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Cobalt and nitrogen co-doped carbon nanosheet material and preparation and application thereof

A carbon nanosheet, co-doping technology, applied in the field of electrochemistry, can solve the problems of failure to emphasize catalytic performance, large temperature influence, etc., and achieve the effects of excellent oxygen reduction activity, high porosity, and good electrical conductivity.

Inactive Publication Date: 2021-11-09
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And it can only be synthesized under low temperature conditions, which is greatly affected by temperature
In addition, it fails to emphasize in which catalytic field the synthesized catalytic material has better catalytic performance, and fails to compare with commercial catalysts

Method used

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  • Cobalt and nitrogen co-doped carbon nanosheet material and preparation and application thereof
  • Cobalt and nitrogen co-doped carbon nanosheet material and preparation and application thereof
  • Cobalt and nitrogen co-doped carbon nanosheet material and preparation and application thereof

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Effect test

Embodiment 1

[0050] A cobalt and nitrogen co-doped carbon nanosheet material, the carbon doping amount in the cobalt and nitrogen co-doped carbon nanosheet material is 87.44wt%, the cobalt doping amount is 0.99wt%, and the oxygen doping amount is 8.4wt% %, nitrogen doping amount is 3.17wt%.

[0051] Prepared by the following steps:

[0052] Weigh 1g of lactose monohydrate, 0.5g of zinc nitrate hexahydrate, and 43.8mg of cobalt nitrate hexahydrate and dissolve them in 5ml of deionized water, stir and mix evenly without obvious suspended particles, put them into a blast drying oven, and heat to 220°C rapidly , keep it warm for 20min, and get a brown-black foamy sample. Put the sample in a ceramic boat, put it into a tube furnace, and heat it at 2℃min in a nitrogen atmosphere. -1 Calcined at a heating rate of 800°C, held for 120 minutes, and cooled to room temperature, the cobalt and nitrogen co-doped carbon nanosheet material was obtained.

[0053] Depend on figure 1 It can be seen in the...

Embodiment 2

[0060] A cobalt and nitrogen co-doped carbon nanosheet material, the carbon doping amount in the cobalt and nitrogen co-doped carbon nanosheet material is 94.51wt%, the nitrogen doping amount is 2.38wt%, and the oxygen doping amount is 3.11wt% %, cobalt doping amount is 0wt%. Prepared by the following steps:

[0061] Weigh 1g of lactose monohydrate and 0.5g of zinc nitrate hexahydrate, dissolve them in 5ml of deionized water, stir and mix evenly, without obvious suspended particles, put them into a blast drying oven, heat rapidly to 220°C, and keep warm for 30min to obtain brown For black foamy samples, put the sample in a ceramic boat, put it into a tube furnace, and heat it at 2°C min in a nitrogen atmosphere. -1 Calcined at a heating rate of 850°C, held for 200 minutes, and cooled to room temperature, the cobalt and nitrogen co-doped carbon nanosheet material was obtained. Depend on Figure 5 It can be seen that when the voltage is -0.2003V, the cyclic voltammetry curve ...

Embodiment 3

[0063] A cobalt and nitrogen co-doped carbon nanosheet material, the carbon doping amount of the cobalt and nitrogen co-doped carbon nanosheet material is 93.76wt%, the nitrogen doping amount is 1.57wt%, and the oxygen doping amount is 4.16wt% , cobalt doping amount is 0.51wt%, adopts the following steps to prepare:

[0064] Weigh 1g of lactose monohydrate, 0.5g of zinc nitrate hexahydrate, and 21.9mg of cobalt nitrate hexahydrate and dissolve them in 5ml of deionized water, stir and mix evenly without obvious suspended particles, put them into a blast drying oven, and heat to 220°C rapidly , keep it warm for 40min, and get a brown-black foamy sample. Put the sample in a ceramic boat, put it into a tube furnace, and heat it at 2°C min in a nitrogen atmosphere. -1 Calcined at a heating rate of 900°C, held for 240 minutes, and cooled to room temperature, the cobalt and nitrogen co-doped carbon nanosheet material was obtained. Depend on Figure 5 It can be seen that when the vo...

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Abstract

The invention relates to a cobalt and nitrogen co-doped carbon nanosheet material and preparation and application thereof. The preparation method specifically comprises the following steps of (a) dissolving lactose monohydrate and a zinc source in water together, and uniformly stirring and mixing to obtain a mixed solution, (b) heating and evaporating the mixed solution to dryness to obtain a precursor, and (c) carbonizing the precursor obtained in the step (b) to obtain the cobalt and nitrogen co-doped carbon nanosheet material. According to the application, the cobalt and nitrogen co-doped carbon nanosheet material is used as an ORR catalyst. Compared with the prior art, the organic carbon source and the foaming agent are cheap and easy to obtain, the preparation method is simple, large-scale production is easy, and the prepared material has obvious oxygen reduction characteristics and has the advantages of being simple in preparation process, low in cost, good in stability and the like compared with a commercial platinum-carbon catalyst.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to a cobalt and nitrogen co-doped carbon nano sheet material and its preparation and application. Background technique [0002] A fuel cell is a device that converts the chemical energy of fuel directly into electrical energy. Different from general primary batteries and storage batteries, the electrode reaction active substances of fuel cells are supplied from the outside of the battery, rather than stored inside the battery. Theoretically, as long as the fuel is supplied continuously from the outside, the fuel cell can generate electricity continuously. Although the fuel cell works more like an internal combustion engine, it is not limited by the Carnot cycle and has a high energy conversion efficiency (theoretically >80%) because it does not undergo a combustion process for power generation. Due to its high energy conversion efficiency, higher energy dens...

Claims

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Application Information

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IPC IPC(8): H01M4/90B82Y30/00B82Y40/00
CPCH01M4/9041H01M4/9083B82Y30/00B82Y40/00Y02E60/50
Inventor 裴素朋孙月阳熊霞徐康伟张维韩志越
Owner SHANGHAI INST OF TECH
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