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Preparation method of high-permeability carbon paper for fuel cell

A fuel cell and air permeability technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as low surface tension, increased hydrophilicity of carbon materials, and damage to water-air balance, and achieve surface resistance and contact resistance. Enhanced conductivity and hydrophobicity, enhanced storage and release effects

Pending Publication Date: 2022-04-15
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, under actual working conditions (such as frequent switching, starting and stopping), the PTFE loaded on the gas diffusion layer has a small surface tension and is easy to gather into agglomerates during heat treatment, so it is difficult to cover the carbon paper evenly. The poor adhesion and weak binding force of the substrate make it easy to fall off with the progress of the reaction, exposing more carbon materials, and at the same time cause the pore structure of the gas diffusion layer to be corroded and enlarged, the hydrophilicity of the carbon materials increases, and the water-gas balance is affected. Destruction, increased water vapor mass transfer resistance, shortened fuel cell life

Method used

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  • Preparation method of high-permeability carbon paper for fuel cell
  • Preparation method of high-permeability carbon paper for fuel cell

Examples

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Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of highly air-permeable carbon paper for fuel cells, comprising the following steps:

[0022] S1: Soak 2cm×2cm blank carbon paper in PTFE solution, repeat the above steps to prepare carbon paper with 15% PTFE content;

[0023] S2: Ce(NO 3 ) 3 .6H 2 O, ZrO(NO 3 ) 2 .2H 2 O and Y (NO 3 ) 3 ·6H 2 0 was dissolved in water, and nano-TiN with a diameter of 400-600nm was added, the mass fraction added was 5%, after continuous stirring, ammonia water was slowly added to the solution, and after adjusting the pH=10-11, obvious deposits were formed. After suction filtration, washing and drying, the precipitate is calcined in a muffle furnace at 550° C. for 2.5 hours, and then the calcined precipitate is pulverized by a planetary ball mill. The particle size of the precipitate is 0.3-0.6 μm.

[0024] S3: Ce prepared from S2 0.6 Y 0.1 Zr 0.3 o 2 / TiN and carbon powder, PTFE emulsion, according to 0.1mg / cm 2 、1mg / cm 2 and 10% of the added amount ar...

Embodiment 2

[0026] A preparation method of highly air-permeable carbon paper for fuel cells, comprising the following steps:

[0027] S1: Soak 2cm×2cm blank carbon paper in PTFE solution, repeat the above steps to prepare carbon paper with 5% PTFE content;

[0028] S2: Ce(NO 3 ) 3 .6H 2 O, ZrO(NO 3 ) 2 .2H 2 O and Y (NO 3 ) 3 ·6H 2 0 was dissolved in water, and nano-TiN with a diameter of 400-600nm was added, and the mass fraction added was 4%. After continuous stirring, ammonia water was slowly added to the solution, and after the pH was adjusted to 10-11, obvious deposits were formed. After suction filtration, washing and drying, the precipitate is calcined in a muffle furnace at 510°C for 3 hours, and then the calcined precipitate is pulverized by a planetary ball mill. The particle size of the precipitate is about 0.3-0.6 μm.

[0029] S3: Ce prepared from S2 0.2 Y 0.05 Zr 0.1 o 2 / TiN and carbon powder, PTFE emulsion, according to 0.15mg / cm 2 , 1.5mg / cm 2 and 12% of the ...

Embodiment 3

[0031] A preparation method of highly air-permeable carbon paper for fuel cells, comprising the following steps:

[0032] S1: Soak 2cm×2cm blank carbon paper in PTFE solution, repeat the above steps to prepare carbon paper with 5-15% PTFE content;

[0033] S2: Ce(NO 3 ) 3 .6H 2 O, ZrO(NO 3 ) 2 .2H 2 O and Y (NO 3 ) 3 ·6H 2 0 was dissolved in water, and nano-TiN with a diameter of 400-600nm was added, and the mass fraction added was 10%. After continuous stirring, ammonia water was slowly added to the solution, and after adjusting the pH=10-11, obvious deposits were formed. After suction filtration, washing and drying, the precipitate is calcined in a muffle furnace at 500-550°C for 2-3 hours, and then the calcined precipitate is pulverized by a planetary ball mill. The particle size of the precipitate is about 0.3-0.6 μm.

[0034] S3: Ce prepared from S2 0.8 Y 0.5 Zr 0.8 o 2 / TIN and carbon powder, PTFE emulsion, according to 0.05mg / cm 2 , 0.5mg / cm 2 and 7% of t...

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Abstract

The invention discloses a preparation method of high-permeability carbon paper for a fuel cell, which comprises the following steps: S1, soaking blank carbon paper in a PTFE solution, and repeating the soaking step to prepare PTFE-containing carbon paper; s2, preparing 0.2 to 0.8 percent of Ce, 0.05 to 0.5 percent of Y, 0.1 to 0.8 percent of Zr and O2 / TiN by a co-deposition method; s3, putting 0.2-0.8 parts of Ce, 0.05-0.5 parts of Y, 0.1-0.8 parts of Zr, O2 / TiN prepared in the S2, carbon powder and PTFE emulsion into ethanol, performing ultrasonic dispersion uniformly, and spraying the mixture onto the surface of the carbon paper prepared in the S1 to form a microporous layer on the surface of the carbon paper, so as to obtain the high-permeability carbon paper. The prepared high-permeability carbon paper for the fuel cell is beneficial to oxygen permeation, the oxygen permeation rate is improved, meanwhile, the conductivity and hydrophobicity of the carbon paper are enhanced, and the surface resistance and the contact resistance of the carbon paper are obviously reduced.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a method for preparing high air permeability carbon paper for fuel cells. Background technique [0002] The gas diffusion layer is located between the bipolar plate and the membrane electrode catalytic layer, and it needs to have multiple properties at the same time, and it needs to have good electrical conductivity, certain mechanical strength, stability and hydrophobicity. Generally speaking, there are hydrophobic reactive gas channels and hydrophilic liquid water transport channels inside the gas diffusion layer. The commonly used gas diffusion layer is composed of a base layer, a hydrophobic layer, and a microporous layer. As one of the key materials of PEMFCs, the gas diffusion layer improves its own conductivity and reduces the contact resistance with other components, which is conducive to promoting the rapid transfer of electrons. , efficient operation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
Inventor 王舒楠欧阳春高平平高美连
Owner JIANGSU UNIV OF SCI & TECH
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