A fuel cell integrated diffusion layer and its preparation method and application

A fuel cell and gas diffusion layer technology, which is applied in the field of fuel cell gas diffusion layers, can solve the problems of low conductivity of asphalt-based CFs, and achieve the effects of reducing preparation cost, facilitating material distribution, and overcoming brittleness.

Active Publication Date: 2022-05-24
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the relatively low conductivity of pitch-based CFs limits its wide application. In recent years, researchers have proposed several methods to improve the conductivity of pitch-based CFs by adding various nanofillers, adding nanoporous carbon materials to composite materials. , not only improve the porosity of the material, but also have a positive impact on the physical and chemical properties of CFs due to the porosity of the carbon material itself and the network structure formed between two or more materials [9]

Method used

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  • A fuel cell integrated diffusion layer and its preparation method and application
  • A fuel cell integrated diffusion layer and its preparation method and application
  • A fuel cell integrated diffusion layer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Preparation of one-piece diffusion layer

[0036] Weigh 45mg of multi-walled carbon nanotubes in a 100mL high beaker, add 45mL nitrogen methyl pyrrolidone (NMP) as a dispersant (about 1mg mL -1 ), ultrasonicated for 1 h, dispersed with a high-speed disperser for 3 min at a speed of 20,000 rmp, as solution A; weighed 15 mg of carbon fiber, added 45 ml of NMP (1 / 3 mg mL -1 ), sonicated for 30 min, as solution B; poured A into solution B, added 6 mg of PTFE slurry (10%), sonicated in an ultrasonic cleaner for 1 h, stirred at 20,000 rpm for 3 min, and then used suction filtration prepared in advance The device was quickly filtered to form a membrane, and the filter membrane was a PTFE membrane (45 μm). Then vacuum drying at 130 °C, and finally the preformed diffusion layer was placed in a high-temperature tube furnace at 350 °C for 3 hours, which is a new type of integrated diffusion layer (GDL / CNT-CF). The schematic diagram of the preparation method is as follo...

Embodiment 2

[0038] Preparation of GDL / Toray-060H: Take commercial Toray-060H carbon paper as the anode and cathode diffusion layer substrate, take an appropriate amount of polytetrafluoroethylene (PTFE) and carbon powder (XC-72), stir evenly to form a mixed slurry, and then pass Coating method Coating on the base layer to prepare the microporous layer. The loadings of XC-72R and PTFE in the anode / cathode microporous layer were 2 mg cm, respectively -2 , 10wt% and 2mgcm -2 , 40wt%.

Embodiment 3

[0040] The JSM-6360LV field emission scanning electron microscope (SEM) of JOEL company was used to characterize the structure and microscopic morphology of the diffusion layer prepared in Example 1, and compared with the commercial diffusion layer in Example 2. The comparison results are as follows image 3 shown.

[0041] It can be seen from the front micro-morphology that the carbon nanotubes are very uniformly dispersed and scattered, and the PTFE pellets are evenly embedded on the carbon nanotubes; Some larger holes are formed between the carbon fibers; from the cross-sectional comparison diagram, the thickness of the new GDL is only 120 nm, which is about 1 / 2 of the commercial diffusion layer. More carbon nanotubes can directly act as a microporous layer, in contact with the catalytic layer, while the bottom has more carbon fibers, and the pore structure gradually increases. The large pores are conducive to the transport of water, while the small hydrophobic pores keep t...

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Abstract

The invention relates to a fuel cell gas diffusion layer, in particular to an integrated diffusion layer and its preparation method and application. The preparation method of the present invention uses carbon fiber as the skeleton, composites multi-walled carbon nanotubes, uses nitrogen methyl pyrrolidone as the dispersant to disperse at high speed, polytetrafluoroethylene (PTFE) as the binder and water-repellent agent, and adopts vacuum suction filtration molding method A new one-piece diffusion layer is made in one step. The integrated diffusion layer of the present invention replaces the traditional diffusion layer composed of carbon paper and microporous layer, and when it is applied to the cathode of a direct methanol fuel cell or as the cathode and anode diffusion layer at the same time, the maximum power density of a single cell is compared with that of a commercial diffusion layer. Improvements of 20% and 35%, respectively. The integrated diffusion layer of the present invention is applied to the oxygen electrode of zinc-air battery, and the maximum power density is as high as 200mA cm ‑2 , which also provides a potential direction for the exploration of new diffusion layer processes and materials with high performance and low cost for fuel cells.

Description

technical field [0001] The invention relates to a gas diffusion layer of a fuel cell, in particular to an integrated diffusion layer and a preparation method and application thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC), direct methanol fuel cell (DMFC) and metal-air battery have become popular in recent years due to their high power density, high energy conversion efficiency, low temperature start-up, pollution-free, and lightweight. Research hotspots [1-3] . The membrane electrode (MEA), the core component of a fuel cell, is usually prepared by a hot pressing process from a gas diffusion layer, a catalytic layer and a proton exchange membrane. The gas diffusion layer is located between the catalytic layer and the flow field plate, and is generally composed of a supporting layer (Backing Layer, BL) and a microporous layer (Microporous Layer, MPL). [4] . The support layer mainly plays the role of supporting the microporous layer and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/10H01M8/1011H01M12/06
CPCH01M4/8807H01M4/8605H01M8/10H01M8/1011H01M12/06Y02E60/50
Inventor 赵红舒清柱王素力魏伟
Owner DALIAN JIAOTONG UNIVERSITY
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