Preparation method for Fe-N-C oxygen reduction catalyst

A catalyst and solvent technology, applied in the field of fuel cell catalytic materials, can solve problems such as difficulty in maintaining the stability of catalytic current, unstable graphitized C structure, and reduced catalyst activity, so as to reduce the probability of corrosion or oxidation, low equipment requirements, The effect of hindering reunion

Inactive Publication Date: 2017-08-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] C-based catalysts randomly doped with Fe and N have been shown to have excellent catalytic activity for ORR, but as the reaction progresses, the catalytic activity decreases rapidly, making it difficult to maintain the stability of the catalytic current.
One of the important reasons is the loss of Fe species (fe-based particles lacking protection will be oxidized or dissolved in the electrolyte), resulting in unstable graphitized C structure and reduced catalytic activity.

Method used

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  • Preparation method for Fe-N-C oxygen reduction catalyst
  • Preparation method for Fe-N-C oxygen reduction catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Add 0.1g of P123 into 30ml of absolute ethanol, and disperse by ultrasonic. Then add 1.0 g of dicyandiamide and 0.34 g of ferric chloride hexahydrate, ultrasonically disperse it evenly, then raise the temperature to 50° C. and continue stirring until the solvent evaporates and becomes dry. The above dried precursor mixture was placed in a porcelain boat, heated to 250 °C under an inert atmosphere, kept for 1 h, then raised to 800 °C, kept for 2 h, and cooled to room temperature naturally. Then it was placed in 0.5M sulfuric acid solution, continuously stirred at 80°C for 8h, naturally cooled to room temperature, washed repeatedly with deionized water and then vacuum-dried to obtain a Fe-N-C catalyst with a special structure.

[0024] from figure 1 It can be seen that the Fe-N-C oxygen reduction catalyst prepared in the present invention is a composite structure in which iron nanoparticles are encapsulated in nitrogen-doped ultra-thin graphene nanosheets and curled carb...

Embodiment 2

[0026] Add 0.8g of P123 into 60ml of deionized water and ultrasonically disperse. Then add 2.0 g of melamine and 0.5 g of ferric sulfate heptahydrate, ultrasonically disperse it evenly, then raise the temperature to 80° C. and continue stirring until the solvent evaporates and becomes dry. The above-mentioned dried precursor mixture was placed in a porcelain boat, heated to 400°C under an inert atmosphere, kept for 0.5h, then raised to 900°C, kept for 3h, and cooled to room temperature naturally. Then it was placed in 6.0M sulfuric acid solution, continuously stirred at 60°C for 6h, naturally cooled to room temperature, washed repeatedly with deionized water and then vacuum-dried to obtain a Fe-N-C catalyst with a special structure.

Embodiment 3

[0028] Add 2.0g of F127 into 50ml of ethylene glycol and disperse by ultrasonic. Then add 4.0 g of urea and 1.0 g of ferric acetate tetrahydrate, ultrasonically disperse it evenly, then raise the temperature to 60° C. and continue stirring until the solvent evaporates and becomes dry. The above dried precursor mixture was placed in a porcelain boat, heated to 450°C under an inert atmosphere, kept for 2h, then raised to 950°C, kept for 1h, and cooled to room temperature naturally. Then it was placed in 5.0M hydrochloric acid solution, continuously stirred at 70°C for 10 h, cooled to room temperature naturally, washed repeatedly with deionized water and then vacuum-dried to obtain a Fe-N-C catalyst with a special structure.

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Abstract

The invention provides a preparation method for a Fe-N-C oxygen reduction (ORR) catalyst with a special structure. In a Fe-N-C composite structure, C is used as an ORR catalytic base material which mainly exists in the form of graphitized nanosheets and nanotubes; N is doped into a graphite C network framework to replace a part of C so as to strengthen the catalytic capability of the base active center; and Fe-based nanoparticles are wrapped in the C nanotubes and nanosheets to maintain the catalytic activity of the graphite C. The Fe-N-C catalyst obtained in the invention not only has high ORR catalytic activity buts also shows extremely high stability; and the adopted preparation method is simple, the equipment requirement is low, the product performance is good, and commercial popularization and application can be realized favorably.

Description

technical field [0001] The invention belongs to the field of fuel cell catalytic materials, in particular to a preparation method of an Fe-N-C oxygen reduction catalyst with a special structure. Background technique [0002] A fuel cell is a device that converts the chemical energy contained in fuel into electrical energy. It has significant advantages such as high conversion efficiency, cleanliness and pollution-free, and is expected to alleviate the dual pressure of resource crisis and environmental degradation. Therefore, it is considered to be the most promising development in the 21st century. Efficient cleaning technology. However, ORR, as a necessary process for fuel cell cathode reduction, faces difficulties such as slow kinetics, diverse reaction pathways, and high overpotential, which greatly hinder the application and development of fuel cells. Traditional ORR catalysts are dominated by platinum-based noble metal catalysts, which are favored for their high ORR ac...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9041H01M4/9083Y02E60/50
Inventor 刘洪涛黄燕平苑红艳刘开宇桑商斌
Owner CENT SOUTH UNIV
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