Preparation method and application of highly graphitized biomass-based porous nitrogen-doped carbon fiber material

A nitrogen-doped carbon fiber and graphitization technology, applied in the chemical field, can solve the problems of restricting the development of cotton fiber application and low performance

Active Publication Date: 2021-05-18
BEIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xue et al. reported a cotton-derived carbon fiber material for a fully foldable supercapacitor with a specific capacitance of only 13 F g -1 (Phys.Chem.Chem.Phys.15(2013)8042-8045)
Lower performance limits the application development of cotton fiber

Method used

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  • Preparation method and application of highly graphitized biomass-based porous nitrogen-doped carbon fiber material
  • Preparation method and application of highly graphitized biomass-based porous nitrogen-doped carbon fiber material
  • Preparation method and application of highly graphitized biomass-based porous nitrogen-doped carbon fiber material

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Experimental program
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Effect test

Embodiment 1

[0030] 0.75 g of waste cotton fiber (CF) was placed in a solution of dimethylimidazole in dry methanol (45 mL) at room temperature. After soaking for 24 hours, mix 45mL of anhydrous methanol solution of zinc nitrate with the above and stir well. After soaking for 24 h, it was washed with anhydrous methanol and dried (60 °C) to obtain the Zn-MOF / CF composite. The composite material is placed in a tube furnace, and an inert gas (high-purity nitrogen or argon) is introduced as a protective gas. The tube furnace was heated at a rate of 5°C min -1 Raise the temperature to 800°C for 2h. After cooling down to room temperature, use 6mol L -1 Soak in HCl solution at 60°C for 24h. Subsequently, it was washed several times with ultrapure water until the pH of the washing solution was 7 (neutral). After drying, a partially graphitized nitrogen-doped porous carbon fiber material is obtained. There is an obvious Zn-MOF framework structure on the carbon fiber surface ( figure 2 ), th...

Embodiment 2

[0032] Waste cotton fibers were placed in a mixed solution of dimethylimidazole (0.821 g) in absolute methanol and absolute ethanol (40 mL, volume ratio 1:1). After soaking for several hours, mix 40mL of zinc nitrate in anhydrous methanol and anhydrous ethanol (volume ratio: 1:1) with it, and stir well. Stand still for 24 hours, take out the composite cotton fiber material and clean it with absolute ethanol. After drying, the Zn-MOF / CF composite material can be obtained. The composite material is placed in a tube furnace, and an inert gas (high-purity nitrogen or argon) is introduced as a protective gas. The tube furnace was heated at a rate of 5°C min -1 Raise the temperature to 800°C for 2h. After cooling down to room temperature, use 6mol L -1 Soak in HCl solution at 60°C for 24h. Subsequently, it was washed several times with ultrapure water until the pH of the washing solution was 7 (neutral). After drying, a partially graphitized nitrogen-doped porous carbon fiber ...

Embodiment 3

[0034]Discarded cotton fibers (0.75 g) were placed in a solution of dimethylimidazole (0.821 g) in anhydrous methanol (45 mL) at room temperature. After soaking for 24 hours, 45 mL of anhydrous methanol solution of 0.1 g of zinc nitrate was fully stirred and mixed with the above solution. After soaking for 24 h, it was washed with anhydrous methanol and dried (60 °C) to obtain the Zn-MOF / CF composite. The Zn-MOF / CF composite was placed in a mixed solution of dimethylimidazole (0.821 g) in absolute methanol and absolute ethanol (40 mL, volume ratio 1:1). After soaking for 24 hours, mix 40mL cobalt nitrate (1g) in anhydrous methanol and absolute ethanol mixed solution (1:1 volume ratio) with it, and stir well. Stand still for 24 hours, take out the composite cotton fiber material and clean it with absolute ethanol. After drying, the Co-MOF@Zn-MOF / CF composite material can be obtained. The composite material is placed in a tube furnace, and an inert gas (high-purity nitrogen o...

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Abstract

The invention discloses a preparation method of a highly graphitized biomass-based porous nitrogen-doped carbon fiber electrode material, which is used in the field of flexible supercapacitors. The preparation method comprises the following steps: growing an organic metal framework of Zn in situ, growing one or more organic metal frameworks of Fe or Co or Ni in situ again, and then carbonizing and pickling. The prepared highly graphitized carbon fiber material has excellent electrochemical performance and flexibility. The preparation method has the main advantages that 1) the specific surface area of the highly graphitized carbon fiber material is large, and more adsorption sites are provided; 2) heteroatoms (nitrogen atoms) are introduced, so that the pseudocapacitance can be increased, and the hydrophilicity of the material can be improved; and 3) high graphitization can improve the conductivity of the material.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a preparation method and application of a highly graphitized biomass-based porous nitrogen-doped carbon fiber material. Background technique [0002] With the rapid development of portable devices and wearable electronic devices, the development of stable and efficient flexible energy storage devices has become a research hotspot of scholars. Compared with other energy storage devices, supercapacitors are high-efficiency new energy storage devices with a series of advantages such as high power density, long cycle life, maintenance-free, high charge and discharge efficiency, and can be widely used in the start-up of electric vehicles, consumer electronics equipment and other fields. At present, the electrode materials of supercapacitors mainly include carbon materials, metal oxide (sulfur) compounds or hydroxides, and conductive polymers. Porous carbon materials have excellent physical ...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/26H01G11/40H01G11/86
CPCH01G11/24H01G11/26H01G11/40H01G11/86Y02E60/13
Inventor 时君友赵广震孙钟徐文彪
Owner BEIHUA UNIV
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