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Cellulose nanofiber-assisted nitrogen-doped carbon nanocage flexible film and preparation method thereof

A nanofiber and nitrogen-doped carbon technology, applied in the field of carbon nanomaterials, can solve the problems of insufficient electrical conductivity and electrochemical performance, and the inability to intercalate sodium, and achieve excellent electrochemical performance. The method is simple and easy, and is conducive to rapid The effect of transmission

Inactive Publication Date: 2020-03-17
QINGDAO LVJINHE ENVIRONMENTAL PROTECTION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a novel nitrogen-doped carbon nanocage flexible film and a preparation method thereof, and obtains a novel nitrogen-doped carbon nanocage flexible film, which has a regular skeleton The structure is controllable, with a high specific surface area, and there are micropores, mesopores and macropores at the same time; the porosity of the material is adjusted by controlling the deposition temperature, and the graphite layer spacing of the material is greater than the intercalation spacing of sodium ions, which solves the problem of ordinary graphite The material cannot intercalate sodium; the nitrogen element was successfully self-introduced through the acetonitrile precursor, which solved the problems of insufficient electrical conductivity and electrochemical performance of the material.

Method used

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  • Cellulose nanofiber-assisted nitrogen-doped carbon nanocage flexible film and preparation method thereof
  • Cellulose nanofiber-assisted nitrogen-doped carbon nanocage flexible film and preparation method thereof
  • Cellulose nanofiber-assisted nitrogen-doped carbon nanocage flexible film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036]Firstly, 2g of 4MgCO3·Mg(OH)2·5H2O was placed in the center of the horizontal alumina tube of the tube furnace, and then flushed with high-purity N2, the gas flow rate was 40mL min-1, and the gas flushing time was 0.5h. Then the tube furnace was turned on at a rate of 5 °C min-1, the temperature was raised to 700 °C, and then acetonitrile was quickly introduced through the gas wash bottle so that acetonitrile gas was introduced into the furnace tube at a gas flow rate of 40 mL min-1. The holding time of the tube furnace is 3h, after which the acetonitrile is quickly removed, and the furnace is cooled to room temperature with the furnace to form carbon-coated MgO powder. Then, the prepared samples were thoroughly washed with 6M HCl solution to remove the MgO template, and repeatedly washed with deionized water and ethanol, and then freeze-dried for 24 h, and finally the samples were collected to obtain nitrogen-doped hierarchical carbon nanocages. Then the mechanically se...

Embodiment 2

[0038] The method of this example is basically the same as that of Example 1, except that the temperature of the tube furnace is raised to 800° C. during the preparation of the carbon nanocage.

Embodiment 3

[0040] The method of this example is basically the same as that of Example 1, except that the temperature of the tube furnace is raised to 900° C. during the preparation of the carbon nanocage.

[0041] Figure 1-Figure 3 It is the SEM picture of the prepared carbon nanocage of embodiment 1-3, as can be seen from the figure when temperature is 700 ℃ (embodiment 1) carbon nanocage formation is irregular; When temperature rises to 800 °C (Example 2), regular carbon nanocages are formed, and the average size range of the carbon nanocages is 25-45nm. There are more gaps between the carbon nanocages, which can provide more active sites or defects for sodium ion storage and ensure excellent electrochemical performance. But when the temperature rises to 900°C (Example 3), the carbon nanocages will be seriously packed, which greatly reduces the pore volume of the material, which is not conducive to the insertion and extraction of sodium ions.

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Abstract

The invention discloses a cellulose nanofiber-assisted nitrogen-doped carbon nanocage flexible film and a preparation method thereof, and belongs to the technical field of carbon nanomaterials. The preparation method comprises the following steps: selecting a carbon deposition template, performing atmosphere washing, heating a tubular furnace, introducing acetonitrile, carrying out washing and freeze-drying, and diluting cellulose nanofibers to form a suspension; and adding a nitrogen-doped carbon nanocage, performing ultrasonic treatment and cooling, sequentially carrying out vacuum filtration and freeze drying to obtain a paper-like carbon nanocage nanocellulose film, and calcining the paper-like carbon nanocage nanocellulose film in an inert atmosphere to obtain the novel nitrogen-dopedcarbon nanocage flexible film. The product has a regular and controllable skeleton structure and a high specific surface area, has micropores, mesopores and macropores at the same time, can be applied to sodium ion batteries and sodium ion capacitors to show an excellent electrochemical performance, and can also be applied to air purifiers and gas sensitive elements.

Description

technical field [0001] The invention belongs to the technical field of carbon nanomaterials, and in particular relates to a cellulose nanofiber-assisted nitrogen-doped carbon nanocage flexible film and a preparation method thereof. Background technique [0002] The research on doping of nanomaterials has been widely concerned by people. In the liquid-phase synthesis system, how do impurities change the growth process of nano-matrix materials, what effect doping will have on the microstructure of nano-materials, and whether the structure regulation of nano-materials with specific functions can be achieved through doping, etc. It has become a hotspot and frontier of nanomaterials research. [0003] For an ideal carbon material, it should have high conductivity, large specific surface area, regular structure and pore size distribution, long-term cycle stability and electrochemical reproducibility, and it should also have certain nitrogen doping. Cellulose nanofibers are extra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15B01D53/22G01N27/26G01N27/30
CPCC01B32/15B01D53/228G01N27/26G01N27/307G01N27/308B01D2258/06B01D2257/704
Inventor 王焕磊阚景林高文献商峰
Owner QINGDAO LVJINHE ENVIRONMENTAL PROTECTION CO LTD
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