Three-dimensional graphene nanoribbon/carbon nanoribbon bridged structural material, and preparation method and application thereof

A technology of graphene nanobelts and carbon nanotubes, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of reduced lithium storage space in batteries, poor stability of lithium batteries, and easy structure of GNRs. collapse and other problems, to achieve the effect of enhanced lithium storage capacity, good electrical conductivity and mechanical properties, sufficient electron transport and mass transfer

Inactive Publication Date: 2015-08-26
FUDAN UNIV
3 Cites 18 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Therefore, in the process of cyclic lithium deintercalation, the GNRs structure is easy to collapse, resulting in a ...
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Abstract

The invention belongs to the technical field of nanometer materials, and specifically relates to a three-dimensional graphene nanoribbon/carbon nanoribbon bridged aerogel material, a preparation method and application thereof. According to the invention, aerogel is prepared by assembling basic structural units formed by bridging the graphene nanoribbon stripped from the carbon nanoribbon with unstripped carbon nanoribbon and doping the basic structural units with heteroatom as needed. The preparation of the aerogel comprises the following steps: preparing a carboxylic carbon nanotube solution, wherein a proper amount of a soluble dopant is added or not added into the solution; then carrying out hydrothermal treatment so as to obtain uniform hydrogel, placing the hydrogel in an ionic impregnation agent for complete replacement, then carrying out secondary hydrothermal treatment so as to finish a stripping process; and finally, carrying out drying and carbonizing so as to obtain the graphene nanoribbon/carbon nanoribbon bridged structural aerogel. The aerogel can be used as an anode material of lithium ion battery, shows high specific capacity and excellent stability and rate performance, and has important research significance and good application prospects.

Application Domain

Material nanotechnology

Technology Topic

Cvd grapheneCarbon nanotube +12

Image

  • Three-dimensional graphene nanoribbon/carbon nanoribbon bridged structural material, and preparation method and application thereof
  • Three-dimensional graphene nanoribbon/carbon nanoribbon bridged structural material, and preparation method and application thereof
  • Three-dimensional graphene nanoribbon/carbon nanoribbon bridged structural material, and preparation method and application thereof

Examples

  • Experimental program(7)
  • Effect test(1)

Example Embodiment

[0047] Example 1
[0048] (1) Take 10 mL of 0.5 mg/mL carboxylated carbon nanotube solution, add 100 uL of pyrrole as N source, and ultrasonically disperse until a uniform suspension is formed.
[0049] (2) Seal the suspension 1 in a 15 mL hydrothermal reaction kettle and place it in an oven at 180 ℃ for 12 h to obtain a massive carbon nanotube hydrogel.
[0050] (3) Place the pre-obtained carbon nanotube hydrogel in 2 M KNO 3 The solvent is replaced in the solution for 24 hours. After the replacement is complete, the hydrogel is taken out and sealed in a 15 mL hydrothermal reactor, and then placed in an oven at 180 ℃ for 48 hours to obtain GNRsCNT hydrogel.
[0051] (4) Place the obtained hydrogel in 1L of water for replacement to wash away the remaining impurities (KNO 3 And its reaction by-products), pour out the distilled water after 10h replacement, repeat 6-8 times. Then put the cleaned hydrogel in 500 mL of tert-butanol for replacement, pour out the tert-butanol after replacement for 10 hours, repeat 3-4 times, freeze the hydrogel at -70 ℃ for ≥30 min, then After drying at 70 ℃ for 30 min, GNRsCNT aerogel was obtained; the freezing and drying processes were both carried out under a vacuum of 10 Pa.
[0052] (5) The obtained GNRsCNT aerogel was carbonized in an argon-protected high-temperature carbonization furnace (produced by Tianjin Zhonghuan Company) for 3 hours at a carbonization temperature of 1050 ℃, a heating rate of 10 ℃/min, and a cooling rate of 10 ℃ min. The nitrogen-doped GNRsCNT aerogel was obtained.

Example Embodiment

[0053] Example 2
[0054] (1) Take 15 mL of 10 mg/mL carboxylated carbon nanotube solution, add 1 mL of thiophene as S source, and ultrasonically disperse until a uniform suspension is formed2.
[0055] (2) Seal the suspension 2 in a 20 mL hydrothermal reactor and place it in an oven at 200 ℃ for 6 h to obtain a massive carbon nanotube hydrogel.
[0056] (3) Place the pre-obtained carbon nanotube hydrogel at 1 M K 2 SO 4 The solvent is replaced in the solution for 48 h. After the replacement is complete, the hydrogel is taken out and sealed in a 20 mL hydrothermal reaction vessel, and then placed in an oven at 180 ℃ for 36 h to obtain GNRsCNT hydrogel.
[0057] (4) Place the obtained hydrogel in 1 L of distilled water for replacement to wash away the remaining impurities (K 2 SO 4 And its reaction by-products), pour out the distilled water after 10 h of replacement, repeat 6-8 times. Add acetone to the hydrogel, pour out the acetone after soaking for 10 hours, repeat 4 times to obtain a ketone gel, and use supercritical CO produced by SFT in the United States 2 Dryer for 24 hours, supercritical CO 2 The critical temperature of drying is 40 ℃, the critical pressure is 7.5 Pa, and GNRs CNT aerogel is obtained.
[0058] (5) Carbonize the obtained GNRsCNT aerogel in an argon-protected high-temperature carbonization furnace (manufactured by Tianjin Zhonghuan Company) for 6 hours at a carbonization temperature of 900℃, a heating rate of 20 ℃/min, and a cooling rate of 20 ℃/min . A sulfur-doped GNRsCNT aerogel was obtained.

Example Embodiment

[0059] Example 3
[0060] (1) Take 30 mL of 15 mg/mL carboxylated carbon nanotube solution, add 3 mL of pyrrole and 3 mL of thiophene as N and S sources respectively, and ultrasonically disperse until a uniform suspension 3 is formed.
[0061] (2) Seal the suspension 3 in a 50 mL hydrothermal reactor and place it in an oven at 140 ℃ to react for 24 h to obtain a massive carbon nanotube hydrogel.
[0062] (3) Place the pre-obtained carbon nanotube hydrogel in 1 M KNO 3 The solvent is replaced in the solution for 48 h. After the replacement is complete, the hydrogel is taken out and sealed in a 50 mL hydrothermal reactor, and then placed in an oven at 180 ℃ for 60 h to obtain GNRsCNT hydrogel.
[0063] (4) Place the obtained hydrogel in 1L of water for replacement to wash away the remaining impurities (KNO 3 And its reaction by-products), pour out the distilled water after 10h replacement, repeat 6-8 times. Then add ethanol to the hydrogel, pour out the ethanol after soaking for 5 hours, repeat 4 times, add water to the hydrogel, pour out the water after soaking for 5 hours, repeat 6 times, put the hydrogel in Frozen at -80 ℃ for ≥60 min, and then dried at 40 ℃ for 48 h to obtain GNRsCNT aerogel; the freezing and drying processes were carried out under a vacuum of 1 Pa.
[0064] (5) Carbonize the obtained GNRsCNT aerogel in an argon-protected high-temperature carbonization furnace (manufactured by Tianjin Zhonghuan Company) for 3 hours at a carbonization temperature of 800 ℃, a heating rate of 10 ℃/min, and a cooling rate of 20 ℃/min . The nitrogen and sulfur co-doped GNRsCNT aerogel is obtained.
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PUM

PropertyMeasurementUnit
Specific surface area529.0 ~ 621.0m²/g
Aperture1.0nm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • Large specific surface area
  • Good mechanical properties

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