Preparation method of Fe3C nanoparticle-loaded porous nitrogen-doped graphene oxygen reduction catalyst

A nitrogen-doped graphene and nanoparticle technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of weak tolerance, high cost, low reserves, etc., to increase active sites, improve oxygen Reducing catalytic activity and improving ORR activity

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

AI Technical Summary

Problems solved by technology

Traditional Pt-based electrocatalysts have limited the large-scale application of fuel cells due to their low storage capacity, high cost, and weak methanol / carbon monoxide tolerance.

Method used

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  • Preparation method of Fe3C nanoparticle-loaded porous nitrogen-doped graphene oxygen reduction catalyst
  • Preparation method of Fe3C nanoparticle-loaded porous nitrogen-doped graphene oxygen reduction catalyst
  • Preparation method of Fe3C nanoparticle-loaded porous nitrogen-doped graphene oxygen reduction catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step S1: Disperse 1g of graphene oxide into 100mL of deionized water, disperse 0.5g of porphyrin iron into 50mL of N,N-dimethylformamide (DMF), ultrasonicate for 10min, mix quickly, and stir at room temperature for 24h , centrifuged, and the centrifuged product was dried in an oven at 80°C for 24 hours to obtain material A1;

[0027] Step S2: Transfer material A1 to a nickel boat and place it in a tube furnace. 2 In the atmosphere, the temperature was raised to 700°C at a heating rate of 10°C / min and kept for 180 minutes, and then the temperature was naturally cooled to room temperature to obtain material B1;

[0028] Step S3: Transfer the material B1 to a container and add a hydrofluoric acid solution with a mass concentration of 15wt% to soak for 24 hours, then wash the filtrate with high-purity water until it becomes neutral, and then dry it in a blast oven at 80°C for 6 hours to obtain the target product C1.

Embodiment 2

[0030] Step S1: mix 1g graphene oxide and 0.5g SiO 2 Disperse in 100mL of deionized water, disperse 0.5g of porphyrin iron into 50mL of DMF, sonicate for 10min, mix quickly, stir at room temperature for 24h, centrifuge, and dry the centrifuged product in an oven at 80°C for 24h to obtain material A2;

[0031] Step S2: Transfer the material A2 to a nickel boat and place it in a tube furnace. 2 In the atmosphere, the temperature was raised to 700°C at a heating rate of 10°C / min and kept for 180 minutes, and then naturally cooled to room temperature to obtain material B2;

[0032] Step S3: Transfer the material B2 to a container and add a hydrofluoric acid solution with a mass concentration of 15wt% to soak for 24 hours, then wash the filtrate with high-purity water until it becomes neutral, and then dry it in a blast oven at 80°C for 6 hours to obtain the target product C2.

Embodiment 3

[0034] Step S1: mix 1g graphene oxide and 1g SiO 2 Disperse in 100mL of deionized water, disperse 0.5g of porphyrin iron into 50mL of DMF, sonicate for 10min, mix quickly, stir at room temperature for 24h, centrifuge, and dry the centrifuged product in an oven at 80°C for 24h to obtain material A3;

[0035] Step S2: Transfer material A3 to a nickel boat and place it in a tube furnace. 2 In the atmosphere, the temperature was raised to 700°C at a heating rate of 10°C / min and kept for 180 minutes, and then naturally cooled to room temperature to obtain material B3;

[0036] Step S3: Transfer the material B3 to a container and add a hydrofluoric acid solution with a mass concentration of 15 wt% to soak for 24 hours, then wash the filtrate with high-purity water until it becomes neutral, and then dry it in a blast oven at 80°C for 6 hours to obtain the target product C3.

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Abstract

The invention discloses a preparation method of a Fe3C nanoparticle-loaded porous nitrogen-doped graphene oxygen reduction catalyst. The preparation method comprises the following specific steps: mixing and stirring graphene oxide, ferroporphyrin and a hard template agent SiO2, and carrying out centrifugal drying to obtain a material A; transferring the material A to a nickel boat, placing the nickel boat in a tubular furnace, conducting heating to 700 DEG C at a heating rate of 10 DEG C / min under the protection of inert gas, carrying out heat preservation for 180 min, and naturally conducting cooling to room temperature to obtain a material B; and transferring the material B into a container, adding an acidic solution, conducting soaking for 24 hours, washing the filtrate with high-purity water until the filtrate is neutral, and conducting drying in a blast drying oven at 80 DEG C for 12 hours to obtain the Fe3C nanoparticle-loaded porous nitrogen-doped graphene oxygen reduction catalyst. By adding the hard template agent SiO2, the specific surface area of the material is regulated and controlled, the pore structure is enriched, and the active sites of the oxygen reduction catalyst are increased, so that the oxygen reduction catalytic activity is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of oxygen reduction catalysts, in particular to a Fe 3 Preparation method of C nanoparticle-supported porous nitrogen-doped graphene oxygen reduction catalyst. Background technique [0002] In order to meet the severe challenges of increasing energy demand and environmental crisis, people have invested a lot of energy to explore renewable clean energy to replace fossil fuels. A fuel cell is a device that directly converts chemical energy in fuel and oxidant into electrical energy. It has the advantages of greenness, high efficiency, and portability. It is a new type of alternative energy with great development prospects. However, its cathode oxygen reduction reaction (ORR) kinetics is slow, which is the main factor restricting the overall efficiency of fuel cells. Conventional Pt-based electrocatalysts have limited their large-scale applications in fuel cells due to their low storage capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86
CPCH01M4/9041H01M4/9083H01M4/8652H01M4/861Y02E60/50
Inventor 高书燕张静刘云鹏张翠翠李晓沣陈野
Owner HENAN NORMAL UNIV
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