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Nitrogen-doped carbon flexible paper and its preparation method and application

A carbon-flexible, nitrogen-doped technology, used in textiles and papermaking, electrical components, battery electrodes, etc., can solve the problems of low energy density of self-supporting electrodes, difficult to scale preparation, and harsh conditions, and achieve excellent oxygen reduction catalysis. performance, guaranteed bending modulus range, good bending flexibility effect

Inactive Publication Date: 2018-05-25
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of carbon nanotube sponge and graphene foam by vapor deposition method requires relatively harsh conditions and is difficult to produce on a large scale; while the electrospun carbon fiber cloth prepared by electrospinning method has limited flexibility, and at the same time, the carbon fibers are electrically conductive by contact, and the contact resistance is low. Larger; carbon nano / polymer composites mainly rely on carbon nanomaterial fillers to conduct electricity, and the conductivity is relatively low
Carbonized polymer foam, such as melamine foam, forms a carbon foam with good elasticity, although it can be used as a flexible electrode to some extent, but this carbon foam has too high porosity and low density, so it has low electrical conductivity , the self-supporting electrode used as an energy storage device has low energy density and low rate capability

Method used

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  • Nitrogen-doped carbon flexible paper and its preparation method and application
  • Nitrogen-doped carbon flexible paper and its preparation method and application
  • Nitrogen-doped carbon flexible paper and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A nitrogen-doped carbon flexible paper is prepared by the following method:

[0035] (1) Low temperature thermal oxidation: the thickness is 2cm, the density is 8mg / cm 3 The melamine foam is placed in an electric furnace, heated to 250°C in an air atmosphere, and kept at this temperature for 0.5h;

[0036] (2) High-temperature heat treatment: the melamine foam through low-temperature thermal oxidation in step (1) is placed in an electric furnace, and under the protection of nitrogen, 5 g / cm2 is applied to the melamine foam through low-temperature thermal oxidation. 2 After mechanical pressure, heat up to 900°C at a heating rate of 3 , the flexural modulus of paper-1 measured by the three-point bending method is 20.5kPa, the conductivity measured by the four-probe method is 0.15S / cm, and the thickness of the paper-1 is 680 microns (such as figure 1 shown), with an interconnected carbon network structure (such as figure 2 shown).

Embodiment 2

[0038] The operation method of embodiment 2 is substantially the same as embodiment 1, and difference is that in step (2), mechanical pressure is 20g / cm 2 , the nitrogen-doped carbon flexible paper is marked as paper-2; the density of paper-2 is weighed and calculated to be 90.5mg / cm 3 , the flexural modulus of paper-2 measured by three-point bending is 46kPa, the conductivity measured by four-probe method is 0.56S / cm, and the thickness of this paper-2 is 380 microns (such as image 3 shown), with an interconnected carbon network structure (such as Figure 4 shown).

Embodiment 3

[0040] The operation method of Example 2 is basically the same as that of Example 1, the difference is that in step (2), heating to 1000°C and keeping it warm at this temperature for 0.5h, the obtained nitrogen-doped carbon flexible paper is marked as Paper-3; The density of weighing test paper-3 is 25.3mg / cm 3 , the flexural modulus of paper-3 measured by three-point bending is 26kPa, and the conductivity measured by four-probe method is 1.2S / cm. Scanning electron microscopy shows that the thickness of paper-3 is 342 microns, with interconnected carbon network structure.

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Abstract

The invention discloses a nitrogen-doped carbon flexible paper and its preparation method and application. After the melamine foam undergoes low-temperature thermal oxidation in the air, and then undergoes high-temperature heat treatment in an inert gas atmosphere under the action of mechanical pressure, the nitrogen-doped paper can be obtained. Carbon flexible paper. In this method, the melamine foam is firstly subjected to low-temperature heat treatment. The purpose is to introduce a small amount of oxygen-containing functional groups into the melamine foam to promote the cyclization of the melamine foam during high-temperature heat treatment, so that the nitrogen-doped carbon paper has good bending flexibility. The thickness, density and conductivity of nitrogen-doped carbon flexible paper can be controlled within the flexible range, which has greater flexibility and is easy to scale. The flexible paper prepared by the method of the invention has an interconnected carbon network structure, exhibits good bending flexibility, and can be bent arbitrarily; the flexible paper has excellent oxygen reduction catalytic performance. The prepared nitrogen-doped carbon flexible paper can be used as a self-supporting flexible electrode material for flexible electronic devices.

Description

technical field [0001] The invention relates to a flexible paper, in particular to a nitrogen-doped carbon flexible paper and its preparation method and application. Background technique [0002] In recent years, with the rapid development of modern science and technology, more and more portable products appear in people's daily life. Electronic products are gradually developing towards small, wearable, foldable, and flexible, which requires light, thin, and tough energy storage devices for electronic products. Building these flexible energy storage devices requires the development of high-performance flexible electrode materials. Carbon materials are widely used as electrode materials for energy storage devices due to their good electrical conductivity and chemical stability. At present, the flexible carbon electrode materials reported in the literature mainly include the following categories: (1) carbon nanotube sponge and graphene foam prepared by vapor deposition metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/96D01F9/12
CPCD01F9/12H01M4/583H01M4/96Y02E60/10Y02E60/50
Inventor 陈水亮章华侯豪情
Owner JIANGXI NORMAL UNIV
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