Carbon nanofiber, diffusion layer, membrane electrode, fuel cell and its preparation method and application

A technology of carbon nanofibers and diffusion layers, applied in fuel cells, battery electrodes, fiber chemical characteristics, etc., can solve the problems of large free path of material diffusion, weak material transport ability, and inactivation of active sites, and achieve high-efficiency preparation, Improve catalytic activity and reduce the effect of free path

Active Publication Date: 2022-06-21
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a carbon nanofiber, diffusion layer, membrane electrode, Fuel cell and its preparation method and application
[0005] The present invention aims at constructing a local high-efficiency proton transport channel and a water molecule conduction channel at the three-phase reaction interface in the catalytic layer, thereby improving the proton, O 2 The reactants are sufficient, and the water flooding phenomenon of the catalytic layer is suppressed, and the problem of active site deactivation is solved, so as to improve the performance of the fuel cell membrane electrode

Method used

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  • Carbon nanofiber, diffusion layer, membrane electrode, fuel cell and its preparation method and application
  • Carbon nanofiber, diffusion layer, membrane electrode, fuel cell and its preparation method and application
  • Carbon nanofiber, diffusion layer, membrane electrode, fuel cell and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0079] 1. Preparation of carbon nanofibers

[0080] S1. First, 2 g of polyacrylonitrile (PAN) powder was weighed and dissolved in 30 g of DMF solution, with a mass fraction of 6.25 wt %. Stir on a magnetic stirrer that can be heated for 3 hours, control the temperature at 60 °C, fully dissolve, and form a PAN spinning precursor solution;

[0081] Transfer the spinning solution to the syringe, fix it on the electrospinning machine, set the spinning environment temperature to 45°C, control the humidity to be below 30% to 35%, the spinning voltage to 19kV, and the spinning solution supply speed to be 0.10mm / min, wrap the cut aluminum foil on the drum, close the protection door of the spinning box, turn on the high-voltage power supply, and carry out double-nozzle electrospinning.

[0082] S2. Remove the receiver, collect the polymer fiber cloth, and place it in a 60°C vacuum oven for drying. The dried polymer fibers were placed in a muffle furnace for pre-oxidation treatment, ...

Embodiment 2

[0089] 1. Preparation of carbon nanofibers

[0090] S1. First, weigh 2 g of polyvinylpyrrolidone (PVP) powder, and dissolve it in 23 g of DMF solution, with a mass fraction of 8 wt %. Stir for 4 hours on a magnetic stirrer that can be heated, and the temperature is controlled at 90 °C, and it is fully dissolved to form a spinning solution with PVP;

[0091] Transfer the spinning solution to the syringe, fix it on the electrospinning machine, set the spinning environment temperature to 45°C, control the humidity to 30% to 60%, the spinning voltage to 17kV, and the spinning solution supply speed to be 0.06mm / min , wrap the cut aluminum foil on the drum, close the protection door of the spinning box, turn on the high-voltage power supply, carry out double-nozzle electrospinning, and adjust the drum collection speed to 80rpm until the spinning solution is consumed.

[0092]S2. Remove the receiver, collect the polymer fiber cloth, and place it in a 60°C vacuum oven for drying.

...

Embodiment 3

[0099] The polyacrylonitrile (PAN) in Example 1 was replaced with a blend of polyacrylonitrile (PAN) and polyethylene oxide (PEO) (mass ratio of 1:1), and other conditions were the same as those in Example 1, to obtain Black solid carbon nanofiber. A diffusion layer was prepared with the prepared carbon nanofibers, and the preparation method was the same as that in Example 1.

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Abstract

The invention discloses a carbon nanofiber, a diffusion layer, a membrane electrode, a fuel cell, a preparation method and an application thereof. The preparation method of the carbon nanofiber comprises the following steps: S1, drying the spinning solution after electrospinning; wherein, the spinning solution includes a polymer and a solvent, and the mass of the polymer in the spinning solution Fraction is 6~10%, described polymer comprises nitrogen-containing polymer, and described nitrogen-containing polymer is one or more in polyacrylonitrile, polyvinylpyrrolidone, polyethylimide and polyaniline; The temperature of the carbonization is 60-80°C; S2, high-temperature carbonization, the temperature of the carbonization is 750-950°C. The diffusion layer prepared by the carbon nanofiber has large pore volume, small material diffusion free path and strong material transmission capacity.

Description

technical field [0001] The invention relates to a carbon nanofiber, a diffusion layer, a membrane electrode, a fuel cell and a preparation method and application thereof. Background technique [0002] Water management plays an important role in proton exchange membrane fuel cells (PEMFCs) because at the PEMFC cathode side, H + and O 2 The reaction takes place to generate water, which diffuses into the diffusion layer through the catalytic layer. If the water generated by the cathode cannot be discharged in time, excess water will accumulate in the diffusion layer, and in severe cases, the catalytic layer will be flooded, covering the active site and increasing activation polarization; Concentration polarization; it will also lead to uneven distribution of the reaction gas in each reaction unit, insufficient gas at the reaction interface, and reduce the overall performance of the battery. [0003] Traditionally, carbon paper is coated with a microporous layer composed of c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/92H01M8/1004D01F9/21D01F9/22D01F9/24
CPCH01M4/8807H01M4/926H01M8/1004D01F9/22D01F9/21D01F9/24Y02E60/50
Inventor 朱星烨杨敏李晓琳汪聪敏季文姣黄腾达
Owner SHANGHAI ELECTRICGROUP CORP
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