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A hollow fiber pore-forming agent and its application in fuel cells

A fuel cell and hollow fiber technology, applied in the direction of battery electrodes, fiber chemical characteristics, hollow filament manufacturing, etc., to achieve the effects of improving connection, reducing activation polarization, enhancing processability and flexibility

Active Publication Date: 2021-11-09
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dr. Pan Weiping from Harbin Institute of Technology used electrospinning technology in his thesis "Study on the Influence of Anode Pores and Interface Microstructure on Electrode Polarization and Performance of SOFC", and introduced NiO-containing anode initial powder in the fiber collection process to obtain a more ideal Compared with the existing fuel cell anode, the microstructure of the fuel cell anode has made significant progress, but there is still a large room for excavation for the potential of the fuel cell anode

Method used

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  • A hollow fiber pore-forming agent and its application in fuel cells
  • A hollow fiber pore-forming agent and its application in fuel cells
  • A hollow fiber pore-forming agent and its application in fuel cells

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1 (best example): the preparation method of fuel cell anode of the present invention:

[0035] S1. Preparation of fuel anode primary powder: Pre-fire the nickel-containing metal oxide powder at 600°C for 2 hours, then mix and grind it with 8% mol YSZ electrolyte powder for 2 hours to obtain the anode primary powder, in which the nickel-containing metal is oxidized The mass ratio of material and YSZ is 1:1; the nickel-containing metal oxide is NiO or Ni 2 o 3 one or a mixture of both;

[0036] S2, preparation of PAN-PVP coaxial hollow fiber:

[0037] Dissolve 1gPAN and 1gPVP in 20ml dimethylformamide, stir at 45°C for 12h, and the stirring speed is 90rmin -1 Form a uniform PAN-PVP mixed solution;

[0038] Operated on a high-voltage electrospinning machine, a coaxial spinneret is made with a common medical syringe. The diameter of the inner pinhole is 0.7mm, and the diameter of the outer pinhole is 1.6mm. The inner pinhole is placed with methyl silicone oil...

Embodiment 2-10

[0041] Embodiment 2-10: the preparation method of the fuel cell anode of the present invention:

[0042] S1, prepare anode initial powder: same as embodiment 1;

[0043] S2. Preparation of PAN-PVP coaxial hollow fiber: the steps are the same as in Example 1, and the specific experimental parameters are designed as shown in Table 1;

[0044] S3, anode initial powder and PAN-PVP coaxial hollow fiber: same as embodiment 1;

[0045] S4, preparing fuel cell anode: same as Example 1;

[0046] The preparation process parameter contrast of each embodiment of table 1

[0047]

[0048]

Embodiment 11

[0049] Embodiment 11 electrochemical performance test

[0050] The fuel cell anodes prepared in the above examples are used to prepare fuel cell anodes coated with a solid electrolyte on one side. The method is as follows: first prepare the electrolyte slurry, and then use the slurry spin coating method to place a drop of the electrolyte slurry on the In the center of the outer surface of the anode side of the above-mentioned fuel cell, the speed of the homogenizer is 6000r min -1 , the running time is set to 60s, and the centrifugal force generated by the high-speed rotation of the fuel electrode driven by the glue homogenizer makes the electrolyte slurry evenly coated on the outer surface of the fuel cell anode side, and then the fuel cell anode with a layer of electrolyte slurry attached is placed at 400 After drying, spin-coat the second layer and the third layer on the formed first layer of electrolyte film. Each layer must be dried at 400°C. Finally, there will be a tota...

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Abstract

The invention relates to a hollow fiber pore-forming agent and its application in fuel cells. The pore-forming agent is PAN-PVP coaxial hollow fiber, and its preparation method is to combine polyacrylonitrile, polyvinylpyrrolidone Prepare a PAN-PVP mixed solution, and then operate it on a coaxial high-voltage electrospinning machine, place methyl silicone oil in the inner pinhole, place a PAN-PVP mixed solution in the outer pinhole, and rotate the drum collector to collect the PAN-PVP coaxial hollow fiber. The PAN-PVP hollow fiber of the present invention can form a three-dimensional network cross-linked cavity after the anode of the fuel cell is fired to remove the fiber, which helps to improve the connection of the anode inside the hole, increases the internal specific surface area of ​​the electrolyte, and reduces the battery overall. Activate the polarization, increase the electrochemical reaction area, reduce the internal resistance of the battery, and accelerate the diffusion of substances, thereby ultimately improving the output performance of the battery and slowing down the decline in specific capacity.

Description

technical field [0001] The invention relates to the battery field, in particular to a hollow fiber pore-forming agent and its application in fuel cells. [0002] technical background [0003] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy, also known as an electrochemical generator. It is the fourth power generation technology after hydropower, thermal power and atomic power. Since the fuel cell converts the Gibbs free energy in the chemical energy of the fuel into electrical energy through an electrochemical reaction, it is not limited by the Carnot cycle effect, so the efficiency is high; in addition, the fuel cell uses fuel and oxygen as raw materials; at the same time There are no mechanical transmission parts, so there is no noise pollution, and the emission of harmful gases is very small. It can be seen that from the point of view of saving energy and protecting the ecological environment, fuel cells are the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/56D01F1/10D01F1/08H01M4/86H01M4/88
CPCD01F1/08D01F1/10D01F6/56H01M4/8605H01M4/88H01M4/8875H01M4/8885Y02E60/50
Inventor 赵金保李雪曾静
Owner XIAMEN UNIV
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