Heteroatom doped leaf-shaped carbon nanometer aerogel material and preparation method and application thereof

A carbon nanomaterial and leaf-shaped technology, which is applied in the field of carbon nanoairgel materials and its preparation, can solve problems such as hindering electron transport and mass transport, catalytic performance discount, low specific surface area, etc., and achieve rapid electron transport and mass transport And fully, the effect of inhibiting aggregation problems, large specific surface area

Inactive Publication Date: 2015-03-25
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although carbon-based catalysts have good selectivity and stability, their catalytic performance is greatly reduced due to their poor electrical conductivity and low specific surface area that hinder their electron transport and mass transfer.

Method used

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  • Heteroatom doped leaf-shaped carbon nanometer aerogel material and preparation method and application thereof
  • Heteroatom doped leaf-shaped carbon nanometer aerogel material and preparation method and application thereof
  • Heteroatom doped leaf-shaped carbon nanometer aerogel material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Take 10 mL of a 0.1 mg / mL leaf-shaped carbon nanomaterial solution, add 100 mg of pyrrole as a N source, and disperse ultrasonically until a uniform suspension is formed1.

[0052] (2) Seal the suspension 1 in a 20 mL hydrothermal reaction kettle and place it at 180 o React in an oven at C for 6 h to obtain blocky hydrogel.

[0053] (3) Add ethanol to the hydrogel, pour out the ethanol after soaking for 10 h, repeat 4 times, add water to the hydrogel, pour out the water after soaking for 10 h, repeat 2 times, pour out Glue at -25 oC Freeze for ≥30 min, then at 70 o C drying for 30 min to obtain leaf-shaped carbon nanomaterial aerogels; both freezing and drying processes were carried out under a vacuum of 10 Pa.

[0054] (4) Carbonize the obtained leaf-shaped carbon nanomaterial aerogel in an argon-protected high-temperature carbonization furnace (produced by Tianjin Zhonghuan Company) for 1 hour, and the carbonization temperature is 1000 o C, the heating rate i...

Embodiment 2

[0056] (1) Take 15 mL of 20 mg / mL leaf-shaped carbon nanomaterial solution, add 1 mL of ammonia water as a N source, and disperse ultrasonically until a uniform suspension is formed.

[0057] (2) Seal the suspension 2 in a 20 mL hydrothermal reaction kettle and place it at 120 o C in an oven for 12 h to obtain block hydrogel.

[0058] (3) Add ethanol to the hydrogel, pour out the ethanol after soaking for 10 h, and repeat 5 times to obtain an alcohol gel. 2 Desiccator drying for 24 h, supercritical CO 2 The critical temperature for drying is 40 o C, the critical pressure is 7.5 Pa, and the leaf-like carbon nanomaterial airgel is obtained.

[0059] (4) The obtained leaf-shaped carbon nanomaterial airgel was carbonized in a nitrogen-protected high-temperature carbonization furnace (produced by Tianjin Zhonghuan Company) for 6 h, and the carbonization temperature was 800 o C, the heating rate is 20 o C / min, the cooling rate is 10 o C / min. A nitrogen-doped leaf-shaped carbo...

Embodiment 3

[0061] (1) Take 30 mL of a 1 mg / mL leaf-shaped carbon nanomaterial solution, add 100 mg of triphenylphosphine as a P source, and disperse ultrasonically until a uniform suspension is formed3.

[0062] (2) Seal the suspension 3 in a 50 mL hydrothermal reactor and place it at 200 o C in an oven for 20 h to obtain block hydrogel.

[0063] (3) Add ethanol to the hydrogel, pour out the ethanol after soaking for 5 h, repeat 4 times, add water to the hydrogel, pour out the water after soaking for 5 h, repeat 6 times, pour the water Glue at -70 oC Freeze for ≥30 min, then at 40 o C dried for 24 h to obtain leaf-like carbon nanomaterial aerogels; both freezing and drying processes were carried out under a vacuum of 10 Pa.

[0064] (4) The obtained leaf-shaped carbon nanomaterial airgel was carbonized in an argon-protected high-temperature carbonization furnace (produced by Tianjin Zhonghuan Company) for 3 h, and the carbonization temperature was 900 o C, the heating rate is 10 o ...

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Abstract

The invention belongs to the technical field of nanometer materials and particularly relates to a heteroatom doped leaf-shaped carbon nanometer aerogel material and a preparation method and an application of the heteroatom doped leaf-shaped carbon nanometer aerogel material. The carbon nanometer leaf is a biomimetic concept, a carbon nanometer tube is used for simulating the leaf vein of the leaf, a graphene nanoribbon is used for simulating the leaf, and the carbon nanometer leaf is a seamless bridged hybrid structure of the carbon nanometer tube and the grapheme nanoribbon. The aerogel is assembled by adopting the carbon nanometer leaves as basic structural units, and then a heteroatom doped three-dimensional net structure is realized. The preparation method of the aerogel comprises the following steps: preparing a carbon nanometer leaf solution, adding moderate amount of soluble dopants to the solution, and then carrying out hydrothermal to obtain uniform hydrogel, and then drying and charring to obtain the heteroatom doped carbon nanometer leaf aerogel. The aerogel can be used as a cathode catalyst of the fuel cell, and has a catalytic performance better than that of the commercial Pt / C and the potential application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a heteroatom-doped carbon nanometer airgel material with a leaf-like structure and a preparation method and application thereof. Background technique [0002] In recent years, with the discovery of graphene, carbon materials have aroused a new wave of research in the traditional material chemistry field. Graphene is the thinnest nanomaterial with the best mechanical properties known in the world. It is superior to carbon nanotubes, diamond, graphite, etc. in many fields. It not only has high thermal conductivity (5300 W / m K), ultrafast electron mobility (15000 cm 2 / V·s), more importantly, it is the material with the smallest resistivity known so far, and the resistivity is only about 10 -6 Ω·cm. Perfect graphene has an ideal two-dimensional crystal structure, and electrons can move freely in its π-conjugated system, which endows graphene with goo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00C01B13/02H01M4/90H01M4/96
CPCB01J13/0052C01B13/02H01M4/9083Y02E60/50
Inventor 易涛陈亮
Owner FUDAN UNIV
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