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Membrane electrode and preparation method thereof and fuel cell

A membrane electrode and slurry technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of reduced conductivity of proton exchange membranes, reduced fuel cell performance, increased gas transmission resistance, etc., to improve proton conduction pathways and prevent The effect of reducing the conductivity and improving the drainage capacity

Active Publication Date: 2022-07-29
SHANGHAI ELECTRICGROUP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the battery works at a low current density, it needs to be carried out under high humidification conditions, and when it works at a high current condition, a large amount of water is generated by the discharge cathode, which usually causes the cathode to be flooded and leads to an increase in gas transmission resistance, thereby reducing the performance of the fuel cell.
Therefore, there is still a lack of a membrane electrode that can keep the perfluorosulfonic acid polymer at a good hydration level under low current discharge, and can drain water as soon as possible to prevent the cathode from being flooded under high current discharge. case, it also prevents the conductivity of the proton exchange membrane from decreasing

Method used

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  • Membrane electrode and preparation method thereof and fuel cell

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[0045] In a second aspect, the present application provides a method for preparing a membrane electrode in the first aspect of the present application, the preparation method comprising the following steps:

[0046] The anode catalytic layer slurry is coated on the first side of the proton exchange membrane and dried to form the anode catalytic layer on the first side;

[0047] The hydrophilic catalytic layer slurry and the hydrophobic catalytic layer slurry are sequentially coated on the second side of the proton exchange membrane, and the cathode catalytic layer is formed on the second side after drying.

[0048] In an embodiment of the present application, the preparation process of the anode catalyst layer slurry is as follows: the anode catalyst Pt / C, the resin solution and the solvent are mixed, and the anode catalyst layer slurry is obtained after dispersion. The solvent in the embodiments of the present application can be, for example, a mixed solution of water and iso...

Embodiment 1

[0066] A method for preparing a membrane electrode, comprising the following steps:

[0067] Anode catalyst slurry was obtained by mixing 60% Pt / C (Johnson Matthey), 5wt% Nafion solution (Dupon) and an aqueous solution of isopropanol. After fully stirring and dispersing using a Primix disperser, it was sprayed onto a proton exchange membrane NC700 (Chemours ) on one side of the membrane;

[0068] Mix 60% Pt / C (Johnson Matthey), 5wt% Nafion solution (Dupon), hydrophilic carbon nanofibers, and an aqueous solution of isopropanol to obtain a hydrophilic catalyst slurry;

[0069] Mix 60% Pt / C (Johnson Matthey), 5wt% Nafion solution (Dupon), hydrophobic carbon nanofibers, and an aqueous solution of isopropanol to obtain a hydrophobic catalyst slurry;

[0070] After fully stirring and dispersing the hydrophilic catalyst slurry and the hydrophobic catalyst slurry with a Primix disperser, spray the hydrophilic catalyst slurry on the other side of the NC700 (Chemours) membrane first, a...

Embodiment 2

[0073] A method for preparing a membrane electrode, comprising the following steps:

[0074] The anode catalyst slurry was obtained by mixing 60% Pt / C (Johnson Matthey), 5wt% Nafion solution (Dupon) and an aqueous solution of isopropanol. After fully stirring and dispersing with a Primix disperser, it was sprayed onto the NC700 (Chemours) membrane. one side;

[0075] Mix 60% Pt / C (Johnson Matthey), 5wt% Nafion solution (Dupon), hydrophilic carbon nanofibers, and an aqueous solution of isopropanol to obtain a hydrophilic catalyst slurry;

[0076] Mix 60% Pt / C (Johnson Matthey), 5wt% Nafion solution (Dupon), hydrophobic carbon nanofibers, and an aqueous solution of isopropanol to obtain a hydrophobic catalyst slurry;

[0077] The hydrophilic catalyst slurry and the hydrophobic catalyst slurry were fully stirred and dispersed with a Primix disperser respectively, then sprayed onto the other side of the NC700 (Chemours) membrane in turn, and dried to prepare a membrane electrode ...

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Abstract

The present application relates to the field of batteries, and discloses a membrane electrode, a preparation method thereof, and a fuel cell. The membrane electrode comprises a proton exchange membrane, one surface of the proton exchange membrane is provided with an anode catalytic layer, and the other side surface is provided with a cathode catalytic layer; wherein: the cathode catalytic layer includes a hydrophilic catalytic layer and a hydrophobic catalytic layer arranged in layers, The hydrophilic catalytic layer is located between the proton exchange membrane and the hydrophobic catalytic layer, the hydrophilic catalytic layer includes hydrophilic carbon nanofibers, and the hydrophobic catalytic layer includes hydrophobic carbon nanofibers. The membrane electrode of the present application can keep the perfluorosulfonic acid polymer in a good degree of hydration under a small current discharge, and can drain the water as soon as possible to prevent the cathode from flooding under a large current discharge, and at the same time, it can also keep the proton exchange membrane in good conduction. Rate.

Description

technical field [0001] The present application relates to the field of fuel cells, in particular to a membrane electrode and a method for preparing the same, and a fuel cell. Background technique [0002] In recent years, the shortage of fossil fuels and the harmful gas emissions caused by the burning of fossil fuels have attracted worldwide attention. In order to solve the shortage of natural resources and the increasingly serious environmental and social problems, the development of new energy technologies has gradually become the focus of global attention. Among them, proton exchange membrane fuel cell is one of the new generation energy conversion technologies that has attracted much attention because it can avoid the combustion of fossil fuels. Fuel cells use chemical fuels as an energy source, and directly convert the chemical energy of fuels into electrical energy without going through an inefficient and pollution-prone combustion process. It is an efficient and clea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1004H01M4/88
CPCH01M8/1004H01M4/8878H01M4/8882Y02P70/50Y02E60/50
Inventor 汪聪敏陈福平朱星烨李晓琳
Owner SHANGHAI ELECTRICGROUP CORP
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