Boron-nitrogen co-doped carbon/manganese oxide composite nanosheet material, preparation method and application

A technology of manganese oxide and carbon nanosheets, which is applied in the field of composite materials, can solve the problems of poor conductivity of manganese oxide, and achieve the effects of easy operation, high specific surface area, and simple and easy preparation method

Active Publication Date: 2020-01-03
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the problem that the existing pseudocapacitive electrode material manganese oxidation conductivity is poor

Method used

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  • Boron-nitrogen co-doped carbon/manganese oxide composite nanosheet material, preparation method and application
  • Boron-nitrogen co-doped carbon/manganese oxide composite nanosheet material, preparation method and application
  • Boron-nitrogen co-doped carbon/manganese oxide composite nanosheet material, preparation method and application

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Experimental program
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Embodiment 1

[0037] A preparation method of boron-nitrogen co-doped carbon nanosheet material:

[0038] (1) Add 2g of chitosan and 5mL of acetic acid into 150mL of deionized water to fully dissolve, and fully stir to form a chitosan hydrogel.

[0039] (2) Add 0.5 g of boric acid to the chitosan hydrogel obtained in step (1), stir evenly, and fully freeze-dry to obtain a solid mixture of boric acid and chitosan hydrogel.

[0040] (3) Transfer the sample obtained in step (2) to a tube furnace, raise the temperature to 800°C at a rate of 2°C / min in a nitrogen atmosphere, keep it for 2h, and carry out carbonization to obtain boron-nitrogen co-doped carbon Nanosheet, denoted as BNC.

[0041] The scanning electron microscope picture and the transmission electron microscope picture of boron nitrogen co-doped carbon nanosheet BNC in the present embodiment are respectively as follows figure 1 Middle (A) and image 3 As shown in (A), it can be seen that the thickness of the boron-nitrogen co-dope...

Embodiment 2

[0046] A preparation method of boron and nitrogen co-doped carbon / manganese oxide composite nanosheet material:

[0047] (1) Add 2g of chitosan and 5mL of acetic acid into 150mL of deionized water to fully dissolve, and fully stir to form a chitosan hydrogel.

[0048] (2) Add 0.5 g of boric acid to the chitosan hydrogel obtained in step (1), stir evenly, and fully freeze-dry to obtain a solid mixture of boric acid and chitosan hydrogel.

[0049] (3) Transfer the sample obtained in step (2) to a tube furnace, raise the temperature to 800°C at a rate of 2°C / min in a nitrogen atmosphere, keep it for 2h, and carry out carbonization to obtain boron-nitrogen co-doped carbon Nanosheet, denoted as BNC.

[0050] (4) react the sample obtained in step (3) with 100mL 10mM potassium permanganate solution, the reaction time is 2h, and the reaction temperature is 50°C to obtain the boron-nitrogen co-doped carbon / manganese oxide composite nanosheet material, denoted as MnO-2@BNC.

[0051] ...

Embodiment 3

[0056] A preparation method of boron and nitrogen co-doped carbon / manganese oxide composite nanosheet material:

[0057] (1) Add 2g of chitosan and 5mL of acetic acid into 150mL of deionized water to fully dissolve, and fully stir to form a chitosan hydrogel.

[0058] (2) Add 0.5 g of boric acid to the chitosan hydrogel obtained in step (1), stir evenly, and fully freeze-dry to obtain a solid mixture of boric acid and chitosan hydrogel.

[0059] (3) Transfer the sample obtained in step (2) to a tube furnace, raise the temperature to 800°C at a rate of 2°C / min in a nitrogen atmosphere, keep it for 2h, and carry out carbonization to obtain boron-nitrogen co-doped carbon Nanosheet, denoted as BNC.

[0060] (4) react the sample obtained in step (3) with 100mL 10mM potassium permanganate solution, the reaction time is 4h, and the reaction temperature is 50°C to obtain the boron-nitrogen co-doped carbon / manganese oxide composite nanosheet material, denoted as MnO-4@BNC.

[0061] ...

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Abstract

The invention discloses a boron-nitrogen co-doped carbon/manganese oxide composite nanosheet material, a preparation method, and an application of the composite nanosheet material in capacitive deionization or in an electrode material of an electrochemical energy storage device. The preparation method comprises the following steps: adding boric acid into chitosan hydrogel, uniformly mixing the boric acid and the chitosan hydrogel, freeze-drying the mixture, and carbonizing the mixture to obtain boron-nitrogen co-doped carbon nanosheets; and putting the boron-nitrogen co-doped carbon nanosheetsin a potassium permanganate solution for reaction to obtain the boron-nitrogen co-doped carbon/manganese oxide composite nanosheet material. The boron-nitrogen co-doped carbon/manganese oxide composite nanosheet material is of a mutually connected three-dimensional sheet structure. The preparation method provided by the invention is simple and feasible, the reaction conditions are mild, and the carbon nanosheets are of a three-dimensional mutual connection structure. The prepared carbon/manganese oxide composite nanosheet material is rich in nitrogen and boron and is of a mesoporous-dominatedporous structure. The composite nanosheet material shows a good prospect in the fields of preparation of capacitive deionization and super capacitor electrodes and catalyst carriers.

Description

technical field [0001] The invention relates to a boron-nitrogen co-doped carbon / manganese oxide composite nanosheet material, a preparation method and an application, and belongs to the technical field of composite materials. Background technique [0002] Electrode materials play an important role in capacitive deionization, and their structural properties are closely related to their capacitive deionization capabilities. In general, capacitive deionization electrode materials can be divided into two categories: one is carbon materials based on electric double layer capacitance, such as activated carbon, graphene, carbon nanotubes, carbon fibers, biochar and carbon aerogel. Carbon materials used for capacitive desalination usually have the following characteristics: 1), a large specific surface area to increase the contact area between the electrode material and the electrolyte; Attachment or intercalation-extraction provide convenient transport channels; 3), excellent ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/46C02F1/469B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C02F1/4691H01G11/24H01G11/30H01G11/36H01G11/46Y02E60/13
Inventor 谢峥峥刘建允商晓红胡彬聂鹏飞
Owner DONGHUA UNIV
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