The coating liquid was coated on the basal layer and then dried and sintered.

[0043] According to the present invention, preferably, the weight ratio of the hollow porous carbon fiber and the hydrophilic agent in the coating liquid is 1: 0.01 to 5, preferably from 1: 0.5 to 3.

[0044] According to the invention, preferably, the weight ratio of the hydrophobic agent and the solvent in the coating liquid is 1: 1 to 50, more preferably from 1: 10-30.

[0045] According to the present invention, preferably, the coating liquid is used such that the load of the hollow porous carbon fiber on the base layer is 0.5-5 mg / cm. 2 Preferably, 1-3 mg / cm 2 .

[0046] According to the present invention, the thickness of the substrate layer is as...

Embodiment 1

[0071] (1) Mix the PTFE emulsion (containing 60% by weight PTFE), isopropanol and deionized water, and the mixing is stirred, and the hollow porous carbon fiber (by the polyacrylonitrile is prepared by electrostatic spinning; the outer diameter is 1 μm, the inner diameter is 0.1μm, aperture of 0.07 μm, specific surface area of ​​200m 2 / g, the porosity is 70%, the resistivity is 0.0015 Ω · cm), and the mixture was 10000 rpm, stirred for 3 hours, wherein the coating liquid, hollow porous carbon fiber and The weight ratio of PTFE is 1: 1; the weight ratio of PTFE and solvent is 1:20.

[0072] (2) The coating liquid is heated at 80 ° C to convert the coating liquid to a viscous carbon fiber paper (thickness of 250 μm) (thickness of 250 μm); then coated with coating hydrophobic treatment Carbon fiber paper was dried at 120 ° C for 3 h to remove the solvent, and then sintered in a nitrogen atmosphere of 3 hours to obtain a gas diffusion layer. The load of the hollow porous carbon fibe...

Embodiment 2

[0075] (1) Mix the PTFE emulsion (including 60% by weight PTFE), isopropyl alcohol and deionized water; the stirring is turned on, and the hollow porous carbon fiber (by the polyacrylonitrile is prepared by electrostatic spinning; the outer diameter is 2 μm, the inner diameter is 0.2 μm, aperture of 0.1 μm, specific surface area of ​​250m 2 / g, the porosity is 80%, the resistivity is 0.002 Ω · cm), and the mixture is 15,000 rpm, stirred at a stirred speed of 4 hours, wherein the coating liquid is obtained, wherein the coating liquid, hollow porous carbon fiber and The weight ratio of PTFE is 1: 3; the weight ratio of PTFE and solvent is 1:30.

[0076] (2) The coating liquid is heated at 80 ° C to convert the coating liquid to a viscous shape after the hydrophobic fiber paper (thickness is 300 μm); the coating is then coated with a coating liquid The carbon fiber paper was dried at 150 ° C for 4 h to remove the solvent, and then sintered at 400 ° C for 4 hours in a nitrogen atmosp...

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Abstract

The invention relates to the technical field of fuel cells, and discloses a gas diffusion layer, a preparation method and application thereof. The gas diffusion layer comprises a substrate layer and a microporous layer on the substrate layer, wherein the microporous layer comprises hollow porous carbon fibers and a water repellent. The preparation method of the gas diffusion layer comprises the following steps: (1) mixing hollow porous carbon fibers, a water repellent and a solvent to obtain a coating solution; and (2) coating a substrate layer with the coating solution, and then drying and sintering. The gas diffusion layer provided by the invention has relatively high gas permeability and relatively low resistivity, and can effectively improve the electrochemical performance of the proton exchange membrane fuel cell when being used in the proton exchange membrane fuel cell.

Description

Technical field [0001] The present invention relates to the technical field of fuel cells, and more particularly to a gas diffusion layer and a preparation method thereof. Background technique [0002] Proton Exchange Membrane Fuel Cell, PEMFC) has high power density, high energy conversion rate, low temperature start, non-pollution, lightweight, etc., can be used as a power system for vehicle, mobile small power supply system and The uninterruptible power supply and dispersion of the electronic device can also be used as emergency power supplies such as military, medical, entertainment venues. [0003] The key components constituting the PEMFC are the membrane electrode three-in-one component MEA (MEMBRANE ELECTRODESSEMBLY), including: proton exchange membrane, catalyst layer, gas diffusion layer. The gas diffusion layer plays a supporting catalyst layer, a stable electrode structure, and provides a gas passage, an electronic passage, and a drain passage for the electrode reacti...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/0234H01M4/88H01M8/1004
CPCH01M4/8657H01M4/8807H01M4/8605H01M8/0234H01M8/1004Y02E60/50Y02B90/10
Inventor 陈辉沈志刚李磊赵微微
Owner CHINA PETROLEUM & CHEM CORP
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