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Catalyst and preparation method thereof

A catalyst and carbonized layer technology, applied in the field of fuel cell catalyst preparation, can solve problems such as the decrease of the electrochemical performance of the catalyst

Active Publication Date: 2021-06-18
江苏擎动新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The inventor found that the general platinum carbon catalyst, in the patents and literature reports that have been published so far, the publication number: CN111092235A The initial performance of the catalyst prepared by the microwave method is better, but when the catalyst aging performance test is carried out, the catalyst will not be used for a long time. The problem of electrochemical performance degradation is prone to occur during use

Method used

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  • Catalyst and preparation method thereof

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preparation example Construction

[0029] figure 1 The preparation flowchart of the catalyst provided by this application. see figure 1 , the application provides a method for preparing a catalyst, comprising the steps of:

[0030] S10, preparation of catalyst precursor

[0031] The catalyst precursor includes a carrier and nanometer metal particles loaded on the carrier. It can be prepared by microwave method with publication number CN111092235A. Of course, it can also be prepared by other methods, such as hydrogen high-temperature reduction method, etc., which are not limited in this application.

[0032] Optionally, the mass ratio of the nano-metal particles to the carrier is 2:8-7:3, as an example, the mass ratio of the nano-metal particles to the carrier is 2:8, 2:7, 2:6, 2:5 , 2:4, 2:3, 3:3, 4:3, 5:3, 6:3, or 7:3.

[0033] In the present application, the nano metal particles are platinum nanoparticles. In other embodiments, the nano metal particles may also be platinum alloy nanoparticles, iridium ...

Embodiment 1

[0056] A method for preparing a catalyst, comprising the steps of:

[0057] (1) Disperse the carbon carrier in ethylene glycol, add chloroplatinic acid, ultrasonically disperse for 120 minutes, and obtain the first suspension after mechanical rotation and stirring. The first suspension was mechanically stirred at room temperature, and the pH value was adjusted to 11 with sodium hydroxide to obtain the second suspension. The second suspension was irradiated with 2000w microwave for 500s, washed with deionized water, and vacuum-dried at 80°C to obtain a platinum-carbon catalyst. The mass ratio of platinum to carbon in the platinum-carbon catalyst is 1:1.

[0058] (2) 0.02 g of pyrrole monomer was dissolved in 100 mL of ethanol, and stirred evenly to obtain a pyrrole monomer solution. Disperse 2 g of the platinum-carbon catalyst in 200 mL of ethanol under nitrogen protection to obtain a platinum-carbon catalyst dispersion. Under nitrogen protection, the pyrrole monomer solutio...

Embodiment 2

[0063] A method for preparing a catalyst, comprising the steps of:

[0064] (1) Disperse the carbon carrier in ethylene glycol, add chloroplatinic acid, ultrasonically disperse for 120 minutes, and obtain the first suspension after mechanical rotation and stirring. The first suspension was mechanically stirred at room temperature, and the pH value was adjusted to 11 with sodium hydroxide to obtain the second suspension. The second suspension was irradiated with 2000w microwave for 500s, washed with deionized water, and vacuum-dried at 80°C to obtain a platinum-carbon catalyst. The mass ratio of platinum to carbon in the platinum-carbon catalyst is 1:1.

[0065] (2) 1 g of pyrrole monomer was dissolved in 4.8 L of ethanol, and stirred evenly to obtain a pyrrole monomer solution. Disperse 100 g of the platinum-carbon catalyst in 9 L of ethanol under nitrogen protection to obtain a platinum-carbon catalyst dispersion. Under nitrogen protection, the pyrrole monomer solution and...

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Abstract

The invention provides a catalyst and a preparation method thereof, and belongs to the technical field of fuel cell catalyst preparation. The preparation method of the catalyst comprises the following steps: carrying out high-temperature heat treatment on a catalyst precursor covered with an organic polymer layer to make an organic polymer cracked and carbonized to form a carbonized layer, wherein the catalyst precursor comprises a carrier and nano metal particles loaded on the carrier; and performing acid treatment on the catalyst precursor with the carbonized layer formed on the surface in an oxidizing acid solution to remove the carbonized layer. The catalyst is higher in activity and longer in service life.

Description

technical field [0001] The present application relates to the technical field of preparation of fuel cell catalysts, in particular to a catalyst and a preparation method thereof. Background technique [0002] As a secondary energy source, hydrogen energy has the advantages of wide sources, high mass energy density, and environmental friendliness, and is considered to be an ideal new energy source. Hydrogen fuel cells can use hydrogen to directly convert chemical energy into electrical energy. They have the characteristics of high power density and fast start-up. They have outstanding advantages in the fields of automobiles, fixed power stations, and portable power supplies. [0003] At present, the cathode catalyst in the fuel cell membrane electrode is mainly platinum carbon catalyst. Among them, platinum-carbon catalysts are mostly prepared by wet methods such as liquid phase method and microwave method. Contents of the invention [0004] The inventor found that the ge...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/92
CPCH01M4/926H01M4/8605Y02E60/50
Inventor 黄玉平范书琼周有明王秀米诗阳周佳张晓华吴丹朱威
Owner 江苏擎动新能源科技有限公司
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