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Stable and high-performance proton exchange membrane fuel cell catalyst slurry and preparation method thereof

A proton exchange membrane and catalyst slurry technology, applied in fuel cells, battery electrodes, electrochemical generators, etc., can solve the problems of poor stability of catalyst slurry and poor performance of finished membrane electrodes, and achieve improved performance, slurry stability, The effect of increasing the number of accessible protons

Active Publication Date: 2020-12-25
TONGJI UNIV
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  • Abstract
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Problems solved by technology

[0009] The purpose of the present invention is to provide a stable and high-performance proton exchange membrane fuel cell catalyst slurry and preparation method thereof, which is used to solve the problem of poor performance of the finished membrane electrode due to the aggregation of ionomers in the catalyst slurry, and the catalyst The problem of poor slurry stability

Method used

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  • Stable and high-performance proton exchange membrane fuel cell catalyst slurry and preparation method thereof
  • Stable and high-performance proton exchange membrane fuel cell catalyst slurry and preparation method thereof
  • Stable and high-performance proton exchange membrane fuel cell catalyst slurry and preparation method thereof

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preparation example Construction

[0035] A method for preparing a stable and high-performance proton exchange membrane fuel cell catalyst slurry, comprising the following steps:

[0036] 1) Mixing water and isopropanol in mass ratios (1-9):1 and 1:(1-9) respectively to prepare a first mixed solution and a second mixed solution;

[0037] 2) Mix the first mixed solution with 5-20wt% Nafion solution, and use a high-shear disperser to disperse for 0.5-1h at a shear speed of 10000-15000rpm at 0-20°C to obtain a Nafion mixed solution; , during the dispersion process, it is necessary to seal the Nafion solution, slowly increase the shear speed at the beginning of the dispersion, and slowly decrease the shear speed at the end of the dispersion;

[0038] 3) Mix the second mixed solution with the Pt / C catalyst, and use a high-shear disperser to disperse at a shear speed of 10000-20000rpm at 0-10°C for 0.5-2h to obtain a catalyst slurry; wherein, dispersing During the process, it is necessary to seal the catalyst and th...

Embodiment 1

[0047] A method for preparing a stable and high-performance proton exchange membrane fuel cell catalyst slurry, comprising the following steps:

[0048] 1) Mix 51.12g deionized water and 12.78g isopropanol to obtain the first mixed solution, and mix 12.78g deionized water and 51.12g isopropanol to obtain the second mixed solution;

[0049] 2) Mix the first mixed solution with 7.2g 5wt% Nafion solution, and use a high-shear disperser to disperse for 0.5h at a shear speed of 10000rpm at 10°C to obtain a Nafion mixed solution; wherein, during the dispersion process, It is necessary to seal the Nafion solution, slowly increase the shear speed at the beginning of the dispersion, and slowly decrease the shear speed at the end of the dispersion;

[0050] 3) Mix the second mixed solution with 1 g of Pt / C catalyst (Pt content 60%), and use a high-shear disperser to disperse for 1 h at a shear speed of 15,000 rpm at 5° C. to obtain a catalyst slurry; wherein, During the dispersion proc...

Embodiment 2

[0053] A method for preparing a stable and high-performance proton exchange membrane fuel cell catalyst slurry, comprising the following steps:

[0054] 1) Mix 38.84g deionized water and 25.56g isopropanol to obtain the first mixed solution, and mix 25.56g deionized water and 38.84g isopropanol to obtain the second mixed solution;

[0055] 2) Mix the first mixed solution with 7.2g 5wt% Nafion solution, and use a high-shear disperser to disperse for 0.5h at a shear speed of 10000rpm at 10°C to obtain a Nafion mixed solution; wherein, during the dispersion process, It is necessary to seal the Nafion solution, slowly increase the shear speed at the beginning of the dispersion, and slowly decrease the shear speed at the end of the dispersion;

[0056] 3) Mix the second mixed solution with 1 g of Pt / C catalyst (Pt content 60%), and use a high-shear disperser to disperse for 1 h at a shear speed of 15,000 rpm at 5° C. to obtain a catalyst slurry; wherein, During the dispersion proc...

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Abstract

The invention relates to stable and high-performance proton exchange membrane fuel cell catalyst slurry and a preparation method thereof. The preparation method comprises the steps of: firstly, preparing a first mixed solution and a second mixed solution of water and isopropanol, mixing and dispersing the first mixed solution and a Nafion solution, obtaining a Nafion mixed solution, mixing and dispensing the second mixed solution and a catalyst, and obtaining catalyst slurry; and finally, mixing the Nafion mixed solution with the catalyst slurry, and carrying out ultrasonic dispersion to obtain the proton exchange membrane fuel cell catalyst slurry. Compared with the prior art, the stable and high-performance proton exchange membrane fuel cell catalyst slurry and the preparation method thereof have the advantages that the electrostatic repulsion in the slurry can be increased, so that the slurry is more stable, meanwhile, the ionomer can be more uniformly dispersed on the catalytic layer, the number of reachable protons is increased, and the performance of the fuel cell is improved. In addition, the method is simple to operate and suitable for large-scale preparation of the slurry.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalyst slurry preparation, and relates to a stable and high-performance proton exchange membrane fuel cell catalyst slurry and a preparation method thereof. Background technique [0002] The membrane electrode (MEA) is considered to be the "chip" of the proton exchange membrane fuel cell (PEMFC), and the catalytic layer (CL), as one of the important components of the MEA, is an important place for the electrode reaction, which has a great impact on the performance and durability of the PEMFC Sex matters. However, CL has been facing the problems of slow reaction kinetics of the cathodic oxygen reduction reaction and high mass transport overpotential. An important reason for these problems is the coverage of Pt by ionomers in the catalyst aggregates on CL. Pt will reduce the catalytic active sites resulting in the loss of oxygen reduction reaction activity, while the high density and thick iono...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M8/1004
CPCH01M4/8828H01M4/8825H01M8/1004Y02E60/50
Inventor 李冰明平文张存满郭玉清杨代军丁志强
Owner TONGJI UNIV
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