A kind of lignin-based two-dimensional carbon nanomaterial and its preparation method and application

A carbon nanomaterial and lignin-based technology, which is applied in the field of lignin-based two-dimensional carbon nanomaterials and their preparation, carbon materials and their preparation, and can solve the problems of single material morphology, complex preparation method steps, and no specific structure. , to achieve the effect of simple preparation process, good application prospect and stable structure

Active Publication Date: 2018-12-21
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the steps of its preparation method are complicated, involving the use and removal of activators, and also have the disadvantage of poor controllability of the material morphology, which is not conducive to the practical application of materials and preparation technology
[0006] In summary, the deficiencies of the prior art are mainly reflected in: 1) the obtained material has a single shape, is fibrous or has no specific structure; 2) the preparation method of the material is complicated and requires the use of hard templates and activators, which cannot meet the requirements of practical applications and environments. The development of dual requirements for material preparation technology

Method used

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  • A kind of lignin-based two-dimensional carbon nanomaterial and its preparation method and application
  • A kind of lignin-based two-dimensional carbon nanomaterial and its preparation method and application
  • A kind of lignin-based two-dimensional carbon nanomaterial and its preparation method and application

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Embodiment 1

[0035] Add 10 mL of deionized water, 2 g of lignin and 2 g of ammonium chloride to the beaker, stir for 10 min to obtain a mixture, and put the mixture into an alumina crucible after freeze-drying. The temperature was raised to 1000°C at 5°C / min, kept at this temperature for 5h, and then naturally cooled to room temperature, washed with deionized water, and dried to obtain a carbon material product. figure 1 For the scanning electron microscope (SEM) picture of the two-dimensional carbon nanomaterial prepared in embodiment 1, from figure 1 It can be seen that the obtained two-dimensional carbon nanomaterial has a curled sheet structure, the lateral size of the sheet is 2-5 μm, and the thickness of the sheet is about 20 nm; figure 2 For the nitrogen adsorption-desorption curve (a) and pore distribution figure (b) of the two-dimensional carbon nanomaterial prepared in embodiment 1, from figure 2 It can be seen that the specific surface area of ​​the obtained material is 1880m...

Embodiment 2

[0037] Add 10 mL of deionized water, 2 g of lignin and 20 g of urea into the beaker, fully dissolve to obtain a mixture, and put the mixture into an alumina crucible after freeze-drying. The temperature was raised to 450°C in min, kept at this temperature for 1h, then raised to 900°C at 5°C / min, kept at this temperature for 3h, then naturally cooled to room temperature, washed with deionized water, and dried to obtain a carbon material product. Figure 5 For the scanning electron microscope (SEM) picture of the two-dimensional carbon nanomaterial prepared in embodiment 2, from Figure 5 It can be seen that the material prepared in this embodiment is a porous material composed of a lamellar structure; Image 6 For the nitrogen adsorption-desorption curve (a) and pore distribution figure (b) of the two-dimensional carbon nanomaterial prepared in embodiment 2, from Image 6 It can be seen that the specific surface area of ​​the obtained material is 465.68m 2 / g, is a porous mater...

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Abstract

The invention relates to a lignin-based two-dimensional carbon nano-material as well as a preparing method and an application thereof and belongs to the technical field of carbon materials. The two-dimensional carbon nano-material is prepared by the following steps of: after mixing lignin and a nitrogen-containing compound, carrying out pyrolysis and carbonization at an atmosphere, and then, washing and drying a pyrolysed and carbonized product. The two-dimensional carbon nano-material is of a curly flaky-layer structure, the lateral dimension of the flaky layer is 0.5-5mum, the thickness of the flaky layer is 10-50nm, and the specific surface area is larger than 400m<2> / g. By utilizing the regulating function of the nitrogen-containing compound on a carbonization process, a two-dimensional carbon nanometer structure is directly pyrolysed and synthesized without using additives, such as a catalyst, a hard template and an activating agent, or complicated instruments and equipment, the preparing process is simple, and industrial production and application can be realized. Besides, the prepared lignin-based two-dimensional carbon nano-material is stable in structure, and when is applied to the aspect of electromechanical energy storage, has a remarkable double-electric-layer capacitance property. A prepared supercapacitor has the advantages of being high in energy density, great in cycling property and the like.

Description

technical field [0001] The invention relates to a carbon material and its preparation method and application, in particular to a lignin-based two-dimensional carbon nanomaterial and its preparation method and application, belonging to the technical field of carbon materials. Background technique [0002] Lignin is one of the main components of plant fiber raw materials, and its reserves in nature are second only to cellulose. It is a natural aromatic polymer containing a variety of active groups, with a carbon content of more than 50%. However, the current research on the utilization of lignin is still at a preliminary level, and it is mainly discharged as waste in the papermaking / plant hydrolysis process or burned as fuel, which not only has a low utilization rate, but also causes huge pollution to the environment. [0003] The high-value utilization of lignin is of great significance to the development of the national economy and the sustainable development of the environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15H01G11/36H01G11/44
CPCY02E60/13
Inventor 刘乔杨为佑
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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