Nitrogen-doped hierarchical porous carbon spheres and preparation method thereof

A nitrogen-doped, multi-level pore technology, applied in structural parts, electrolytic components, electrolytic processes, etc., can solve problems that limit large-scale applications, achieve good electrocatalytic activity, and facilitate rapid diffusion

Active Publication Date: 2021-06-04
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since Pt, Ru, and Ir are noble metal elements, limited reserves and high prices limit their large-scale applications

Method used

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  • Nitrogen-doped hierarchical porous carbon spheres and preparation method thereof
  • Nitrogen-doped hierarchical porous carbon spheres and preparation method thereof
  • Nitrogen-doped hierarchical porous carbon spheres and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing nitrogen-doped hierarchically porous carbon spheres, the specific steps are as follows:

[0022] Step 1: Prepare polystyrene microspheres (PS) with a diameter of 200 nm by soap-free emulsion polymerization. 2gPS was dispersed in 40mL concentrated sulfuric acid with a mass fraction of 98% by ultrasonic, and stirred at 40℃ for 12h. After the reaction was completed, it was washed with deionized water until it was neutral. The obtained sulfonated PS microspheres were dispersed in water with a solid content of 4 mg / mL, which was recorded as SPS.

[0023] Step 2: 2.8 g of melamine and 5.3 mL of formaldehyde solution with a mass fraction of 37% were mixed and stirred at 60° C. to obtain a transparent solution.

[0024] The third step: put the polyvinyl alcohol solution with a mass fraction of 5% in the flask, and add 25 mL of SPS, 5 mL of silicon dioxide and the prepolymer obtained in the second step in sequence. Then add glacial acetic acid to adjust...

Embodiment 2

[0027] A method for preparing nitrogen-doped hierarchically porous carbon spheres, the specific steps are as follows:

[0028] Step 1: Prepare polystyrene microspheres (PS) with a diameter of 200 nm by soap-free emulsion polymerization. 2gPS was dispersed in 40mL concentrated sulfuric acid with a mass fraction of 98% by ultrasonic, and stirred at 40℃ for 8h. After the reaction was completed, it was washed with deionized water until it was neutral. The obtained sulfonated PS microspheres were dispersed in water with a solid content of 4 mg / mL, which was recorded as SPS.

[0029] Step 2: 2 g of melamine and 5 mL of formaldehyde solution with a mass fraction of 37% were mixed and stirred at 60° C. to obtain a transparent solution.

[0030] The third step: put the polyvinyl alcohol solution with a mass fraction of 5% in the flask, and add 25 mL of SPS, 5 mL of silicon dioxide and the prepolymer obtained in the second step in sequence. Then add glacial acetic acid to adjust the ...

Embodiment 3

[0033] A method for preparing nitrogen-doped hierarchically porous carbon spheres, the specific steps are as follows:

[0034] Step 1: Prepare polystyrene microspheres (PS) with a diameter of 200 nm by soap-free emulsion polymerization. 2gPS was dispersed in 40mL concentrated sulfuric acid with a mass fraction of 98% by ultrasonic, and stirred at 40℃ for 8h. After the reaction was completed, it was washed with deionized water until it was neutral. The obtained sulfonated PS microspheres were dispersed in water with a solid content of 2 mg / mL, which was recorded as SPS.

[0035] The second step: 2.5 mL of melamine and 4.5 mL of formaldehyde solution with a mass fraction of 37% were mixed and stirred at 60° C. to obtain a transparent solution.

[0036] The third step: put the polyvinyl alcohol solution with a mass fraction of 5% in the flask, and add 25 mL of SPS, 5 mL of silicon dioxide and the prepolymer obtained in the second step in sequence. Then add glacial acetic acid ...

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Abstract

The present invention relates to a bifunctional nitrogen-doped hierarchical porous carbon sphere (N-HPCS) with electrochemical catalytic oxygen reduction (ORR) / oxygen evolution (OER) and a preparation method thereof. The present invention uses polystyrene microspheres as a template, melamine / formaldehyde resin as a carbon source and a nitrogen source, and silicon dioxide as a pore-forming agent. After calcining and hydrofluoric acid corrosion, a compound with macropores, mesopores and micropores is obtained. Nitrogen-doped carbon spheres with hierarchical porous structure. The carbon spheres have good electrochemical catalytic ORR / OER performance.

Description

technical field [0001] The invention relates to a bifunctional nitrogen-doped hierarchical porous carbon sphere (N-HPCS) with electrochemical catalytic oxygen reduction (ORR) / oxygen evolution (OER) and a preparation method thereof. Background technique [0002] The demand for energy in today's society is constantly increasing, and fossil energy is far from being able to meet human needs. The stock of fossil energy on the earth is getting less and less, and the use of it will pollute the environment. Therefore, it is very necessary to seek green and sustainable energy to replace fossil energy. Fuel cells, metal-air batteries and hydrogen production from water electrolysis all play an important role in future green and sustainable energy. Electrocatalytic ORR and OER are of great significance in fuel cells, metal-air batteries, and water electrolysis for hydrogen production. At present, the catalysts mainly used for ORR are Pt and its alloys, and the catalysts for OER are o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/96C25B11/091C25B1/04
CPCC25B11/04H01M4/8885H01M4/96Y02E60/36Y02E60/50
Inventor 颜蔚陈小龙邵勤思李爱军张久俊陈昶
Owner SHANGHAI UNIV
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