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Preparation method of nitrogen-doped activated carbon and multi-element hydroxide/biomass porous carbon nano composite electrode material

An electrode material, nanocomposite technology, applied in chemical instruments and methods, hybrid capacitor electrodes, nickel oxide/nickel hydroxide, etc., can solve the problem of small specific surface area of ​​porous biomass carbon materials

Active Publication Date: 2021-12-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the technical problem that the specific surface area of ​​the porous biomass carbon material prepared by the existing method is small, and to provide nitrogen-doped activated carbon and multi-hydroxide / biological Preparation method of material porous carbon nanocomposite electrode material

Method used

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  • Preparation method of nitrogen-doped activated carbon and multi-element hydroxide/biomass porous carbon nano composite electrode material
  • Preparation method of nitrogen-doped activated carbon and multi-element hydroxide/biomass porous carbon nano composite electrode material
  • Preparation method of nitrogen-doped activated carbon and multi-element hydroxide/biomass porous carbon nano composite electrode material

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Embodiment 1

[0030] Embodiment 1: This embodiment directly carbonizes corn cobs, and prepares activated carbon as a comparison. The specific steps are as follows:

[0031] 1. Freeze-dry the cleaned corn cobs with a freeze dryer at a temperature of -55°C and a vacuum of 10 Pa for 24 hours to obtain dried corn cobs;

[0032] 2. Put 3 grams of dry corncobs into the heating furnace, heat at 5°C min -1 The temperature was raised to 800°C and kept for 2 hours for carbonization, and the temperature was lowered to take out to obtain activated carbon as a comparison. Expressed in AC.

Embodiment 2

[0033] Embodiment 2: the preparation method of the nitrogen-doped activated carbon of the present embodiment is carried out according to the following steps:

[0034] 1. Freeze-dry the cleaned corncobs with a freeze dryer at a temperature of -55°C and a vacuum of 12Pa for 24 hours to obtain dried corncobs;

[0035] 2. Mix 3 grams of dry corn cob with 9 grams of NH 4 HCO 3 Mix well, put into the heating furnace, under N 2 Atmosphere, at 5°C min -1 The temperature was raised to 800°C at a certain rate and kept for 2 hours for carbonization, and the temperature was lowered to take out to obtain carbonized products;

[0036] 3. Wash the charcoal with 1M hydrochloric acid and deionized water in sequence, and finally dry it in a furnace at 60° C. for 12 hours to obtain nitrogen-doped activated carbon. Expressed in NAC.

Embodiment 3

[0037] Embodiment 3: utilize the nitrogen-doped activated carbon prepared in embodiment 2 to prepare the method for multiple hydroxide / biomass porous carbon nanocomposite electrode material, carry out according to the following steps:

[0038] 1. Mix 1mmol NiSO 4 ·6H 2 O and 0.5mmol Co(NO 3 ) 2 ·6H 2 O and 50 mg of nitrogen-doped activated carbon were dissolved in 35 mL of deionized water, stirred and ultrasonicated for 30 minutes to obtain a precursor solution;

[0039] Two, the 35mL precursor solution and 1mL mass percent concentration are 25% ammonia water (NH 3 ·H 2 O) Transfer to an autoclave with a volume of 50mL, then raise the temperature to 150°C and keep it for 5 hours, then filter, wash the solid phase with ethanol and deionized water successively, and then wash it at 60°C and a vacuum of -0.095MPa Under the condition of vacuum drying for 12 hours, the binary hydroxide / biomass porous carbon nanocomposite electrode material is obtained. Represented by Co-Ni LD...

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Abstract

The invention discloses a preparation method of nitrogen-doped activated carbon and a multi-element hydroxide / biomass porous carbon nano-composite electrode material, and relates to a preparation method of activated carbon and a porous carbon nano-composite electrode material. The technical problem that an existing porous biomass carbon material is small in specific surface area is solved. The nitrogen-doped activated carbon is obtained by carrying out high-temperature carbonization on corncobs and NH4HCO3; the preparation method of the multi-element hydroxide / biomass porous carbon nano-composite electrode material comprises the steps: dissolving NiSO4.6H2O, Co(NO3)2.6H2O, AlCl3.6H2O and the nitrogen-doped activated carbon in water to prepare a precursor solution; and transferring the precursor solution and ammonia water into a high-pressure kettle for hydro-thermal synthesis to obtain the electrode material. The specific surface area of the nitrogen-doped activated carbon reaches 800 m<2>*g<-1>-900 m<2>*g<-1>. The specific capacitance of the multi-element hydroxide / biomass porous carbon nano-composite electrode material reaches 240-1836.7 F*g<-1>, and the multi-element hydroxide / biomass porous carbon nano-composite electrode material can be applied to the field of electrode materials.

Description

technical field [0001] The invention relates to activated carbon, porous carbon nanometer composite electrode material and a preparation method thereof. Background technique [0002] With the massive consumption of fossil fuels and increasing environmental pollution, the demand for raw energy storage devices has surged, thus accelerating the research of high-performance devices and related electrode materials. Supercapacitors have attracted extensive attention and scientific research due to their excellent power density, long cycle life, and fast charge-discharge kinetics. However, low energy density hinders their widespread application, and electrodes made of highly conductive carbon materials such as graphene and carbon nanotubes are expensive. Therefore, the development of low-cost, high-capacitance nanomaterial electrodes has become the key to obtain high-performance supercapacitors. [0003] Among various nanomaterials, transition metal hydroxides have a series of adv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/342C01G53/04H01G11/34H01G11/30H01G11/24B82Y30/00B82Y40/00
CPCC01B32/324C01B32/342C01G53/04H01G11/34H01G11/30H01G11/24B82Y30/00B82Y40/00C01P2002/85C01P2006/17C01P2006/40C01P2006/12C01P2004/80C01P2004/03Y02E60/13
Inventor 姜再兴张仁杰张伟井晶李冰高国林张大伟董继东马丽娜黄玉东
Owner HARBIN INST OF TECH