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Preparation method and application of a nitrogen-doped carbon nanotube/carbon nitride composite material

A nitrogen-doped carbon and composite material technology, applied in biochemical fuel cells, electrical components, battery electrodes, etc., to achieve better operation stability, easy preparation, and strong activity.

Active Publication Date: 2018-02-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the application of nitrogen-doped carbon nanotubes / carbon nitride composites as cathode oxygen reduction catalysts in MFCs containing neutral media has not been reported.

Method used

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  • Preparation method and application of a nitrogen-doped carbon nanotube/carbon nitride composite material
  • Preparation method and application of a nitrogen-doped carbon nanotube/carbon nitride composite material
  • Preparation method and application of a nitrogen-doped carbon nanotube/carbon nitride composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Preparation of Nitrogen-doped Carbon Nanotubes / Carbon Nitride Composite

[0038]Mix nitrogen-doped carbon nanotubes and solid cyanamide powder at a mass ratio of 1:50, place them in a mortar and grind for 1 hour and mix well until uniform. The mixed nitrogen-doped carbon nanotube / cyanamide powder was placed in a tube furnace, and calcined at 550° C. for 2 h. After the reaction is completed, the composite material is obtained. The composite material is washed several times with ethanol and ultrapure water, centrifuged, and then dried to form a nitrogen-doped carbon nanotube / carbon nitride composite material. The SEM morphology is as follows: figure 1 as shown, figure 1 It is the SEM topography image of the nitrogen-doped carbon nanotube / carbon nitride composite material of the embodiment of the present invention.

[0039] Step 2: Electrode Preparation

[0040] Mix the nitrogen-doped carbon nanotube / carbon nitride composite material, the conductive material car...

Embodiment 2

[0047] The difference between this example and Example 1 is that in the first step of preparing the nitrogen-doped carbon nanotube / carbon nitride composite material, nitrogen-doped carbon nanotubes and solid cyanamide powder are mixed at a mass ratio of 1:10. Other steps and parameters are the same as in Example 1.

[0048] The performance of microbial fuel cells with different catalytic electrodes is shown in Table 2.

[0049] Table 2 Performance comparison of single-chamber microbial fuel cells with different catalytic electrodes

[0050]

[0051] It can be seen from Table 2 that nitrogen-doped carbon nanotubes / carbon nitride composites are used as oxygen reduction catalysts for single-chamber microbial fuel cells, and have catalytic activity and stability comparable to conventional Pt / C catalysts, indicating that they have Potential advantages of replacing Pt / C catalysts.

Embodiment 3

[0053] The difference between this example and Example 1 is that in the first step of preparing the nitrogen-doped carbon nanotube / carbon nitride composite material, nitrogen-doped carbon nanotubes and solid cyanamide powder are mixed at a mass ratio of 1:20. Other steps and parameters are the same as in Example 1.

[0054] The performance of microbial fuel cells with different catalytic electrodes is shown in Table 3.

[0055] Table 3 Performance comparison of single-chamber microbial fuel cells with different catalytic electrodes

[0056]

[0057] It can be seen from Table 3 that nitrogen-doped carbon nanotubes / carbon nitride composites are used as oxygen reduction catalysts for single-chamber microbial fuel cells, and have catalytic activity and stability comparable to conventional Pt / C catalysts, indicating that they have Potential advantages of replacing Pt / C catalysts.

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Abstract

The present invention discloses a nitrogen-doped carbon nanotube / carbonitride composite material preparation method, nitrogen-doped carbon nanotube and solid hydrogen cyanamide powder are mixed and ground, the mixed nitrogen-doped carbon nanotube / solid hydrogen cyanamide powder is calcined for reaction, and a nitrogen-doped carbon nanotube / carbonitride composite material is obtained by washing respectively with ethanol and ultrapure water, centrifuging and drying. The present invention also discloses application of the nitrogen-doped carbon nanotube / carbonitride composite material in microbial fuel cells. The preparation method of a catalytic electrode from the nitrogen-doped carbon nanotube / carbonitride composite material is as follows: the nitrogen-doped carbon nanotube / carbonitride composite material, a conductive material and a binder are mixed nitrogen doping, a solvent is added into the mixture for evenly mixing and ultrasonically dispersing, a conductive substrate is uniformly coated with the ultrasonic mixture, and the conductive substrate is naturally dried to obtain the nitrogen-doped carbon nanotube / carbonitride composite material catalytic electrode. The method has the advantages of simple process, low cost, short cycle, and environmental friendliness, and the like.

Description

technical field [0001] The invention belongs to the technical field of new energy and new material application, and relates to a preparation method of a composite material and its application in a microbial fuel cell cathode. Background technique [0002] Microbial fuel cells (MFCs) are the product of the combination of microorganisms and fuel cell technology. The basic principle is that organic matter is oxidized and decomposed by microorganisms in the anaerobic environment to release electrons and protons, and electrons rely on suitable transfer media. Effective transfer between the biological component and the anode, and transfer to the cathode through the external circuit, while the protons are transferred to the cathode through the electrolyte, and the oxidant (usually oxygen) gets electrons and is reduced at the cathode, and at the same time combines with the protons to form water, and finally To achieve the effect of generating current. Since MFCs can generate clean ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/86H01M8/16
CPCH01M4/8652H01M4/90H01M8/16Y02E60/50
Inventor 冯雷雨孙寒曹越陈银广
Owner TONGJI UNIV
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