Flexible self-supporting Co-embedded N-doped three-dimensional porous carbon-based material as well as preparation method and application thereof

A three-dimensional porous, carbon-based material technology, applied in the field of electrocatalysis, can solve the problems of less pores, poor mass transfer effect, and inability to realize flexible self-support, and achieve the effect of high specific surface area and rich pore structure

Pending Publication Date: 2022-07-08
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific surface area and porosity of carbon-based composites supported by transition metals need to be further improved to provide more active sites for catalytic reactions.
Electrospinning materials are considered to be ideal substrate materials for transition metal-carbon composites. Qixing Zhou et al. immobilized Co / MnO hybrid nanoparticles in situ on N,S co-doped carbon nanotubes / nanofibers, and selected polyethylene Pyrrolidone (PVP) fibers are used as electrospinning substrates, but their specific surface area is only 125.6m -2 g -1 , the pore size distribution is mainly micropores, which has the disadvantages of poor mass transfer effect and fewer channels. In addition, PVP fibers are hard substrates, which cannot be flexible and self-supporting.
Preparation of transition metal nanocarbon composite bifunctional catalysts with flexible properties is still a great challenge

Method used

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  • Flexible self-supporting Co-embedded N-doped three-dimensional porous carbon-based material as well as preparation method and application thereof
  • Flexible self-supporting Co-embedded N-doped three-dimensional porous carbon-based material as well as preparation method and application thereof
  • Flexible self-supporting Co-embedded N-doped three-dimensional porous carbon-based material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Dissolve 1 g of polyacrylonitrile with a weight average molecular weight of 200,000 in 5 mL of N,N-dimethylformamide (DMF), and 2 g of ZnO in 5 mL of N,N-dimethylformamide (DMF) , the two were stirred and mixed for 24 hours to obtain a spinning solution, and electrospinning was performed on the spinning solution to obtain a ZnO / PAN fiber membrane;

[0044] Among them, during electrospinning, the positive pressure is 16KV, the negative pressure is 1KV; the injection speed is 0.18mm / min; the receiving distance between the needle and the drum is 16cm;

[0045] (2) Cut the ZnO / PAN fiber membrane into 3 pieces with a size of 1cm×2cm×0.05cm, each with a mass of 0.05g, immerse it in 15mL of 2-methylimidazole solution containing 0.5g for 10min, and then add the 0.1115g of Zn(NO 3 ) 2 and 0.1091g of Co(NO 3 ) 2 The mixed solution of metal salts formed by dissolving in 15 mL of deionized water was stirred for 40 min. After the reaction, washed with deionized water and fre...

Embodiment 2

[0052] (1) Dissolve 2 g of ZnO and 1 g of polyacrylonitrile with a weight average molecular weight of 200,000 in 10 mL of N,N-dimethylformamide (DMF), and stir and mix for 24 hours to obtain a spinning solution. Carry out electrospinning to obtain ZnO / PAN fiber membrane;

[0053] Among them, during electrospinning, the positive pressure is 16KV, the negative pressure is 1KV; the injection speed is 0.18mm / min; the receiving distance between the needle and the drum is 16cm;

[0054] (2) Cut the ZnO / PAN fiber membrane into 3 pieces with a size of 1cm×2cm×0.05cm, each with a mass of 0.05g, immerse it in 15mL of 2-methylimidazole solution containing 0.5g for 10min, and then add the 0.1487g of Zn(NO 3 ) 2 and 0.0727g of Co(NO 3 ) 2 The mixed solution formed by dissolving in 15 mL of deionized water was stirred and reacted for 40 min. After the reaction, washed with deionized water and freeze-dried for 5 h to obtain CoZnZIF@ZnO / PAN;

[0055] (3) Put the melamine and CoZnZIF@ZnO / ...

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Abstract

The invention relates to a flexible self-supporting Co-embedded N-doped three-dimensional porous carbon-based material as well as a preparation method and application thereof, and belongs to the technical field of electro-catalysis. According to the material, flexible porous N-doped carbon nanofibers are used as a matrix, an N-doped carbon nanosheet array is loaded on the surface of the matrix, N-doped carbon nanotubes grow on the carbon nanosheet array, and Co nanoparticles are packaged in the N-doped carbon nanotubes; the Co element content is 2-3 wt%, the N element content is 6-10 at%, and the specific surface area is 350-700 m < 2 > g <-1 >. As an ORR / OER bifunctional catalyst, the material can effectively improve the mass transfer process in the catalysis process of the ORR / OER catalyst and enhance the ORR / OER catalytic activity. As a self-supported zinc air battery cathode material, the material shows ultrahigh maximum power density, specific capacity and rate capability in the discharge process.

Description

technical field [0001] The invention relates to a flexible self-supporting Co-inserted N-doped three-dimensional porous carbon-based material, a preparation method and an application thereof, and belongs to the technical field of electrocatalysis. Background technique [0002] Rechargeable flexible zinc-air batteries with high theoretical energy density (1086 Wh / kg) and high safety are expected to be the next-generation energy storage devices to meet the needs in wearable electronic devices and implantable medical devices. In the zinc-air battery system, the kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) at the air electrode are very slow, and efficient catalysts are usually required to speed up the reaction, thereby promoting the development and wide application of zinc-air batteries. Noble metal-based electrode catalysts such as RuO 2 and Pt / C, which exhibit good catalytic activity in OER and ORR, respectively, but their scarcity, high cos...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88H01M12/06B82Y30/00B82Y40/00
CPCH01M4/90H01M4/88H01M12/06B82Y30/00B82Y40/00Y02E60/50
Inventor 王博杨文秀冯霄王锦明
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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