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A kind of metal nanocluster composite catalyst and its preparation method and application

A technology of metal nanoclusters and composite catalysts, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the problem of small size of metal nanoclusters, high dispersion, Problems such as high metal loading, achieve the effect of small size, high dispersion and high metal loading

Active Publication Date: 2020-10-09
无锡盛鑫氢能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention prepares high-performance metal nanoclusters with high metal loading, small size of metal nanoclusters, high dispersion, high ratio of dominant crystal planes in catalytic oxygen reduction reaction of metal nanoclusters, and large electrochemical active area through controlled assembly of metal nanoclusters Composite fuel cell catalysts provide a new way to solve the aforementioned problems in fuel cell catalysts

Method used

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  • A kind of metal nanocluster composite catalyst and its preparation method and application
  • A kind of metal nanocluster composite catalyst and its preparation method and application
  • A kind of metal nanocluster composite catalyst and its preparation method and application

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Embodiment 1

[0061] Synthesis and catalytic performance of embodiment 1, Pt metal nanocluster composite catalyst (Pt content: 25wt%)

[0062] 1) Add 1g H 2 PtCl 6 ·6H 2 O was dissolved in 50 mL of ethylene glycol, and the resulting solution was mixed with 50 mL of NaOH in ethylene glycol (0.26 mol / L). at N 2 Stir the mixture under the atmosphere and heat the mixture to 160 °C with microwaves to react and then cool to room temperature to obtain a Pt metal nanocluster colloidal solution with a Pt concentration of 3.7 g / L;

[0063] 2) Dissolve 0.1385g of trimethylhexadecylammonium bromide (CTAB) in 10mL of n-propanol, add 59.4mg of conductive carbon black to the above mixture and ultrasonically treat it;

[0064] 3) Mix 10mL of the Pt metal nanocluster colloidal solution prepared in step 1) with the dispersion system prepared in step 2), stir and filter to obtain the solid in the reaction mixture;

[0065] 4) Wash the solid obtained in step 3) with hot water (90° C.), and dry it in a vac...

Embodiment 2

[0080] Synthesis and catalytic performance of embodiment 2, Pt metal nanocluster composite catalyst (Pt content: 37wt%)

[0081] Change the mass of conductive carbon black (EC-600) to 40.1 mg, and synthesize according to the steps and conditions described in Example 1 to obtain a Pt metal nanocluster catalyst.

[0082] ICP-AES test shows that the mass percentage of Pt metal nanoclusters in the prepared nanocomposite catalyst is 37wt%. Elemental analysis showed that the mass percent content of nitrogen in the prepared nanocomposite catalyst was 0.75wt%. The mass percent content of the surfactant CTAB in the catalyst is 11%. X-ray diffraction spectrum obtains that the ratio of the diffraction peak area of ​​Pt (200) crystal plane and (111) crystal plane diffraction peak area in the catalyst is 19.7% ( Figure 9 ), its ratio is less than the ratio of commercially available Pt / C-JM and commercially available Pt / C-TKK described in Example 1. The results of electrochemical cataly...

Embodiment 3

[0083] Synthesis and catalytic performance of embodiment 3, Pt metal nanocluster composite catalyst (Pt content: 41wt%)

[0084] Change the mass of conductive carbon black to 29.7 mg, and synthesize according to the steps and conditions described in Example 1 to obtain a Pt metal nanocluster catalyst.

[0085] ICP-AES test shows that the mass percentage of Pt metal nanoclusters in the prepared nanocomposite catalyst is 41wt%. TEM analysis ( Figure 12 , Figure 13 ) shows that the number-average particle size of the Pt metal nanoclusters in the catalyst is 2.5nm, and the standard deviation of particle size distribution is 0.5nm. In the transmission electron microscope image, it can be seen that the morphology is projected as a hexagonal Pt nanocluster. The statistical results show that the Pt nanoparticles whose morphology is projected as hexagon account for 6% of the total number of nanoparticles. The longest diagonal of the hexagon is 2.0 nm to 3.2 nm. Elemental analysi...

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Abstract

The invention discloses a supported metal nanocluster composite catalyst and its preparation method and application. The catalyst has the characteristics of high metal loading, small size of metal nanoclusters, high dispersion, high crystal face ratio for metal nanoclusters to catalyze oxygen reduction reaction, large electrochemical active area, and contains small-sized metal nanoparticles whose morphology is projected into a hexagonal shape. It has the characteristics of crystal and has high quality catalytic activity for reactions such as oxygen reduction, and has broad application prospects in catalyzing chemical processes such as fuel cell reactions.

Description

technical field [0001] The invention relates to a metal nano-cluster composite catalyst, its preparation method and its application in catalytic fuel cell reaction. Background technique [0002] A fuel cell is a device that can directly convert chemical energy into electrical energy, and has the advantages of high energy conversion efficiency, rapid start-up, and environmental friendliness. Catalysts are an important component in fuel cells. In order to improve the energy utilization efficiency of fuels and reduce the internal resistance of batteries, in addition to excellent catalytic properties, catalysts in practical applications also need to have high metal loading and good metal dispersion. However, when the metal loading is increased, some primary particles will be close to each other, and the particles are more likely to aggregate and grow up, which will lead to a decrease in the catalytic performance of the catalyst. [0003] Many studies have shown that for fuel c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/92B82Y30/00B82Y40/00B01J35/00
CPCH01M4/8647H01M4/926B82Y30/00B82Y40/00B01J31/28B01J35/393B01J35/00B01J35/30B01J35/33Y02E60/50
Inventor 王远郭萌刘岩
Owner 无锡盛鑫氢能科技有限公司
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