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Electrocatalyst with sandwich structure, and preparation method and application thereof

An electrocatalyst and sandwich technology, applied in structural parts, fuel cell half-cells and secondary battery-type half-cells, circuits, etc., can solve the problems of severe agglomeration of nanoparticles and degradation of electrochemical performance, and achieve high internal Effects of activity, high current density, and low overpotential

Active Publication Date: 2021-06-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a kind of electrocatalyst of sandwich structure and its preparation method and application, utilize the graphene that has high specific surface area, high conductivity, unique honeycomb lattice structure as carbon Support, designed to solve the problem of electrochemical performance degradation caused by severe agglomeration of nanoparticles and limited porous channels during carbonization of most metal complexes

Method used

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  • Electrocatalyst with sandwich structure, and preparation method and application thereof
  • Electrocatalyst with sandwich structure, and preparation method and application thereof
  • Electrocatalyst with sandwich structure, and preparation method and application thereof

Examples

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Embodiment 1

[0028] This embodiment provides a method for preparing an electrocatalyst with a sandwich structure, which is obtained through the following steps:

[0029] Step 1): Add 3g of graphite powder to 120ml of concentrated sulfuric acid, slowly add 15g of KMnO under stirring 4 , transferred to a 35°C oil bath and stirred for 2 hours, then slowly added 250ml of deionized water, reacted for 1.5 hours and then added H 2 o 2 , after cooling to room temperature, suction filtration and washing, dialysis, freeze-drying and storage.

[0030] Step 2): get 0.5g of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in DMF, then add 0.1 g of graphene oxide from step 1 into it, stir and ultrasonically 1 h to form a uniformly dispersed mixed solution.

[0031] Step 3): Dissolve 0.5g of adenine in DMF under heating conditions (specific temperature 155°C), add the mixed solution obtained in step 1 into it, stir for 4 hours, and after cooling to room temperature, carry out centrifugal wa...

Embodiment 2

[0034] This embodiment provides a method for preparing an electrocatalyst with a sandwich structure, which is obtained through the following steps:

[0035] Step 1): Add 3g of graphite powder to 120ml of concentrated sulfuric acid, slowly add 15g of KMnO under stirring 4 , transferred to a 35°C oil bath and stirred for 2 hours, then slowly added 250ml of deionized water, reacted for 1.5 hours and then added H 2 o 2 , after cooling to room temperature, suction filtration and washing, dialysis, freeze-drying and storage.

[0036] Step 2): get 0.5g of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in DMF, then add 0.2 g of graphene oxide from step 1 into it, stir and ultrasonically 1 h to form a uniformly dispersed mixed solution.

[0037] Step 3): Dissolve 0.5g of adenine in DMF under heating conditions (155°C), add the mixed solution obtained in Step 1, stir for 4 hours, and after cooling to room temperature, carry out centrifugation to collect the precipitate, ...

Embodiment 3

[0040] This embodiment provides a method for preparing an electrocatalyst with a sandwich structure, which is obtained through the following steps:

[0041] Step 1): Add 3g of graphite powder to 120ml of concentrated sulfuric acid, slowly add 15g of KMnO under stirring 4 , transferred to a 35°C oil bath and stirred for 2 hours, then slowly added 250ml of deionized water, reacted for 1.5 hours and then added H 2 o 2 , after cooling to room temperature, suction filtration and washing, dialysis, freeze-drying and storage.

[0042] Step 2): get 0.5g of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in DMF, then add 0.3 g of graphene oxide from step 1 into it, stir and ultrasonically 1 h, to form a uniformly dispersed mixed solution.

[0043]Step 3): Dissolve 0.5g of adenine in DMF under heating conditions (155°C), add the mixed solution obtained in Step 1, stir for 4 hours, and after cooling to room temperature, carry out centrifugation to collect the precipitate, ...

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Abstract

The invention relates to an electrocatalyst with a sandwich structure, and a preparation method and application thereof. The preparation method comprises the following steps: 1) taking graphite powder as a raw material, adopting an improved Hummer method, and performing washing, dialysis and drying to obtain graphene oxide ; 2) blending a certain amount of graphene oxide obtained in step (1) with transition metal salt in a solvent, and stirring and ultrasonically dispersing until the graphene oxide is uniformly dispersed; 3) dissolving a certain amount of a nitrogen source in a solvent under a heating condition, adding the solution obtained in step (2) into the solvent, heating and stirring, carrying out centrifugal washing after the reaction is cooled to room temperature, collecting a product, and freeze-drying; and 4) placing the product obtained in step 3) in an inert atmosphere, and carrying out high-temperature carbonization treatment to obtain the electrocatalyst with the sandwich structure. The invention aims to solve the problem of electrochemical performance reduction caused by serious agglomeration of nanoparticles and limited porous channels in the carbonization process of most metal complexes.

Description

technical field [0001] The invention relates to the technical field of electrocatalyst materials, in particular to an electrocatalyst with a sandwich structure and a preparation method and application thereof. Background technique [0002] Energy and the environment are the most critical themes in the 21st century. Since the industrial revolution, the combustion of a large amount of fossil fuels has caused inevitable environmental problems. In order to solve the existing energy crisis and environmental pollution problems, people have carried out a lot of research and development on new efficient, clean and sustainable energy in recent years. Among them, metal-air batteries have attracted much attention due to their high energy density, high energy conversion rate, and environmental friendliness, and have shown great potential in the fields of new energy vehicles and portable electronic communication devices. However, the oxygen reduction reaction (ORR) at the air electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/08B82Y40/00B82Y30/00
CPCH01M4/9041H01M4/9083H01M12/08B82Y30/00B82Y40/00
Inventor 沈梦霞高昆段超卢万里胡伟航刘俊倪永浩
Owner SHAANXI UNIV OF SCI & TECH
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