Noble metal catalyst with activated carbon confinement and preparation method and application thereof

A precious metal catalyst, activated carbon technology, applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc., can solve the problems of catalyst agglomeration, deactivation, shedding, neglected correlation, etc., to achieve high local reaction concentration, quality The effect of activity enhancement and simple process route

Inactive Publication Date: 2019-10-25
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the catalytic performance and stability of noble metal catalysts still do not meet the needs of industrial production.
This is mainly because it is difficult to synthesize an intermetallic compound with a uniform size of less than 5nm, the catalyst is prone to agglomeration and deactivation during the synthesis (needs to be calcined at a temperature higher than 700 degrees) and the catalytic process, and the precious metal catalyst is not tightly combined with the carbon material, which leads to falling off, etc. Factors, thus greatly increasing the difficulty and cost of industrial production
[0006] In addition, in the few noble metal fuel cell catalysts currently disclosed, in order to improve the catalytic efficiency of noble metal catalysts, people often choose to synthesize noble metal nanomaterials with specific morphology, ignoring the relationship between the catalyst and the support, so that after assembly into a battery Due to the existence of gas-solid-liquid three-phase interface, the actual improved activity and stability are not ideal

Method used

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  • Noble metal catalyst with activated carbon confinement and preparation method and application thereof
  • Noble metal catalyst with activated carbon confinement and preparation method and application thereof
  • Noble metal catalyst with activated carbon confinement and preparation method and application thereof

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preparation example Construction

[0046] The invention provides a preparation method of a noble metal catalyst confined by activated carbon, comprising the following steps:

[0047] A) disperse and mix noble metal salt, organic small molecule ligand, activated carbon black and organic solvent to obtain black colloid;

[0048] B) heating and drying the black colloids in sequence to obtain a precursor;

[0049] C) Calcining the precursor to obtain a noble metal catalyst.

[0050] In the present invention, firstly, noble metal salt, small organic molecule ligand, active carbon black and organic solvent are dispersed and mixed to obtain black colloid.

[0051] The present invention has no special restrictions on the dispersion method, and the dispersion method well known to those skilled in the art can be used. Those skilled in the art can select and adjust according to actual production conditions, raw material conditions and product requirements. The present invention is to ensure that activated carbon Suffici...

Embodiment 1

[0087] Weigh 7.5g of H 2 PtCl 6 ·6H 2 O, 3.35g of dicyandiamide, dispersed in 0.4L of ethanol, stirred at room temperature for 1h, then weighed 22g of KJ600, added the above dispersion solution, stirred at room temperature for 24h;

[0088] Stir the obtained product at 45°C and heat and evaporate for three days to allow the ethanol contained in the product to evaporate;

[0089] Collect the dry powder sample product, collect the dried sample into a ball mill jar and fully ball mill it into a powder, put it into a quartz porcelain boat, and calcinate it at 800°C for 2 hours in an argon atmosphere, and finally obtain a Pt-KJ noble metal catalyst.

[0090] Using X-ray diffraction, transmission electron microscope, electrochemical test and other related characterizations, it is obtained as follows figure 1 , 2 , The results shown in 3. From figure 1 According to the X-ray diffraction pattern, the product can be obtained as small Pt single substance particles, and the grain s...

Embodiment 2

[0092] Weigh 15.5g of H 2 PtCl 6 ·6H 2 O, 2.3 g CoCl 2 ·6H 2 O, 29.5g of tetra-n-butylammonium iodide, dispersed in 0.4L of ethanol, stirred at room temperature for 1h, then weighed 44.5g of KJ600, added the above dispersion solution, stirred at room temperature for 24h;

[0093] The obtained product was placed in a heating stirrer at 45°C and heated and dried for three days to fully evaporate the ethanol solvent;

[0094] Collect the dry powder sample product, collect the evaporated sample into a ball mill jar and fully ball mill it into a powder, then put it into a quartz porcelain boat, and calcinate it at 800°C for 2 hours in an argon atmosphere, and finally get Pt 3 Co-KJ noble metal catalyst.

[0095] Utilize the same characterization as embodiment 1, obtain Figure 4 , 5 , 6 results. From Figure 4 We can see from the X-ray diffraction pattern of the synthesized Pt 3 Co nanoparticles, according to the Bragg equation fitting particle radius is about 2.4nm. pas...

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Abstract

The invention provides a preparation method of a noble metal catalyst with activated carbon confinement. According to the invention, clusters containing metal salt and ligands are enabled to be easilyadsorbed by conductive carbon black by utilizing the amphipathicity of organic small-molecule ligands and the complexation thereof for noble metals and alloy ions. The metal salt clusters adsorbed bythe conductive carbon black holes form a confined space, and small particles are formed in the calcining process, so that further agglomeration cannot be carried out, and thus the 2-5nm noble metal and intermetallic nanoparticles thereof can be synthesized. The confined space further enhances the local concentration of the reaction substrate so as to acquire high catalytic activity for oxygen reduction in a fuel cell. In addition, the formation of the confined space and the experimental synthesis means of high-temperature calcination greatly improve the stability of the catalyst. Furthermore,the invention has the advantages of simple process route, simple synthesis equipment and low cost, and is applicable to large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalysts, and in particular relates to a noble metal catalyst confined by activated carbon, a preparation method and application thereof. Background technique [0002] In recent years, with the rapid consumption of fossil energy and the increasingly serious environmental pollution caused by it, people have been exploring and researching new green energy and its transformation system, in order to achieve the harmonious coexistence of man and nature and the sustainable development of society. Therefore, various new electrochemical energy sources have been widely valued and developed, especially new generation green energy sources such as fuel cells and metal-air batteries. In these new energy batteries, noble metal catalysts play an irreplaceable role. Therefore, how to reduce the cost of noble metal catalysts and increase their activity and stability has become a key field in new energy researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B82Y30/00
CPCB82Y30/00H01M4/921H01M4/926Y02E60/50
Inventor 吴长征程晗桂仁杰周天培杨波谢毅
Owner UNIV OF SCI & TECH OF CHINA
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