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Gas diffusion layer of fuel cell and preparation method thereof and fuel cell

A gas diffusion layer and fuel cell technology, which is used in fuel cells, fuel cell additives, battery electrodes, etc., can solve the problems of poor hydrophobicity of the diffusion layer, etc., to improve the stability of current operation, easy operation, and improve output performance. Effect

Active Publication Date: 2020-05-22
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is to overcome the defect of poor hydrophobic performance of the fuel cell diffusion layer in the prior art, and to provide a fuel cell gas diffusion layer and its preparation method, fuel cell

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The carbon paper of Example 1 was purchased from Japan Toray’s model TGP-H-060, and the carbon paper of Example 2 was purchased from Japan’s Toray Model TGP-H-030.

[0058] PTFE solution was purchased from Chemours, USA, with a mass fraction of 60%.

[0059] Vulcan-xc72 was purchased from Cabot Cabot in the United States.

[0060] Ethylene glycol was purchased from Sinopharm Chemical Reagent Co., Ltd., analytically pure.

[0061] Tween 80 was purchased from sigma-Aldrich.

[0062] The Pt / C catalyst was purchased from Johnson Matthey, model HiSPEC 9100, 55.5-58.5% Pt.

[0063] The proton exchange membrane was purchased from Chemours, model NC700.

[0064] Effect The type of scanning electron microscope used in the embodiment is Sirion 200 from FEI Company of the United States; the test instrument for contact angle is DSA100 German optical contact angle measuring instrument.

[0065] Example 1

[0066] Preparation of the gas diffusion layer:

[0067] 1. Place carbon...

Embodiment 2

[0071] Except following conditions, other conditions are all identical with embodiment 1:

[0072] 1. The thickness of the carbon base material is 0.11mm, and the model of the carbon base material is TGP-H-030;

[0073] When coating, the temperature of the heating plate is 100°C;

[0074] The dosage of PTFE solution is 0.06mL / cm 2 carbon base material;

[0075] The concentration of PTFE solution is 8%;

[0076] The hydrophobic curing temperature is 280°C; the curing temperature is 90s;

[0077] After curing, the weight of PTFE in the hydrophobic carbon base material is 12.7%;

[0078] 2. In the slurry, the mass ratio of conductive carbon powder, dispersant, hydrophobic binder and emulsifier is 1:12:0.2:0.1;

[0079] The emulsifier is Triton x-100;

[0080] Conductive carbon powder is a mixture of graphite powder and conductive carbon black, the masses are 4g and 12g respectively; the conductive carbon black is EC600J;

[0081] The dispersant is a mixture of 192g of wate...

Embodiment 3

[0088] Except following conditions, other conditions are all identical with embodiment 1:

[0089] 1. The carbon base material is carbon cloth;

[0090] When coating, the temperature of the heating plate is 120°C;

[0091] The dosage of PTFE solution is 0.04mL / cm 2 carbon base material;

[0092] The concentration of PTFE solution is 33%;

[0093] The hydrophobic curing temperature is 365°C; the curing temperature is 60s;

[0094] After curing, the weight of PTFE in the hydrophobic carbon base material is 16%;

[0095] 2. In the slurry, the mass ratio of conductive carbon powder, dispersant, hydrophobic binder and emulsifier is 1:20:4:2;

[0096] The emulsifier is Triton x-100;

[0097] Conductive carbon powder is a mixture of conductive carbon black and carbon nanotubes, with a mass of 16g ​​and 2g respectively;

[0098] The dispersant is a mixture of 360g water and isopropanol, and the mass ratio of water to isopropanol is 2:4;

[0099] The stirring speed is 200rpm, a...

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Abstract

The invention discloses a preparation method of a gas diffusion layer of a fuel cell. The method comprises the following steps of: (1) performing hydrophobic treatment on two sides of a carbon substrate material by using a hydrophobic material, and performing curing to obtain a hydrophobic carbon substrate material; (2) coating slurry on one side of the hydrophobic carbon substrate material, and forming a microporous layer after curing, wherein the slurry comprises conductive carbon powder, a dispersing agent, a hydrophobic binder and an emulsifying agent, the mass ratio of the conductive carbon powder to the dispersing agent to the hydrophobic binder to the emulsifying agent is 1:(10-20):(0.2-4):(0.1-2), and the emulsifying agent comprises one or more of Tween 80, triton x-100 and dipolyglycerol. The gas diffusion layer of the fuel cell is good in hydrophobic property, the contact angle can be 160 degrees or above, the water management condition of the fuel cell can be improved, the discharge voltage, the discharge efficiency and the output performance under high current density of the membrane electrode are improved, and the current operation stability and the long-time operationstability of the fuel cell under high voltage can also be improved.

Description

technical field [0001] The invention relates to a fuel cell gas diffusion layer, a preparation method thereof, and a fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a kind of fuel cell with proton exchange membrane as the conductive medium, mainly composed of bipolar plate (bipolar plate), gas diffusion layer (gas diffusion layer, GDL), catalytic layer (catalyst layer, CL) and proton exchange membrane (proton exchange membrane), in which, the surface of the bipolar plate is processed with a gas channel (gas channel, GC), such as figure 1 shown. [0003] The basic working principle of the proton exchange membrane fuel cell is as follows: on the anode side, hydrogen gas is passed into the gas channel on the bipolar plate, transported through the gas diffusion layer to the catalytic layer, and electrochemically reacts under the action of the catalyst to generate protons and electrons ,which is: [0004] h 2 →2H + +2e - [0005] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86H01M8/0241H01M8/04291H01M8/1004
CPCH01M4/8807H01M4/8657H01M8/1004H01M4/8605H01M8/04291H01M8/0241Y02E60/50
Inventor 李晓琳杨敏季文姣倪蕾蕾朱星烨汪聪敏
Owner SHANGHAI ELECTRICGROUP CORP
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