Catalyst slurry for fuel cell, preparation method thereof and membrane electrode

A catalyst slurry and fuel cell technology, applied in fuel cells, battery electrodes, electrochemical generators, etc., can solve the problem of uneven dispersion of proton-conducting ionomers, achieve membrane electrode performance, avoid agglomeration, and increase battery voltage Effect

Active Publication Date: 2020-11-17
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The application provides a fuel cell catalyst slurry and its preparation method and membrane electrode, which are used to solve the problem of uneven dispersion of proton-conducting ionomers in the existing catalyst slurry

Method used

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  • Catalyst slurry for fuel cell, preparation method thereof and membrane electrode
  • Catalyst slurry for fuel cell, preparation method thereof and membrane electrode

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preparation example Construction

[0026] In a first aspect, the present application provides a method for preparing a fuel cell catalyst slurry, comprising the following steps:

[0027] Step S1) ultrasonically disperse the perfluorosulfonic acid solution at 50-90°C to obtain a perfluorosulfonic acid dispersion;

[0028] Step S2) mixing the perfluorosulfonic acid dispersion, the catalyst and the dispersion in deionized water to obtain the fuel cell catalyst slurry.

[0029] The preparation method of the catalyst slurry provided by this application can reduce the molecular size of the ionomer in the perfluorosulfonic acid solution by ultrasonically dispersing the perfluorosulfonic acid solution at a high temperature, and make the ionomer in the perfluorosulfonic acid solution The substance is fully dispersed to avoid its own agglomeration. Then, after mixing the perfluorosulfonic acid dispersion liquid treated with high-temperature ultrasonic treatment with catalyst, dispersant and deionized water, the ionomer ...

Embodiment 1

[0052] First add 18g of Nafion solution with a mass fraction of 5% to the container, add 50g of deionized water, and ultrasonically disperse at 90°C for 60min with an ultrasonic power of 600W; then add 3g of Pt / C catalyst particles with a Pt content of 60%, 75g of iso Propanol and 25 g of deionized water were dispersed with a Primix disperser at 10° C. for 10 minutes at a line speed of 25.5 m / s to make them evenly mixed to finally prepare a catalyst slurry.

[0053] Select the proton exchange membrane of Chemours model NC700, install it on the fixture, and install the fixture on the spraying equipment, spray the dispersed catalyst slurry on one side of the proton exchange membrane by ultrasonic spraying, and the spraying conditions are specific Yes: The heating temperature of the spraying table is 120-130°C, the linear speed of the nozzle is 100-120mm / s, and the liquid discharge speed is 0.8-1.0mL / min. Attach two pieces of gas diffusion layers to the proton exchange membrane c...

Embodiment 2

[0067] First add 18g of Nafion solution with a mass fraction of 5% to the container, add 50g of deionized water, and ultrasonically disperse at 60°C for 60min with an ultrasonic power of 600W; then add 3g of Pt / C catalyst particles with a Pt content of 60%, 75g of iso Propanol and 25 g of deionized water were dispersed with a Primix disperser at 10° C. for 10 minutes at a line speed of 25.5 m / s to make them evenly mixed to finally prepare a catalyst slurry.

[0068] Select the proton exchange membrane of Chemours model NC700, install it on the fixture, and install the fixture on the spraying equipment, spray the dispersed catalyst slurry on one side of the proton exchange membrane by ultrasonic spraying, and the spraying conditions are specific Yes: The heating temperature of the spraying table is 120-130°C, the linear speed of the nozzle is 100-120mm / s, and the liquid discharge speed is 0.8-1.0mL / min. Attach two pieces of gas diffusion layers to the proton exchange membrane c...

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Abstract

The invention relates to the field of fuel cells, and particularly discloses catalyst slurry for a fuel cell, a preparation method of the catalyst slurry and a membrane electrode. The preparation method of the catalyst slurry for the fuel cell comprises the following steps of S1) carrying out ultrasonic dispersion treatment on a perfluorosulfonic acid solution at 50-90 DEG C to obtain a perfluorosulfonic acid dispersion liquid; and S2) mixing the perfluorosulfonic acid dispersion liquid with a catalyst, a dispersing agent and deionized water, and emulsifying and dispersing to obtain the fuel cell catalyst slurry. By utilizing the preparation method, the problem of uneven dispersion of the proton conduction ionomer in the existing catalyst slurry can be solved, and the preparation method isused for improving the dispersity of the proton conduction ionomer in the catalyst slurry.

Description

technical field [0001] The present application relates to the field of fuel cells, in particular to a fuel cell catalyst slurry, a preparation method thereof, and a membrane electrode. Background technique [0002] A fuel cell is a power generating device that can directly convert chemical energy into electrical energy through an electrochemical reaction. The membrane electrode in the fuel cell is its core component, which is composed of proton exchange membrane, cathode and anode catalyst layer and gas diffusion layer. Usually, the preparation of the catalytic layer is to coat the catalyst slurry containing Pt catalyst, proton-conducting ionomer and dispersant on both sides of the proton exchange membrane, and form the catalytic layer after drying. Therefore, the uniformity of the catalyst slurry has an important impact on the microstructure of the formed catalytic layer, and directly affects the pore structure, porosity, hydrophilicity and hydrophobicity of the prepared m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M8/1004
CPCH01M4/926H01M8/1004Y02E60/50
Inventor 朱星烨杨敏李晓琳汪聪敏季文姣
Owner SHANGHAI ELECTRICGROUP CORP
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