A load pd@pd 4 The hollow carbon nanosphere of s and its preparation method and application

A carbon nanosphere and hollow technology, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of low cycle life of lithium-oxygen batteries, easy collapse of catalyst structure, and small specific surface area. Achieve excellent electrocatalytic performance, good electrical conductivity, and large specific surface area

Active Publication Date: 2021-11-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the carbon-loaded Pd prepared by the existing preparation method 4 The S catalyst still has the disadvantages of small specific surface area, poor conductivity, and easy collapse of the catalyst structure during charging and discharging, resulting in low cycle life of lithium-oxygen batteries. The invention provides a loaded Pd@Pd 4 The hollow carbon nanosphere of S and its preparation method and application, the loading Pd@Pd 4 The hollow carbon nanospheres of S have a high specific surface area and efficient catalytic performance. When used as a cathode catalyst material for a lithium-oxygen battery, it can effectively promote the production of lithium peroxide during discharge and provide sufficient storage space. When charging, Pd@ PD 4 The S heterojunction is conducive to the efficient decomposition of lithium peroxide, and the porous carbon structure provides a good material transport channel during the charge and discharge process.

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  • A load pd@pd <sub>4</sub> The hollow carbon nanosphere of s and its preparation method and application
  • A load pd@pd <sub>4</sub> The hollow carbon nanosphere of s and its preparation method and application
  • A load pd@pd <sub>4</sub> The hollow carbon nanosphere of s and its preparation method and application

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preparation example Construction

[0034] In an embodiment of the present invention, a load Pd@Pd 4 The preparation method of the hollow carbon nanosphere of S, comprises the steps:

[0035] S1. preparing hollow carbon nanospheres;

[0036] S2. Preparation of palladium nanoparticles in situ: mix the hollow carbon nanospheres obtained in S1 with divalent palladium salt solution and hexadecyltrimethylammonium chloride solution, and then add a reducing agent solution to obtain palladium-loaded A suspension of hollow carbon nanospheres of nanoparticles;

[0037] S3. Preparation of supported Pd@Pd 4Hollow carbon nanospheres of S: The hollow carbon nanospheres loaded with palladium nanoparticles obtained in S2 were vulcanized in an inert atmosphere to prepare loaded Pd@Pd 4 S hollow carbon nanospheres.

[0038] In an embodiment of the present invention, in step S2, the divalent palladium salt includes Pd(NO 3 ) 2 , PdCl 2 , PdSO 4 2H 2 O, H 2 PdCl 4 、K 2 PdCl 4 、Na 2 PdCl 4 The one in; Preferably, the ...

Embodiment 1

[0063] Load Pd@Pd 4 The hollow carbon nanospheres of S are prepared by the following steps:

[0064] (1) Preparation of hollow carbon nanospheres

[0065] Mix 70mL absolute ethanol, 10mL deionized water and 3mL ammonia water with a mass fraction of 25% evenly, add 3.46mL tetraethyl orthosilicate dropwise, stir for about 15min with magnetic force, add 0.4g resorcinol and 0.56mL mass fraction After 37% formaldehyde was stirred magnetically for 24 h, the product was collected by centrifugation and washed three times with deionized water, dried in vacuum at 60 ° C for 6 h, and the precipitate was placed in N 2 Atmosphere at 2°C·min -1 The heating rate was heated to 700°C and kept for 2h. The obtained black powder was corroded in 50mL of 40% hydrofluoric acid solution for 3h, washed with deionized water for 5 times, and then vacuum-dried at 60°C for 12h.

[0066] (2) Prepare H 2 PdCl 4 the solution

[0067] 0.1774g PdCl 2 Solubility in 10mL is 0.4mol·L -1 hydrochloric acid,...

Embodiment 2

[0076] (1) Preparation of hollow carbon nanospheres

[0077] Mix 80mL absolute ethanol, 10mL deionized water and 3mL ammonia water with a mass fraction of 18% evenly, add 3.46mL tetraethyl orthosilicate dropwise, stir for about 15min by magnetic force, add 0.2g resorcinol and 0.56mL mass fraction After 30% formaldehyde was stirred magnetically for 24 hours, the product was collected by centrifugation and washed three times with deionized water, dried in vacuum at 60°C for 6 hours, and the precipitate was placed in N 2 Atmosphere at 2°C / min -1 The heating rate was heated to 800°C and kept for 2.5h, the obtained black powder was corroded in 50mL hydrofluoric acid solution with a mass fraction of 40% for 3h, centrifuged and washed with deionized water for 5 times, and then vacuum-dried at 60°C for 12h .

[0078] (2) Prepare H 2 PdCl 4 the solution

[0079] 0.1774g PdCl 2 Solubility in 10mL is 0.4mol·L -1 hydrochloric acid, stirred until completely dissolved, and then dilut...

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Abstract

The invention provides a load Pd@Pd 4 Hollow carbon nanospheres of S and its preparation method and application. The resulting load Pd@Pd 4 The hollow carbon nanospheres of S have high conductivity, excellent catalytic activity, and the hollow porous structure effectively solves the problem of volume expansion caused by the accumulation and decomposition of discharge products during the charge and discharge process, making it exhibit good cycle performance. At the same time, the production process is simple and reliable, easy to scale up production, and no toxic and harmful by-products are generated during the reaction process, which is green and safe, and provides useful assistance for the actual industrial application of lithium-oxygen batteries.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis of lithium-oxygen batteries, in particular to a Pd@Pd loaded 4 Hollow carbon nanospheres of S and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Due to its ultra-high theoretical energy density (up to 3505Wh kg -1 ), has become a research hotspot of scientists. However, the research on lithium-oxygen batteries is still in its infancy. Slow oxygen reduction and oxygen evolution reaction kinetics lead to high overpotential, poor rate performance and limited cycle life. These problems restrict the further application of lithium-oxygen batteries. ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M4/92H01M12/08B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/923H01M4/926H01M12/08
Inventor张进涛刘晓猛黄启顺许浩然王俊赵兰玲
OwnerSHANDONG UNIV