Preparation method of fuel cell membrane electrode catalyst layer

An electrode catalytic layer, fuel cell membrane technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of increasing the complexity of the membrane electrode preparation process and production cost, which is not conducive to the efficient production of membrane electrodes, etc. Small changes and the effect of reducing mass transfer loss

Active Publication Date: 2020-10-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method also increases the complexity and production cost of the membrane electrode preparation process. At the same time, the processing time for vacuum removal of solvent is as long as several hours, which is not conducive to the efficient production of membrane electrodes.

Method used

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  • Preparation method of fuel cell membrane electrode catalyst layer
  • Preparation method of fuel cell membrane electrode catalyst layer
  • Preparation method of fuel cell membrane electrode catalyst layer

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment provides a kind of preparation method of fuel cell membrane electrode catalytic layer, and makes the catalytic layer / ion exchange membrane module (Catalyst Coated Membrane, CCM) with uniform catalytic layer structure such as figure 2 As shown, the magnetic field control process device diagram of the catalytic layer drying process is shown in figure 1 Shown, the preparation method of CCM specifically comprises the following steps:

[0042] Step 1: get the mass fraction of 20g platinum (Pt) and be the PtCo / C catalyst of 50%, add 22g deionized water, 28g isopropanol and 50g mass fraction and be the Nafion solution of 20%, after magnetic stirring 4 hours, transfer to high pressure homogenization Carry out secondary dispersion in the homogenizer, the valve pressure of the high-pressure homogenizer is 300-500bar, the nozzle pressure is 400-600bar, disperse for 1 hour, and obtain the catalytic layer slurry; wherein, the atomic ratio of Pt and Co in the PtCo / C ...

Embodiment 2

[0048] The present embodiment provides a kind of preparation method of fuel cell membrane electrode catalytic layer, and makes the catalytic layer / ion exchange membrane assembly (CCM) that has three-layer structure cathode catalytic layer such as image 3 As shown, the CCM specifically includes the following steps:

[0049] Step 1: get 20g platinum (Pt) mass fraction and be 50% PtCo / C catalyst, add 200g deionized water and 350g isopropanol, add 200g mass fraction after ultrasonic dispersion 5 minutes and be 5% Nafion solution, ultrasonic dispersion 20 minutes, then stirred for 1 hour to prepare catalyst slurry; wherein, the atomic ratio of Pt and Co in the PtCo / C catalyst was 3:1;

[0050] Step 2: Use an ultrasonic sprayer to spray the cathode catalytic layer: set the temperature of the bottom plate of the sprayer to 60°C, set the slurry flow rate and travel speed of the nozzle so that the single-layer Pt loading is 0.1mg / cm 2 ;An electromagnet is placed behind the nozzle thr...

Embodiment 3

[0056] This embodiment provides a method for preparing a catalytic layer of a fuel cell membrane electrode, which specifically includes the following steps:

[0057] Step 1: Take 15g of Pt / C catalyst with a mass fraction of platinum of 50%, 5g of PtCo / C catalyst with a mass fraction of platinum of 50%, add 200g of deionized water and 350g of isopropanol, and add after ultrasonic dispersion for 5 minutes 200g of Nafion solution with a mass fraction of 5%, ultrasonically dispersed for 20 minutes, and then stirred for 1 hour to prepare a catalyst slurry; wherein, the atomic ratio of Pt to Co in the PtCo / C catalyst was 3:1;

[0058] Step 2: Use an ultrasonic sprayer to spray the catalyst slurry on both sides of the Gore-select proton exchange membrane 602, set the temperature of the bottom plate heated by the sprayer to 60°C, and control the Pt loading by setting the slurry flow rate and travel speed of the sprayer. CCM was obtained after drying, wherein the Pt loading of the cath...

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Abstract

The invention provides a preparation method of a fuel cell membrane electrode catalyst layer. The fuel cell membrane electrode catalyst layer comprises a cathode catalyst layer and an anode catalyst layer which are prepared on two sides of the substrate; both the cathode catalyst layer and the anode catalyst layer are formed by coating catalyst layer slurry on the surface of a substrate and performing drying and catalytic layer post-treatment, the catalyst layer slurry of the cathode catalyst layer comprises a catalyst containing ferromagnetic elements, a magnetic field is applied in the post-treatment process of the catalyst layer of the cathode catalyst layer, so that the catalyst containing ferromagnetic elements moves in the cathode catalyst layer, the in-situ regulation and control ofthe pore structure of the cathode catalyst layer are realized, the porosity of the catalyst layer is improved, and the mass transfer of reaction gas in the catalyst layer is promoted; moreover, the magnetic field adjusting process has many controllable parameters, the process is simple, the pollution of the catalyst layer is avoided, the magnetic field adjusting process can be realized by only additionally configuring one magnetic field adjusting device on the existing production line in commercial application, the existing process system is slightly changed, and the popularization is easy.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cells, and in particular relates to a method for preparing a catalytic layer of a fuel cell membrane electrode. Background technique [0002] Proton Exchange Membrane Fuel Cells (PEMFC) have outstanding advantages such as low operating temperature, high power density, fast start-up speed, and zero emissions. The application prospect is an important direction for the sustainable development of energy in the future. [0003] In the PEMFC cell stack, the membrane electrode (Membrane Electrode Assembly, MEA) is the core component of the system for external energy output, consisting of a proton exchange membrane, a catalytic layer (Catalyst Layer, CL) coated on both sides of the proton exchange membrane surface gas diffusion layer. Among them, the catalytic layer is the place where the electrochemical reaction of the fuel cell occurs, and is composed of an ionic polymer, a catalyst and a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/8828H01M4/8878H01M4/8882H01M4/921H01M4/926Y02E60/50
Inventor 高艳汤浩乔泽敏殷聪李凯
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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