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Gas diffusion layer with gradient hole structure and preparation and applications thereof

A gas diffusion layer and gradient hole technology, which is applied to the components of fuel cells, etc., can solve problems such as water shortage in the cathode, and achieve the effects of reducing body resistance, easy control, and increasing conductivity.

Active Publication Date: 2012-05-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The object of the present invention is to provide a gas diffusion layer with good water retention capacity and its preparation method, to solve the technical problem of water shortage in alkaline anion exchange membrane fuel cells and proton exchange membrane fuel cell cathodes under lower humidification operating conditions

Method used

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  • Gas diffusion layer with gradient hole structure and preparation and applications thereof
  • Gas diffusion layer with gradient hole structure and preparation and applications thereof
  • Gas diffusion layer with gradient hole structure and preparation and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Dilute the 60% polytetrafluoroethylene emulsion to 2% with deionized water, then put Ballard EP40 (air permeability 4.5s / 100ml) into the prepared PTFE emulsion for 5 minutes, take it out, and dry it in an oven at 80°C After that, the second impregnation, drying and other treatments are carried out, and the mass content of PTFE in the carbon paper is calculated by weighing method until the mass content of PTFE reaches 20%. Finally, the carbon paper was sent to a 350°C roasting furnace for 40 minutes.

[0058] Take conductive carbon black 1.0g, add 25g ethylene glycol, after ultrasonic stirring 30min, according to the ratio of conductive carbon black: PTFE=1: 1, the 10% PTFE emulsion of calculated consumption is added in the slurry of conductive carbon black, continue Sonicate and stir for 30 min before use.

[0059] Fix the PTFE-treated carbon paper on the platform of the screen printing machine to ensure that the printing area is 150*200(mm 2 ), by adjusting the dista...

Embodiment 2

[0065] Dissolve and dilute polyvinylidene fluoride with a concentration of 60% to 2% with N,N-dimethylpyrrolidone, and then put Toray TGP-H-090 (air permeability 6.62s / 100ml) into the prepared PVDF solution Take it out after soaking for 5 minutes, dry it in an oven at 80°C, and then perform the second impregnation and drying treatment. The mass content of PVDF in carbon paper is calculated by weighing method until the mass content of PVDF reaches 20%. Finally, the carbon paper was sent to a 190°C roasting furnace for 40 minutes.

[0066] Take by weighing conductive carbon black (particle size is 30nm) 0.6g, add 30gNMP, after ultrasonic stirring 30min, according to the ratio of conductive carbon black: PVDF=6: 4, the 5% PVDF solution of calculated consumption is added in the slurry of conductive carbon black , continue to sonicate and stir for 30 minutes before use.

[0067] The transition hole layer and the microporous layer are prepared by spraying. Fix the PVDF-treated car...

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Abstract

The invention relates to a gas diffusion layer with a gradient hole structure for fuel batteries and a preparation method and applications thereof. The gas diffusion layer consists of a macroporous carbon-based support body and a micro-porous layer which are overlapped, wherein the material of the micro-porous layer is embedded in the macroporous carbon-based support body from one side, far from the flow field of a battery, of the macroporous carbon-based support body to form a transitional hole layer; the transitional hole layer is composed of the material of the micro-porous layer and the fiber of the macroporous carbon-based support body and is obtained by embedding the material of the micro-porous layer in the side, far from the flow field of a battery, of the macroporous carbon-based support body; and the curvature of reaction gas transfer from the side next to the flow field to the side next to a catalyst layer in the gas diffusion layer increases gradiently and the air permeability gradually reduces from 4-10s / 100ml to 100-900s / 100ml. By adopting the gas diffusion layer with the structure, the mass transfer curvatures of water and the gas in the gas diffusion layer (GDL) can be effectively increased, the transfer path of the product-water can be prolonged and liquid water in the battery can be maintained; and the gas diffusion layer is particularly suitable for fuel batteries working under low humidity and the cathodes of alkaline fuel batteries.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a gas diffusion layer with a gradient pore structure and a preparation method thereof. Background technique [0002] A fuel cell is an electrochemical power generation device, which has outstanding advantages such as high energy conversion efficiency (40-60%), environmental friendliness, etc., and has broad application prospects. It can start at low temperature, has no electrolyte corrosion and leakage, has a simple structure, and is easy to operate. It has a strong competitive advantage in the fields of electric vehicles, regional power stations, spacecraft, and portable power supplies. The development of such underwater deep submersibles is very attractive and has attracted widespread attention in recent years. [0003] Alkaline anion exchange membrane fuel cell (AAEMFC) refers to a fuel cell that uses an alkaline polymer electrolyte as a charge transfer carrier, also referred to as an alkaline ...

Claims

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Application Information

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IPC IPC(8): H01M8/02
CPCY02E60/50
Inventor 张华民邱艳玲董明全张凤祥曲超
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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