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Preparation method of iron, cobalt and nitrogen co-doped hierarchical pore carbon nanosheet oxygen reduction catalyst

A technology of graded porous carbon and nanosheets, which is applied in electrical components, battery electrodes, circuits, etc., to achieve the effect of simple preparation method and high oxygen reduction activity

Inactive Publication Date: 2018-10-19
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the templates (CNT, MnO 2 nanowires, Te nanowires, and nanotubes) cannot induce the uniform growth of MOF nanoparticles on its surface, and MOFs crystals can only grow randomly on the template surface under the action of surfactants (such as polyvinylpyrrolidone PVP)

Method used

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  • Preparation method of iron, cobalt and nitrogen co-doped hierarchical pore carbon nanosheet oxygen reduction catalyst
  • Preparation method of iron, cobalt and nitrogen co-doped hierarchical pore carbon nanosheet oxygen reduction catalyst
  • Preparation method of iron, cobalt and nitrogen co-doped hierarchical pore carbon nanosheet oxygen reduction catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of ZnO nanosheets

[0047] Add 55mL 0.02mol L to a 100mL Erlenmeyer flask –1 Zn(AC) 2 2H 2 O aqueous solution, under stirring, 5mL2mol L –1 Aqueous NaOH solution was added dropwise to the above solution, and after the dropwise addition was completed, it was stirred for 30 min, and a white precipitate was formed at room temperature. The mixture was then transferred to an autoclave and maintained at 150 °C for 3 h in an oven. After cooling to room temperature, ZnO nanosheets were obtained by centrifugation, washing, drying and crystallization.

[0048] (2) Preparation of core-shell structure ZnO@Zn / Fe / Co-ZIF precursor

[0049] Take step 1) 80.0 mg of ZnO nanosheets was added to an Erlenmeyer flask filled with a mixed solvent of DMF and water (64 mL, volume ratio 3:1), ultrasonicated for 20 min at room temperature to fully diffuse, and then 0.66 g of 2-methyl For imidazole, after ultrasonication for 5 minutes, add 20 mg of iron triacetylacetonate for...

Embodiment 2

[0055] (1) Preparation of ZnO nanosheets

[0056] Add 55mL 0.02mol L to a 100mL Erlenmeyer flask –1 Zn(AC) 2 2H 2 O aqueous solution, under stirring, 5mL2mol L –1 Aqueous NaOH solution was added dropwise to the above solution, and after the dropwise addition was completed, it was stirred for 30 min, and a white precipitate was formed at room temperature. The mixture was then transferred to an autoclave and maintained at 150 °C for 3 h in an oven. After cooling to room temperature, ZnO nanosheets were obtained by centrifugation, washing, drying and crystallization.

[0057] (2) Preparation of core-shell structure ZnO@Zn / Fe-ZIF precursor

[0058] Take step 1) 80.0 mg of ZnO nanosheets was added to an Erlenmeyer flask filled with a mixed solvent of DMF and water (64 mL, volume ratio 3:1), ultrasonicated for 20 min at room temperature to fully diffuse, and then 0.66 g of 2-methyl For imidazole, after ultrasonication for 5 minutes, add 20.0 mg of iron triacetylacetonate, mix...

Embodiment 3

[0064] (1) Preparation of ZnO nanosheets

[0065] Add 55mL 0.02mol L to a 100mL Erlenmeyer flask –1 Zn(AC) 2 2H 2 O aqueous solution, under stirring, 5mL2mol L –1 Aqueous NaOH solution was added dropwise to the above solution, and after the dropwise addition was completed, it was stirred for 30 min, and a white precipitate was formed at room temperature. The mixture was then transferred to an autoclave and maintained at 150 °C for 3 h in an oven. After cooling to room temperature, ZnO nanosheets were obtained by centrifugation, washing, drying and crystallization.

[0066] (2) Preparation of core-shell structure ZnO@Zn / Co-ZIF precursor

[0067] Take step 1) 80.0 mg of ZnO nanosheets was added to an Erlenmeyer flask filled with a mixed solvent of DMF and water (64 mL, volume ratio 3:1), ultrasonicated for 20 min at room temperature to fully diffuse, and then 0.66 g of 2-methyl Imidazole, after ultrasonication for 5 minutes, add 25.0 mg of cobalt nitrate hexahydrate, mix ...

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Abstract

The invention provides a preparation method of an iron, cobalt and nitrogen co-doped hierarchical pore carbon nanosheet oxygen reduction catalyst. According to the method, a ZnO nanosheet is taken asa template and a zinc source, 2-methylimidazole is taken as organic ligand, iron acetylacetonate is taken as an iron source, cobalt salt is taken as a cobalt source, and a core-shell structure ZnO@Zn / Fe / Co-ZIF precursor taking the ZnO nanosheet as a core and trimetallic hybrid zeolitic imidazolate skeleton compound Zn / Fe / Co-ZIF as a shell is obtained through the regulation of the ratio of the cobalt source to the iron source and adoption of a solvothermal method. ZnO@Zn / Fe / Co-ZIF is subjected to high-temperature calcinations in inert atmosphere, and the iron, cobalt and nitrogen co-doped hierarchical pore carbon nanosheet oxygen reduction catalyst is directly obtained. The method has the advantages that acid pickling is not required to remove a core layer template, an obtained carbon nanosheet is high in specific surface area, has a hierarchical pore structure, is rich in catalytic activity sites, and shows higher oxygen reduction catalytic activity than that of an iron and nitrogen doped carbon nanosheet and a cobalt and nitrogen doped carbon nanosheet.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to a preparation method of an iron-cobalt-nitrogen co-doped hierarchical porous carbon nanosheet oxygen reduction catalyst. Background technique [0002] With the development of society, energy consumption and environmental pollution are becoming more and more serious, so the storage and conversion of energy has become particularly important. The research and development of fuel cells and metal-air batteries can provide options for solving environmental problems and energy crises. At present, the fundamental factor restricting the development of fuel cells and metal-air batteries is the activity and stability of air electrode catalysts. Platinum (Pt)-based catalysts are the most commonly used and effective catalysts for air electrodes. However, due to the lack of Pt resources, high price, and easy poisoning, it is difficult to achieve large-scale application. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9008Y02E60/50
Inventor 宋肖锴郭琳丽周雅静石佳慧刘祥媛
Owner JIANGSU UNIV OF TECH
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