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A nitrogen-doped carbon material rich in CNTs and CO particles with bifunctional oxygen catalytic performance and its preparation method and application

A nitrogen-doped carbon, dual-functional technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of unstable MOFs structure, poor electrical conductivity of MOFs structure, and poor contact effect , to achieve the effect of improving catalytic performance, high specific surface area and improving conductivity

Active Publication Date: 2019-12-20
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in most researches on using MOFs as ORR or OER catalysts, MOFs are usually used as substrates or precursors or combined with other materials to show excellent catalytic performance, and few people use pure MOFs as electrochemical catalysts.
This is because the MOFs structure is very unstable in aqueous solution, and the microporous MOFs have poor contact with the electrode surface, that is, the conductivity of the MOFs structure is poor.

Method used

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  • A nitrogen-doped carbon material rich in CNTs and CO particles with bifunctional oxygen catalytic performance and its preparation method and application
  • A nitrogen-doped carbon material rich in CNTs and CO particles with bifunctional oxygen catalytic performance and its preparation method and application
  • A nitrogen-doped carbon material rich in CNTs and CO particles with bifunctional oxygen catalytic performance and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A nitrogen-doped carbon material rich in CNTs and Co particles with bifunctional oxygen catalytic performance, which is prepared as follows:

[0035] (1) Synthesis of CoZn-PhIM

[0036] Weigh 0.75 g of benzimidazole, stir and dissolve in 20 mL of DMF at room temperature to form solution A. Weigh 0.562 g of cobalt nitrate hexahydrate and 0.192 g of zinc nitrate hexahydrate, stir and dissolve in 25 mL of DMF at room temperature to form solution B. Slowly pour B into A, stir for 5 min, then pour into a 100 mL blue cap bottle, stand still at 110°C for 72 h, centrifuge the mixture at a speed of 5000 r / min, wash with DMF for 3 times, and dry in vacuum at low temperature for 12 h , 200 o C was activated in vacuum for 24 h to obtain the CoZn-PhIM precursor.

[0037] (2) Synthesis of Co@PC-CNTs

[0038] Weighed 200 mg of CoZn-PhIM from step (1) into a tube furnace, raised it to 900 °C at a rate of 5 °C / min in an argon atmosphere, and calcined for 3 h to obtain 30.5 mg Co@PC-...

Embodiment 2

[0040] A nitrogen-doped carbon material rich in CNTs and Co particles with bifunctional oxygen catalytic performance, which is prepared as follows:

[0041] (1) Synthesis of CoZn-PhIM

[0042] Weigh 0.75 g of benzimidazole, stir and dissolve in 20 mL of DMF at room temperature to form solution A. Weigh 0.375 g of cobalt nitrate hexahydrate and 0.383 g of zinc nitrate hexahydrate, stir and dissolve in 25 mL of DMF at room temperature to form solution B. Slowly pour B into A, stir for 5 min, then pour into a 100 mL blue cap bottle, stand still at 110°C for 72 h, centrifuge the mixture at a speed of 5000 r / min, wash with DMF for 3 times, and dry in vacuum at low temperature for 12 h , 200 °C vacuum activation for 24 h, the CoZn-PhIM precursor was obtained.

[0043] (2) Synthesis of Co@PC-CNTs

[0044] Weighed 200 mg of CoZn-PhIM from step (1) into a tube furnace, raised it to 900 °C at a rate of 5 °C / min in an argon atmosphere, and calcined for 3 h to obtain 27.6 mg Co@PC-CNTs. ...

Embodiment 3

[0046] A nitrogen-doped carbon material rich in CNTs and Co particles with bifunctional oxygen catalytic performance, which is prepared as follows:

[0047] (1) Synthesis of CoZn-PhIM

[0048] Weigh 0.75 g of benzimidazole, stir and dissolve in 20 mL of DMF at room temperature to form solution A. Weigh 0.188 g of cobalt nitrate hexahydrate and 0.576 g of zinc nitrate hexahydrate, stir and dissolve in 25 mL of DMF at room temperature to form solution B. Slowly pour B into A, stir for 5 min, then pour into a 100 mL blue cap bottle, stand still at 110°C for 72 h, centrifuge the mixture at a speed of 5000 r / min, wash with DMF for 3 times, and dry in vacuum at low temperature for 12 h , 200 o C was activated in vacuum for 24 h to obtain the CoZn-PhIM precursor.

[0049] (2) Synthesis of Co@PC-CNTs

[0050] Weighed 200 mg of CoZn-PhIM from step (1) into a tube furnace, raised it to 900 °C at a rate of 5 °C / min in an argon atmosphere, and calcined for 3 h to obtain 27.6 mg Co@PC-...

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PUM

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Abstract

The invention relates to a nitrogen-doped carbon material with dual functional oxygen catalysis performance and rich in CNTs and Co particles and a preparation method of the nitrogen-doped carbon material. The preparation method comprises the following steps: S1, synthesis of CoZn-PhIM: dissolving benzimidazole in dimethylformamide to form a solution A, and dissolving cobalt salt and zinc salt inthe dimethylformamide while stirring to form a solution B; mixing the solution A with the solution B and stirring, then leaving the mixed liquor standstill in an oven, and centrifuging, washing, drying and activating the mixed liquor to obtain a CoZn-PhIM precursor; and S2, synthesis of a nitrogen-doped carbon material rich in CNTs and Co particles: placing the CoZn-PhIM precursor obtained in theS1 in a tube furnace, and calcining the CoZn-PhIM precursor at high temperature under an inert gas atmosphere to obtain the nitrogen-doped carbon material rich in CNTs and Co particles. The provided nitrogen-doped carbon material mainly comprises porous carbon, has high specific surface area, nitrogen content and degree of graphitization, and meanwhile is rich in nano-sized Co nano-particles and bent carbon nanotubes. The material has dual functional oxygen catalysis performance of electrocatalytic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), and can be used in the field of electro-catalysis as a dual functional electrocatalytic oxygen catalyst.

Description

technical field [0001] The invention relates to the field of nano-energy, in particular to a nitrogen-doped carbon material rich in CNTs and Co particles with bifunctional oxygen catalytic performance, its preparation method and application. Background technique [0002] Catalytic materials for lithium-air batteries include noble metals (Pt, Ru, Ir, etc.) and their alloys, porous carbon materials, transition metal oxides, transition metal hydroxides, etc. Although the above catalysts have shown good catalytic activity and stability for the electrode reaction of lithium-air batteries, it is still very challenging to find a class of catalysts with both ORR activity and OER activity. There is still a long way to go to realize the proper charge and discharge capacity of lithium-air batteries in industrial production. [0003] Since the first synthesis of metal-organic frameworks (MOFs) in the 1990s, due to its high specific surface area, adjustable pore size, functional modific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10H01M4/90
CPCY02E60/50
Inventor 李光琴李银乐李满荣赵德鹏
Owner SUN YAT SEN UNIV