Preparation method of carbon paper for gas diffusion layer of high-carbon-content fuel cell

A gas diffusion layer and fuel cell technology, applied in fuel cells, electrical components, battery electrodes, etc., can solve the problems of poor structural compactness of carbon fiber paper and difficult industrial production, and achieve stable chemical properties, increased carbon content, and high gas diffusion. sexual effect

Active Publication Date: 2020-11-06
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First, carbon fiber is graphitized, and then carbon paper prefabricated parts are prepared by dry papermaking method. After the papermaking is completed, carbonization treatment is carried out, and chemical vapor deposition is carried out. The process is simpler and the cost is lower, but the inventors found that the carbon fiber paper prepared by this method has poor structural compactness and is difficult to realize industrial production

Method used

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  • Preparation method of carbon paper for gas diffusion layer of high-carbon-content fuel cell
  • Preparation method of carbon paper for gas diffusion layer of high-carbon-content fuel cell

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Embodiment approach

[0025] A typical embodiment of the present invention provides a method for preparing carbon paper for a gas diffusion layer of a high-carbon fuel cell, the steps of which include:

[0026] Immerse the carbon fiber paper in the first conductive ink, first ultrasonically treat it, then impregnate it under negative pressure, and then dry it, so that the solute in the first conductive ink is combined with the carbon fiber paper to obtain a carbon paper precursor A; carbonize the carbon paper precursor A to obtain Carbon paper precursor B;

[0027] The carbon paper precursor B and the second conductive ink are impregnated-cured-carbonized to obtain the carbon paper precursor C, and the carbon paper precursor C and the third conductive ink are repeatedly impregnated-cured-carbonized to obtain the carbon paper precursor D;

[0028] Graphitizing the carbon paper precursor D to obtain carbon paper;

[0029] Wherein, the preparation process of the first conductive ink, the second cond...

Embodiment 1

[0054] A preparation method of carbon paper for a fuel cell gas diffusion layer with high carbon content, comprising the following steps:

[0055] (1) Mix fibrils and conductive particles: pretreat carbon nanotubes with a length of 10-20 μm and a diameter of 1-100 nm in 0.1 wt % hydrochloric acid solution, stir at a speed of 600 r / min for 5 min, and pretreat After completion, wash with deionized water and dry, according to 1wt% of the absolute dry mass of phenolic resin ethanol solution, add in 50wt% phenolic resin ethanol solution, stir 5min after adding; Add 10 wt% of ethanol solution into ethanol solution of phenolic resin and stir for 1 hour. Under the condition of ultrasonic frequency of 400-500KHz, perform ultrasonic treatment for 5 minutes to prepare uniform conductive ink A.

[0056] (2) Slowly immerse the carbon fiber paper in conductive ink A, and put the beaker into an ultrasonic disperser. After ultrasonic treatment for 10 minutes, it is immersed in negative pressu...

Embodiment 2

[0063] A preparation method of carbon paper for a fuel cell gas diffusion layer with high carbon content, comprising the following steps:

[0064] (1) Mixing fibrils and conductive particles: Pretreat PAN-based carbon fibers with a length of 3-7 mm and a diameter of 10-20 μm in 0.1 wt % hydrochloric acid solution, stir at a speed of 600 r / min for 5 min, and pretreat Clean and dry with deionized water after completion, then add in the absolute ethanol solution of 50wt% PTFE according to 1wt% of absolute dry mass in the absolute ethanol solution of PTFE, stir 5min after adding; 200-mesh graphite powder is added to the absolute ethanol solution of PTFE according to 10wt% of the absolute dry mass in the absolute ethanol solution of PTFE, stirred for 1 hour, and ultrasonically treated for 5 minutes at an ultrasonic frequency of 400-500KHz to obtain a uniform Conductive ink A.

[0065] (2) Slowly immerse the carbon fiber paper in conductive ink A, and put the beaker into an ultraso...

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Abstract

The invention discloses a preparation method of carbon paper for a gas diffusion layer of a high-carbon-content fuel cell. The method comprises the following steps: immersing carbon fiber paper into first conductive ink, carrying out ultrasonic treatment, carrying out negative pressure impregnation, and drying to compound solute in the first conductive ink with the carbon fiber paper to obtain a carbon paper precursor A; carbonizing the carbon paper precursor A to obtain a carbon paper precursor B; the carbon paper precursor B and the second conductive ink being subjected to dipping-curing-carbonization treatment to obtain a carbon paper precursor C, and the carbon paper precursor C and the third conductive ink being repeatedly subjected to dipping-curing-carbonization treatment once to obtain a carbon paper precursor D; and graphitizing the carbon paper precursor D to obtain the carbon paper. The prepared carbon paper has the mechanical strength and gas diffusion performance of a gasdiffusion layer, is high in porosity, and has the characteristics of stable chemical performance, low resistivity and high conductivity.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for preparing carbon paper for a gas diffusion layer of a fuel cell with high carbon content. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Fuel cell power generation is a power generation device that directly converts chemical energy into electrical energy without combustion. It uses hydrogen, natural gas, methanol and other fuels and pure oxygen or air as raw materials to undergo oxidation-reduction reactions at the cathode and anode of the battery, respectively, and converts chemical energy. It is continuously converted into electrical energy. It is an electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86H01M8/0234H01M8/1004
CPCH01M4/8807H01M4/8605H01M8/0234H01M8/1004Y02E60/50Y02P70/50
Inventor 韩文佳景鑫丁其军赵传山孔凡功姜亦飞李霞
Owner QILU UNIV OF TECH
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