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Bimetallic atom hollow carbon nanosphere catalyst and preparation method thereof

A carbon nanosphere, catalyst technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of large overpotential and difficult large-scale preparation, and achieve large half-wave potential, preparation The method is simple and the effect of low initial potential

Active Publication Date: 2020-06-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the diatomic catalyst still has the problem of large overpotential and difficulty in large-scale preparation. Therefore, the preparation of a bimetallic hollow nanosphere catalyst with a lower overpotential is very important for the application of air batteries and even new energy sources. of great significance

Method used

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  • Bimetallic atom hollow carbon nanosphere catalyst and preparation method thereof
  • Bimetallic atom hollow carbon nanosphere catalyst and preparation method thereof
  • Bimetallic atom hollow carbon nanosphere catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing FeCu-N-HC nanosphere catalyst includes the following steps:

[0036] Step 1: Add 3g pyrrole, 0.15g ferric nitrate, 0.19g copper nitrate and 30g hydrogen peroxide to 50ml deionized water, stir until the color of the solution changes from black to ocher, then dry the solution at 80℃, then Prepared into powder A;

[0037] Step 2: ber method synthesizes SiO with a diameter of 200nm 2 Ball: Mix 3mL of ammonia, 74mL of absolute ethanol and 10mL of deionized water and stir for 0.5h, then add 6mL of ethyl orthosilicate and stir for 6h, wait for it to turn into a milky white mixture, centrifuge to obtain a white precipitate of SiO 2 , Dry for use;

[0038] Step 3: Add 2.5g of sodium chloride and 2.5g of SiO prepared in step 2 to 50ml of deionized water in sequence 2 The template and 0.5 g of powder A prepared in step 1 are stirred until they are evenly dispersed, then placed in a freeze dryer, and freeze-dried at -40°C to obtain solid B;

[0039] Step 4: Grind th...

Embodiment 2

[0045] A method for preparing FeCu-N-HC nanospheres includes the following steps:

[0046] Step 1: Add 1g imidazole, 0.1g ferric chloride, 0.13g copper chloride and 10g hydrogen peroxide to 50ml deionized water, stir until the color of the solution changes from black to ocher, and dry the solution at 80℃ , And then prepared into powder A;

[0047] Step 2: ber method synthesizes SiO with a diameter of 200nm 2 Ball: 3mL ammonia water, 74mL absolute ethanol and 10mL deionized water were mixed and stirred for 0.5h, then 6mL ethyl orthosilicate was added and stirred for 6h to become a milky white mixture, centrifuged to obtain a white precipitate of SiO 2 , Dry for use;

[0048] Step 3: Add 3g sodium chloride and 3g SiO to 50ml deionized water in sequence 2 And 0.5g of powder A, stir until evenly dispersed, place in a freeze dryer, freeze-dry at -40°C to obtain solid B;

[0049] Step 4: Grind solid B to powder, carbonize under the protection of nitrogen atmosphere, carbonization temperatu...

Embodiment 3

[0052] A method for preparing FeCu-N-HC nanosphere catalyst includes the following steps:

[0053] Step 1: Add 1g imidazole, 0.1g ferric chloride, 0.13g copper chloride and 10g hydrogen peroxide to 50ml deionized water, stir until the color of the solution changes from black to ocher, and dry the solution at 80℃ , And then prepared into powder A;

[0054] Step 2: ber method synthesizes SiO with a diameter of 200nm 2 Ball: 3mL ammonia water, 74mL absolute ethanol and 10mL deionized water were mixed and stirred for 0.5h, then 6mL ethyl orthosilicate was added and stirred for 6h to become a milky white mixture, centrifuged to obtain a white precipitate of SiO 2 , Dry for use.

[0055] Step 3: Add 3g sodium chloride and 3g SiO to 50ml deionized water in sequence 2 And 0.5g of powder A, stir until the dispersion is evenly distributed, then place at 80°C for rotary evaporation, and dry to obtain solid B;

[0056] Step 4: Grind solid B to powder, carbonize under the protection of nitrogen a...

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Abstract

The invention provides a FeCu-N-HC nanosphere catalyst and a preparation method thereof, and belongs to the field of air battery catalytic materials. The preparation method comprises: firstly formingFeCu-N coordination, physically mixing NaCl and SiO2 nanosphere templates, then preparing the FeCu-N6-containing hollow carbon nanospheres through carbonization, and the BET specific surface area being 610 m<2> g<-1>. Due to the fact that the Fe-Cu synergistic coordination ligand is formed firstly, when oxygen reduction catalysis is conducted on the finally-prepared FeCu-N6, the catalysis steps can be effectively shortened, and the catalysis rate of active sites is increased. The FeCu-N-HC hollow carbon nanosphere prepared by the method is used as an oxygen reduction catalyst, and the catalytic performance and the stability of the FeCu-N-HC hollow carbon nanosphere are superior to those of a current commercial 20% Pt / C catalyst.

Description

Technical field [0001] The invention belongs to the field of air battery catalytic materials, and specifically relates to a FeCu-N-HC (Hollow Carbon) hollow carbon nanosphere and a preparation method thereof, and the application of the nanosphere as an oxygen reduction functional catalyst. Background technique [0002] The electrochemical oxygen reduction reaction (ORR) is a key step that restricts the performance of air batteries. Its efficiency is directly related to the performance of the battery, and the catalyst is the top priority associated with this reaction. Traditional catalysts are mainly platinum-based noble metals because of their high ORR catalytic activity. However, the high cost and poor stability of the precious metal platinum-based catalysts limit its large-scale practical application in energy storage devices. Therefore, researchers are currently dedicated to developing low-cost, high catalytic activity oxygen reduction catalysts. [0003] So far, researchers h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88B82Y30/00B82Y40/00
CPCH01M4/9083H01M4/9041H01M4/90H01M4/8825B82Y30/00B82Y40/00Y02E60/50
Inventor 熊杰孙鹤雷天宇陈伟王显福胡安俊晏超贻
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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