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High-solid-content high-dispersity proton exchange membrane fuel cell catalyst ink and preparation method thereof

A proton exchange membrane, catalyst ink technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high viscosity catalyst ink with high solid content, poor catalyst dispersion effect, etc., to facilitate preparation, improve dispersion effect, and facilitate stability. Effect

Pending Publication Date: 2022-04-19
TONGJI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-solid-content, high-dispersion proton exchange membrane fuel cell catalyst ink and a preparation method thereof, so as to overcome defects such as high viscosity of the high-solid-content catalyst ink in the prior art or poor catalyst dispersion effect

Method used

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  • High-solid-content high-dispersity proton exchange membrane fuel cell catalyst ink and preparation method thereof
  • High-solid-content high-dispersity proton exchange membrane fuel cell catalyst ink and preparation method thereof

Examples

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Embodiment 1

[0037] This embodiment provides a catalyst ink for a proton exchange membrane fuel cell with high solid content and high dispersion. The catalyst ink is composed of a solute and a solvent, and the mass ratio of the solute is 15%. The solute is a Pt / C catalyst, the first The ionomer and the second ionomer, the ratio of the total mass of the first ionomer and the second ionomer to the mass of activated carbon in the Pt / C catalyst is 1:1, and the mass ratio of the first ionomer to activated carbon was 0.5 (I / C=0.5). The solvent in the catalyst ink is a mixture of water, ethanol and n-propanol, and water accounts for 50% of the total mass of the solvent.

[0038] The preparation process of the catalyst ink is as follows:

[0039] 1) After the catalyst was wetted with water, the first ionomer solution (D79) was added, and pre-dispersed by stirring at a low speed with a rotation speed of 3000 rpm and a dispersion time of 2 hours to obtain a pre-dispersed ink.

[0040] 2) Use a hom...

Embodiment 2

[0044] Compared with Example 1, most of them are the same, except that in this embodiment, the mass ratio of the first ionomer and activated carbon is 0.5 (I / C=0.5) into the mass of the first ionomer and activated carbon The ratio was 0.3 (I / C=0.3).

Embodiment 3

[0046]Compared with Example 1, most of them are the same, except that in this example, the mass proportion of the solute in the catalyst ink is changed to 10%.

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Abstract

The invention relates to high-solid-content high-dispersity proton exchange membrane fuel cell catalyst ink and a preparation method thereof.The catalyst ink is prepared through the following steps that S1, a catalyst is taken and added into water, then a first ionomer solution is added, and pre-dispersed ink is obtained through primary stirring; s2, homogenizing and dispersing the pre-dispersed ink to obtain preliminarily dispersed ink; s3, sequentially adding a second ionomer solution and a solvent into the preliminarily dispersed ink, and then stirring for the second time to obtain a target product. The catalyst ink is dispersed by using the first ionomer, and the first ionomer has hydrophilicity and hydrophobicity and can be adsorbed to the surface of a catalyst aggregate in the catalyst ink, so that the surface of the aggregate has potential, the aggregate is dispersed, free water in the aggregate is released, and the viscosity of the catalyst ink is reduced. Compared with the prior art, the catalyst provided by the invention has the advantages of better ink fluidity, higher stability, stronger bonding effect and better catalyst dispersion effect.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalyst slurry preparation, and relates to a high-solid-content, high-dispersion proton exchange membrane fuel cell catalyst ink and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC), as an energy conversion device, directly converts chemical energy into electrical energy, avoids energy loss in the Carnot cycle, and also has the advantages of being green, environmentally friendly, zero-emission, and sustainable, and has become a solution to the energy crisis and key to environmental issues. Membrane electrode (MEA) is a key component of PEMFC. Oxygen reduction reaction (ORR) and hydrogen oxidation reaction (HOR) occur on the cathode and anode, which determine the performance of the cell. The preparation method of the catalytic layer has an important influence on the microstructure of the catalytic layer. A reasonable structure can enable the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/921H01M4/926H01M4/8825
Inventor 李冰明平文杨代军张存满
Owner TONGJI UNIV
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