Silicon-carbide-core nano compound particle coated by nitrogen-doped carbon shell and preparation method of particle

A carbon shell-coated silicon carbide and nanocomposite particle technology, which is applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of mass production of limited materials, insufficient stability, and cumbersome synthesis methods and other problems, achieve high thermal stability and chemical stability, improve service life, and simple method

Inactive Publication Date: 2014-04-23
YANSHAN UNIV
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most nitrogen-doped carbon materials still use SP 2 As the basic carbon material, the problem of insufficie...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Silicon-carbide-core nano compound particle coated by nitrogen-doped carbon shell and preparation method of particle
  • Silicon-carbide-core nano compound particle coated by nitrogen-doped carbon shell and preparation method of particle
  • Silicon-carbide-core nano compound particle coated by nitrogen-doped carbon shell and preparation method of particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 20mg of cubic silicon carbide particles with an average particle size of 60nm, put them into a crucible, add two drops of saturated nickel chloride solution, stir evenly and dry them, then add 200mg of melamine powder and mix evenly, put them in a vacuum furnace, and vacuum to 10 -3 Pa, heated to 1000°C for 3 hours, then cooled to room temperature while maintaining a vacuum environment. The obtained powder was soaked in concentrated hydrochloric acid with a concentration of 37% for 12 hours to remove metallic nickel, washed with deionized water until neutral and dried to obtain nitrogen-doped carbon shell-coated silicon carbide core nanocomposite particles.

[0019] Such as figure 1 As shown, after vacuum heat treatment, a carbon layer is formed on the surface of nano-silicon carbide, and obvious defects can be observed in the carbon layer, which is caused by the introduction of nitrogen into the carbon layer.

[0020] Such as figure 2 As shown, peaks represent...

Embodiment 2

[0023] Take 20mg of silicon carbide whiskers with an average particle size of 100nm, put them into a crucible, add two drops of saturated nickel chloride solution, stir evenly, dry them, then put in 100mg of melamine powder and mix evenly, and vacuum to 10 -3 Pa filled with argon protection, heated to 1300 ° C for 2 hours, and cooled to room temperature under the condition of maintaining a vacuum environment. Soak the obtained powder with concentrated hydrochloric acid with a concentration of 37% for 14 hours to remove metallic nickel, wash with deionized water until neutral and dry to obtain nitrogen-doped carbon shell-coated silicon carbide core nanocomposite particles.

Embodiment 3

[0025] Take 20 mg of cubic silicon carbide particles with an average particle size of 180 nm, put them into a crucible, add two drops of saturated nickel chloride solution, stir evenly, and dry them, then add 100 mg of melamine powder and mix evenly, put them in a vacuum furnace, and pump Vacuum to 10 -3 Pa filled with nitrogen protection, heated to 1500 ° C for 0.5 hours, and cooled to room temperature under the condition of maintaining a vacuum environment. Soak the obtained powder with concentrated hydrochloric acid with a concentration of 37% for 13 hours to remove metallic nickel, wash with deionized water until neutral and dry to obtain nitrogen-doped carbon shell-coated silicon carbide core nanocomposite particles.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a silicon-carbide-core nano compound particle coated by a nitrogen-doped carbon shell. The silicon-carbide-core nano compound particle is formed by taking nano silicon carbide as the core and carbon generated on the surface of the silicon carbide in situ as the shell and doping nitrogen atoms into the carbon shell. The preparation method of the nano compound particle mainly comprises the following steps: dropping a saturated chloride solution into cubic silicon carbide particles or whiskers till the silicon carbide can be soaked by the solution completely; then drying after uniformly mixing, uniformly mixing the dried silicon carbide and tripolycyanamide or ammonium chloride, and then putting in a sintering furnace; heating to 1,000-1,500 DEG C in vacuum, argon gas or nitrogen gas atmosphere, and cooling to room temperature after preserving the heat for 0.5-3 hours; and soaking the powder after heat treatment with 37% concentrated hydrochloric acid, water-washing to neutrality, and drying. The preparation method of the nano compound particle disclosed by the invention is simple and safe, the nano compound particle which serves as a cathode catalyst of a fuel battery has high thermostability and chemical stability, so that the synthetic catalyst material has high durability, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a fuel cell catalyst and a preparation method thereof. Background technique [0002] Most of the energy demand in the world still depends on the supply of petroleum fuels, but the thermal efficiency of petroleum fuels is not only very low, but also causes environmental pollution, global warming, greenhouse effect and other problems. These issues are the focus of attention of various countries at present, and various countries have promulgated relevant laws and regulations to limit the emission of exhaust gas to protect the environment. At present, transportation is the main source of energy consumption and the biggest cause of air pollution. Although the emission of toxic gases and dust particles in modern automobiles has been greatly reduced compared with traditional automobiles, this reduction is based on the increase in energy consumption, thus increasing the emi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/90B01J27/24
CPCY02E60/50B01J27/24H01M4/90
Inventor 藏建兵潘虹王艳辉
Owner YANSHAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap