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A kind of pyridine nitrogen enrichment carbon nanotube catalyst and its preparation method and application

A carbon nanotube and pyridine nitrogen technology, which is applied in the field of electrocatalysis, can solve the problems of low percentage of pyridine nitrogen and application limitations, and achieves the effects of good stability, high catalytic performance and good application prospects.

Active Publication Date: 2021-06-29
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Many previous reports have shown that pyridinic nitrogen is the main active site of metal radical nitrogen-doped carbon materials, but the percentage of pyridinic nitrogen in nitrogen-doped carbon tubes currently available is relatively low, which limits its application.

Method used

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  • A kind of pyridine nitrogen enrichment carbon nanotube catalyst and its preparation method and application
  • A kind of pyridine nitrogen enrichment carbon nanotube catalyst and its preparation method and application
  • A kind of pyridine nitrogen enrichment carbon nanotube catalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The preparation method of pyridine nitrogen enriched carbon nanotube catalyst comprises the following steps:

[0042] 600mg of 1-10 phenanthroline and 200mg of multi-walled carbon nanotubes were dispersed into a mixed solution of 25ml of ethanol and 25ml of deionized water, stirred at room temperature for 12 hours, then evaporated to dryness at 105°C, and ground in an agate mortar Finally, the precursor of the electrocatalyst was obtained; the electrocatalyst precursor was placed in a porcelain boat, heat-treated in a tube furnace, and the temperature was raised from room temperature to 700°C at 5°C / min, kept for 3 hours, and then cooled at 3.3°C / min to room temperature, the heat treatment atmosphere is an ammonia atmosphere, and the pyridine nitrogen-enriched carbon nanotube catalyst is obtained.

[0043] The X-ray diffraction curve of the catalyst prepared in this embodiment is as follows: figure 1 It can be seen from the figure that the catalyst prepared in this exa...

Embodiment 2

[0054] Repeat Example 1, the difference is that the heat treatment temperature is changed from 700°C to 500°C, the appearance of the obtained electrocatalyst is similar to that obtained in Example 1, but the total nitrogen content is reduced to 2.0%, and the percentage of pyridine nitrogen is 58.7% %.

[0055] The catalyst prepared in this example was prepared in 0.5M NaHCO saturated with carbon dioxide 3 The Faraday efficiency-voltage diagram of carbon monoxide obtained by electrolysis in aqueous solution is as follows Image 6 As shown, the product selectivity of the electrocatalyst obtained is not much different from the electrocatalyst obtained in Example 1.

[0056] The catalyst prepared in this example was prepared in 0.5M NaHCO saturated with carbon dioxide 3 The current density-voltage diagram of carbon monoxide obtained by electrolysis in aqueous solution is as follows Figure 7 shown. The maximum current density of carbon monoxide is 13mA / cm 2 .

Embodiment 3

[0058] Repeat Example 1, the difference is that the heat treatment temperature is changed from 700°C to 300°C, the appearance of the electrocatalyst obtained is similar to the electrocatalyst obtained in Example 1, but the total nitrogen content is reduced to 1.0%, and the percentage of pyridine nitrogen is 79.6%.

[0059] The catalyst prepared in this example was prepared in 0.5M NaHCO saturated with carbon dioxide 3 Faradaic efficiency of carbon monoxide obtained by electrolysis in aqueous solution - voltage as Image 6 shown. The product selectivity of the obtained electrocatalyst is not much different from that of the electrocatalyst obtained in Example 1.

[0060] The catalyst prepared in this example was prepared in 0.5M NaHCO saturated with carbon dioxide 3 The current density-voltage diagram of carbon monoxide obtained by electrolysis in aqueous solution is as follows Figure 7 shown. The maximum current density of carbon monoxide is 8mA / cm 2 .

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Abstract

The invention discloses a pyridine nitrogen-enriched carbon nanotube catalyst. The catalyst includes carbon nanotubes and nitrogen atoms doped in the carbon nanotubes; the doping amount of the nitrogen atoms is 1-2.5wt%. The nitrogen atoms include pyridine nitrogen, and the pyridine nitrogen accounts for 55-80wt% of the total amount of nitrogen atoms. The catalyst has high content of pyridine nitrogen, and when it is used for electrocatalytic reduction of carbon dioxide into carbon monoxide, the product selectivity of carbon monoxide is high, the current density is large, and the catalyst has high stability. The invention also discloses the preparation method and application of the catalyst.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis. More specifically, it relates to a pyridine nitrogen enriched carbon nanotube catalyst and its preparation method and application. Background technique [0002] As one of the main gases that cause the greenhouse effect, carbon dioxide is emitted in large quantities and gradually intensifies the greenhouse effect, which brings about a series of problems such as sea level rise and land desertification. At the same time, carbon dioxide is a rich carbon source. If it can be converted into carbon-containing compounds to obtain fuels and chemicals, it will be able to alleviate the two important problems of energy and the environment at the same time. Therefore, the conversion of carbon dioxide is very meaningful. [0003] Noble metal-based electrocatalysts such as gold and silver can electrocatalytically reduce carbon dioxide with high selectivity and high stability at low overpotential. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C25B1/23C25B1/50C25B11/091
CPCC25B1/00C25B11/04B01J27/24B01J35/33
Inventor 马晨康鹏
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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