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N, S co-doped porous carbon coated carbon nanotube bifunctional oxygen electrode catalyst and preparation method thereof

A catalyst, porous carbon technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of poor controllability of doping atomic structure, inability to dope heteroatoms, complicated preparation process, etc. The problem is that the preparation process is green and pollution-free, conducive to large-scale application, and the cost is low.

Active Publication Date: 2021-01-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in-situ and efficient preparation methods for doping diatoms or polyatoms are still relatively limited, usually need to use templates and post-treatment with hydrofluoric acid or sodium hydroxide to remove templates, causing environmental pollution while complicate the preparation process
What's more, immature synthetic methods usually lead to the failure to incorporate enough heteroatoms, and the controllability of the doped atom structure is also very poor.

Method used

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  • N, S co-doped porous carbon coated carbon nanotube bifunctional oxygen electrode catalyst and preparation method thereof
  • N, S co-doped porous carbon coated carbon nanotube bifunctional oxygen electrode catalyst and preparation method thereof
  • N, S co-doped porous carbon coated carbon nanotube bifunctional oxygen electrode catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: N 1 C-CNT-900-2(N 1 In C-CNT-900-2, 1 means that the mass ratio of aniline in the raw material to the carbon substrate is 1, 900 means that the calcination temperature is 900°C, and 2 means that the calcination time is 2h)

[0046] Add 0.05g CNT to 100mL 0.2mol / L HCl, then add 0.05mL AN, and ultrasonicate for 30min to form a uniform mixed solution A, wherein the mass concentration of CNT is 0.0005g mL -1 ; 0.0625g (NH 4 ) 2 S 2 o 8 Add to 20mL 0.2mol / L HCl, ultrasonic 10min, form uniform mixed solution B, wherein, (NH 4 ) 2 S 2 o 8 The mass concentration is 0.003125g mL -1 . Then put the mixed solution A into the ice-water bath, control the temperature at 0-10°C, and stir in the ice bath for 30 minutes, then drop the B solution into the mixed solution A drop by drop, and continue to stir in the ice bath for 30 minutes after the dripping, and the stirring rate is uniform. It is 25r / min. Finally, the mixture was sealed and placed in a refrigerator f...

Embodiment 2

[0048] Example 2: N 2 C-CNT-900-2(N 2 The first 2 in C-CNT-900-2 indicates that the mass ratio of aniline in the raw material to the carbon substrate is 2, 900 indicates that the calcination temperature is 900°C, and the second 2 indicates that the calcination time is 2h)

[0049] Add 0.05g CNT to 100mL 0.2mol / L HCl, then add 0.10mL AN, and sonicate for 30min to form a uniform mixed solution A, wherein the mass concentration of CNT is 0.0005g mL -1 ; 0.125g (NH 4 ) 2 S 2 o 8 Add to 20mL0.2mol / L HCl, ultrasonic 10min, form uniform mixed solution B, wherein, (NH 4 ) 2 S 2 o 8 The mass concentration is 0.00625g mL -1 . Then put the mixed solution A into the ice-water bath, control the temperature at 0-10°C, and stir in the ice bath for 30 minutes, then drop the B solution into the mixed solution A drop by drop, and continue to stir in the ice bath for 30 minutes after the dripping, and the stirring rate is uniform. It is 25r / min. Finally, the mixture was sealed and pl...

Embodiment 3

[0051] Example 3: N 4 C-CNT-900-2(N 2 In C-CNT-900-2, 4 means that the mass ratio of aniline in the raw material to the carbon substrate is 4, 900 means that the calcination temperature is 900°C, and 2 means that the calcination time is 2h)

[0052] Add 0.05g CNT to 100mL 0.2mol / L HCl, then add 0.20mL AN, and ultrasonicate for 30min to form a uniform mixed solution A, wherein the mass concentration of CNT is 0.0005g mL -1 ; 0.250g (NH 4 ) 2 S 2 o 8 Add to 20mL0.2mol / L HCl, ultrasonic 10min, form uniform mixed solution B, wherein, (NH 4 ) 2 S 2 o 8 The mass concentration is 0.0125g mL -1 . Then put the mixed solution A into the ice-water bath, control the temperature at 0-10°C, and stir in the ice bath for 30 minutes, then drop the B solution into the mixed solution A drop by drop, and continue to stir in the ice bath for 30 minutes after the dripping, and the stirring rate is uniform. It is 25r / min. Finally, the mixture was sealed and placed in a refrigerator for 2...

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Abstract

The invention discloses an N, S co-doped porous carbon coated carbon nanotube bifunctional oxygen electrode catalyst and a preparation method thereof, and belongs to the technical field of energy materials and electrochemistry. The preparation method comprises the following steps of: dispersing a polysulfide precursor into a solvent, transferring an obtained mixture into a reaction container, andreacting at 50-300 DEG C to obtain a polysulfide precursor material; preparing a precursor of the N, S co-doped porous carbon coated CNT catalyst; and finally, putting the obtained NSC-CNT-Px materialinto a reaction furnace, heating to 600-1200 DEG C, and carrying out heat treatment to obtain the N, S co-doped porous carbon coated CNT catalyst. The catalyst prepared by the invention has a large number of pores and a high specific surface area, is beneficial to improving the ORR / OER catalytic activity of a material, is simple in preparation process, is green and pollution-free, is easy for large-scale production, and is beneficial to large-scale application.

Description

technical field [0001] The invention belongs to the technical field of energy materials and electrochemistry, and relates to an oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalyst of an oxygen electrode. It specifically relates to a new type of bifunctional non-metallic catalyst that uses carbon nanotubes (CNT) as a carrier material, nitrogen-containing polymers and polysulfides as precursors, and synthesizes N and S co-doped porous carbon-coated CNTs. Preparation. Background technique [0002] With the continuous development of science and technology and the continuous increase of human demand for energy, traditional fossil energy is facing the danger of depletion. Therefore, there is an urgent need to develop green and pollution-free new energy sources and conversion devices. The theoretical energy density of metal-air batteries is high, and the metals used are usually non-toxic, non-volatile, can exist stably in the air, and have higher safety w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/396B01J35/33
Inventor 李光兰王新曹硕路中发
Owner DALIAN UNIV OF TECH
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