Membrane electrode for fuel cell and preparation method thereof

A fuel cell and membrane electrode technology, which is applied to fuel cell components, fuel cells, battery electrodes, etc., can solve the problems of decreased battery performance, insufficient dispersion, and long operating time, so as to shorten the dispersion time and improve the utilization rate. And, the effect of improving the dispersion efficiency

Inactive Publication Date: 2014-01-15
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different membrane electrode preparation methods have different requirements on the composition of the slurry. For the transfer method that can be mass-produced industrially, the transfer rate of the slurry is a very important consideration. The reduction of porosity affects the drainage function of the cathode, which directly leads to the degradation of the performance of the battery, which needs to be improved from the composition of the catalyst slurry
Most of the currently known slurry dispersion methods are a combination of ultrasonic and magnetic stirring. These two methods are not only insufficient in dispersion, but also require a long

Method used

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  • Membrane electrode for fuel cell and preparation method thereof
  • Membrane electrode for fuel cell and preparation method thereof
  • Membrane electrode for fuel cell and preparation method thereof

Examples

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Embodiment 1

[0030] Take 1g of Pt / C catalyst (Pt mass fraction is 40%), add deionized water, isopropanol, perfluorosulfonic acid resin solution, 2g, 3g, 8.5g, 3g of ethylene glycol in sequence, and disperse at 3000rpm 10min. Dissolve 0.5g of ammonium bicarbonate in 2g of water, stir with a magnetic stirrer for 20min until the ammonium bicarbonate is completely dissolved, then add all the solution into the above slurry and disperse at 8000rpm for 0.5h, and finally disperse at a low speed of 3000rpm for 20min until the slurry Air bubbles in the material are completely removed to obtain a slurry of the present invention.

Embodiment 2

[0032] Take 1g of Pt / C catalyst (Pt mass fraction is 40%), add deionized water, isopropanol, perfluorosulfonic acid resin solution, glycerol, simethicone oil 4g, 3g, 8.5g, 3g, 0.05g, the resulting mixture was dispersed at 8000rpm for 0.5h, and finally at a low speed of 3000rpm for 20min until the air bubbles in the slurry were completely removed to obtain a slurry of the present invention.

Embodiment 3

[0034] Take 1g of Pt / C catalyst (Pt mass fraction is 40%), add deionized water, isopropanol, perfluorosulfonic acid resin solution, ethylene glycol, simethicone oil 4g, 3g, 8.5g, 3g, 0.05g, the resulting mixture was dispersed at 8000rpm for 0.5h, 1h, 2h, 4h and 6h to prepare five kinds of slurries with different degrees of dispersion (these five kinds of slurries are respectively marked as T-0.5, T -1, T-2, T-4 and T-6), and finally disperse at a low speed of 3000rpm for 20min until the air bubbles in the slurry are completely removed. Take an appropriate amount of the dispersed slurry and drop it on a glass slide for 24 hours to dry for morphology analysis.figure 1 SEM images of catalyst particles at different dispersion times. It can be seen from the figure that within 4 hours, the dispersion effect of the particles improves with the increase of the dispersion time. When the dispersion time increases to 6 hours, the dispersion state of the particles does not change much.

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Abstract

The invention discloses a membrane electrode for a fuel cell, and a preparation method and a packaging method thereof. A catalysis layer of the membrane electrode provided by the invention is composed of a catalyst slurry on a proton exchange membrane. The catalyst slurry comprises a catalyst, a binder, a disperse solvent, a thickening agent and an additive, and the catalyst is one selected from a Pt catalyst or a Pt alloy catalyst. The preparation method of the membrane electrode provided by the invention comprises the steps of preparation of the catalyst slurry for the membrane electrode, coating of the catalyst slurry and assembly of the membrane electrode. The preparation method of the catalyst slurry provided by the invention can shorten disperse time of the slurry and increase disperse efficiency, and the obtained catalyst slurry can realize transfer rate of 100% in a membrane electrode subassembly preparation process by a transfer printing method, so as to substantially increase utilization rate of the catalyst and electrochemical performance of the membrane electrode and effectively reduce the production cost of the fuel cell.

Description

technical field [0001] The invention relates to the field of fuel cells. Specifically, the present invention relates to a membrane electrode for a fuel cell and its preparation method, especially the composition of the catalyst slurry used in the membrane electrode, the preparation method of the membrane electrode and the sealing method of the membrane electrode. Background technique [0002] Membrane electrode assembly is the core component of proton exchange membrane fuel cell (PEMFC) and direct methanol fuel cell (DMFC), which determines the electrochemical performance of the battery to a large extent. Therefore, the preparation and sealing of membrane electrodes are particularly important to improve the performance of fuel cells. [0003] As we all know, the microstructure of the catalytic layer in the membrane electrode is determined by the slurry coated on the proton exchange membrane, and the composition and degree of dispersion of the slurry have a great influence o...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/02
CPCH01M4/8828H01M4/8875H01M4/921H01M4/926H01M8/1009Y02E60/50Y02P70/50
Inventor 潘国顺梁晓璐徐莉汪嘉澍郭丹
Owner TSINGHUA UNIV
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