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Gas diffusion layer for fuel cell and preparation method thereof

A gas diffusion layer and fuel cell technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as easy flooding, and achieve the effects of improving consistency, simplifying preparation processes, and reducing costs

Active Publication Date: 2022-01-11
SHANGHAI SHENLI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of gas diffusion layer for fuel cell and its preparation method in order to overcome the defect that the gas diffusion layer in the prior art is prone to flooding

Method used

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  • Gas diffusion layer for fuel cell and preparation method thereof
  • Gas diffusion layer for fuel cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0037] A method for preparing a gas diffusion layer,

[0038] 1) Prepare conductive paint with acetylene black as the conductive material, the total weight of solid matter in the conductive paint is 100%, and the conductive paint includes the following raw materials in parts by weight: conductive material 80, adhesive 30, pore-forming agent 4wt %, the pore-forming agent is a mixture of ammonium chloride, ammonium bicarbonate and ammonium oxalate, and the average particle size of the pore-forming agent is 500 μm; the binder is a mixture of sodium hydroxymethyl cellulose and polyethylene glycol.

[0039] 2) placing the porous carbon material on a base platform that has adsorption and can be continuously transported;

[0040] 3) Coat the above-mentioned conductive paste on the non-adsorption surface of the porous carbon material. The adsorption strength during the coating process is shown in Table 1. The abutment rotates at a constant speed to continuously transport the coated ma...

Embodiment 5

[0046] A method for preparing a gas diffusion layer,

[0047]1) Prepare a conductive coating with acetylene black as a conductive material. The total weight of solid matter in the conductive coating is 100%, and the conductive coating includes the following raw materials in parts by weight: conductive material 60, adhesive 10, pore-forming agent 1wt %; The pore-forming agent is ammonium chloride, the average particle size of the pore-forming agent is 200 μm, and the binder is sodium hydroxymethyl cellulose.

[0048] 2) Place a porous carbon material with a thickness of 100 μm on a base platform that has adsorption and can be continuously transported;

[0049] 3) Coat the above-mentioned conductive paste on the non-adsorption surface of the porous carbon material, and the adsorption strength during the coating process is 30N / cm 2 , the abutment rotates at a constant speed to continuously convey the coated material, and the mass ratio of the conductive paste to the porous carbo...

Embodiment 6

[0052] A method for preparing a gas diffusion layer,

[0053] 1) prepare conductive paint with acetylene black as conductive material, the total weight of solid matter in the conductive paint is 100%, and described conductive paint comprises the raw material of following weight portion content: conductive material 90, bonding agent 40, carbon fiber 20, make The pore-forming agent is 5 wt%, the pore-forming agent is ammonium bicarbonate, and the average particle size of the pore-forming agent is 600 μm; the binding agent is polyethylene glycol.

[0054] 2) Place a porous carbon material with a thickness of 300 μm on a base platform that has adsorption and can be continuously transported;

[0055] 3) Coat the above-mentioned conductive paste on the non-adsorption surface of the porous carbon material, and the adsorption strength during the coating process is 30N / cm 2 , the abutment rotates at a constant speed to continuously convey the coated material, and the mass ratio of the...

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Abstract

The invention relates to a gas diffusion layer for a fuel cell, comprising a microporous layer mainly composed of a conductive material and a mixed base layer sintered from the above conductive material and a porous carbon material, the mixed base layer and the microporous layer The interior contains a pore structure with a pore size of 300-500 μm. The preparation method is: uniformly mix conductive materials, adhesives, carbon fibers and pore-forming agents to obtain the conductive paste; fix the lower surface of the porous carbon material by adsorption. On the base platform, the conductive paste is evenly coated on the upper surface of the porous carbon material; the porous carbon material coated with the conductive paste is sintered to form the microporous layer and the mixed base layer. Compared with the prior art, the invention has the advantages of high material consistency, stable structure, good water transmission performance, simple preparation process and the like.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a gas diffusion layer for a fuel cell and a preparation method thereof. Background technique [0002] Fuel cells can convert the chemical energy of fuel and oxidant into electrical energy, and its energy conversion efficiency is not limited by the theoretical efficiency of the Carnot heat engine cycle. It has the advantages of high efficiency, environmental friendliness, quietness, and high reliability, and has broad development prospects in many fields. . Among them, proton exchange membrane fuel cells have high power density, fast start-up, and fast response to load changes, which have become an important development direction of energy in the field of transportation. The core component of the fuel cell is the membrane electrode material, which is composed of a proton exchange membrane, a catalyst and a gas diffusion layer through a hot pressing process. The reaction gas (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8657H01M4/8673H01M4/8605H01M4/8807Y02E60/50
Inventor 陈广明徐鑫甘全全戴威
Owner SHANGHAI SHENLI TECH CO LTD
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