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Gas diffusion layer of proton exchange membrane fuel cell and its preparation method

A gas diffusion layer and proton exchange membrane technology, which is applied to fuel cell components, fuel cells, electrical components, etc., can solve the problems of easy blockage of pores in the microporous layer, time-consuming, complicated process, etc. The effect of large-scale production, reduction of preparation process, and wide source of materials

Active Publication Date: 2016-08-17
KUSN INNOVATION INST OF NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages: ①This technology adopts the method of carrying carbon powder on the metal mesh to treat the metal surface. Since the surface of the metal mesh is relatively smooth, the carbon powder has weak adhesion and is easy to fall off. Under the impact, the carbon powder is easier to peel off, and the peeled carbon powder is easy to block the pores of the microporous layer, affecting the water vapor transmission of the membrane electrode, and then affecting the performance of the membrane electrode
②The metal substrate of this technology needs to be treated with hydrophobicity. On the one hand, the hydrophobic treatment requires high-temperature sintering, and inert gas protection is required to prevent the oxidation of the metal substrate under high temperature conditions. The process is complex and time-consuming, which is not conducive to production; Hydrophobic treatment will reduce the conductivity of the metal mesh
③This technology adopts the method of direct spraying, dipping coating, scraping coating or screen printing on the surface of the metal mesh to prepare the microporous layer. First of all, this method has higher requirements on the pore diameter of the metal mesh, and the pore diameter should not be too large, otherwise the slurry will be easy to Leakage occurs; secondly, the metal mesh needs to be sintered together with the microporous layer, which may cause partial oxidation under the condition of an uncommon atmosphere; thirdly, the microporous layer is prepared directly on the metal mesh, which is troublesome to operate and is not conducive to production
Disadvantages: ① This technology uses carbon fiber material as the base, which is expensive, and the carbon fiber material is mainly carbon paper or carbon cloth, which is easily damaged during use and has high requirements for transportation
There are disadvantages: the metal matrix prepared by this method is complicated to operate, and the interlayer and graphite layer are prepared by ion plating on the metal fiber, and the price is relatively high
PTFE hydrophobically treats the surface of the metal, which affects the conductivity of the metal

Method used

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  • Gas diffusion layer of proton exchange membrane fuel cell and its preparation method
  • Gas diffusion layer of proton exchange membrane fuel cell and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Adopting aperture is 0.15mm, the nickel mesh that thickness is 0.2mm is used as substrate, after its surface is cleaned, adopts vacuum evaporation method to plate the carbon that one deck thickness is 0.003 millimeter on its surface, prepares the gas diffusion layer base.

[0035] (2) ①Weigh 10g of acetylene black, and gradually disperse it in 40ml 5% X-100 by cell crushing; ②Weigh 7.14g of 60% PTFE solution, add 4g of water to dilute, then add dropwise to ① In the acetylene black slurry, prepare a slurry with a PTFE load of 30%; ③ take 8g of silicon dioxide and 8g of ammonium chloride and dissolve them in ②; ④ take 20g PEG-600 and add it dropwise to the above ③, drop After the addition was complete, ultrasonication was performed for 30 minutes to obtain a carbon material slurry.

[0036] (3) Prepare a microporous layer on a carbon fiber fabric with a thickness of 0.003 mm by scraping the prepared carbon material slurry. The scraping thickness of the microporous la...

Embodiment 2

[0041] (1) A nickel mesh with an aperture of 0.3 mm and a thickness of 0.15 mm is used as the substrate. After the surface is cleaned, a layer of carbon with a thickness of about 0.003 mm is plated on the surface by vacuum evaporation to obtain a gas diffusion layer. base.

[0042] (2) ① Weigh 15g of acetylene black, and gradually disperse it in 90ml 3% X-100 by means of cell crushing; ②Weigh 6.24g of 60% PTFE solution, add 3g of water to dilute, and add dropwise to ① In the acetylene black slurry, prepare a slurry with a PTFE load of 20%; ③ take 9g of silicon dioxide and 9g of ammonium chloride and dissolve them in ②; ④ take 36g PEG-600 and add it dropwise to the above ③, drop After the addition was complete, ultrasonication was performed for 30 minutes to obtain a carbon material slurry.

[0043] (3) Prepare a microporous layer on a carbon fiber fabric with a thickness of 0.006 mm by scraping the prepared carbon material slurry. The scraping thickness of the microporous lay...

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Abstract

The invention discloses a gas diffusion layer of a PEMFC (Proton Exchange Membrane Fuel Cell). The gas diffusion layer comprises a substrate and a micropore layer, wherein the substrate is a porous metal net of which the surface is provided with an electroplating layer; the pore diameter of the porous metal net is 0.076-0.4mm, and the thickness of the porous metal net is 0.01-0.4mm; the micropore layer is formed by coating carbon black slurry on the surface of a carbon fiber fabric, and the substrate and the micropore layer are overlapped and then laminated into a whole. The preparation method comprises the following steps of: overlapping the sintered micropore layer and one or more layers of treated porous metal nets, and then pressing, thereby obtaining the gas diffusion layer which utilizes the metal net as the substrate. The preparation method is simple process and convenient to operate.

Description

technical field [0001] The invention belongs to a proton exchange membrane fuel cell, in particular to a gas diffusion layer of the proton exchange membrane fuel cell. Background technique [0002] The gas diffusion layer is one of the important core components of the proton exchange membrane fuel cell. It plays the role of water vapor transmission, supporting the catalytic layer and collecting current in the membrane electrode. Therefore, it plays a key role in the proton exchange membrane fuel cell. The composition of the gas diffusion layer includes a substrate and a microporous layer. At present, the base of the gas diffusion layer for fuel cells at home and abroad mostly uses carbon fiber to prepare carbon paper or carbon cloth. After the base is pretreated by hydrophobicity and leveling, a microporous layer is prepared on the surface. Spraying and other processes. The preparation process of the gas diffusion layer substrate prepared by this method is cumbersome and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M4/86H01M8/0297
CPCY02E60/50
Inventor 陈佳顾军邹志刚黄林徐晓燕张峰雷一杰朱守圃
Owner KUSN INNOVATION INST OF NANJING UNIV
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