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Preparation method and application of konjac-flour-based porous carbon material

A porous carbon and powder-based technology, which is applied in carbon preparation/purification, hybrid/electric double-layer capacitor manufacturing, hybrid capacitor electrodes, etc., can solve the problems of complex preparation process and high preparation cost of supercapacitor electrode materials, and achieve excellent electrical properties. Effects of chemical properties, high specific surface area, and high yield

Inactive Publication Date: 2017-06-27
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide the preparation and application of a konjac flour-based porous carbon material to solve the problems of complicated preparation process and high preparation cost of supercapacitor electrode materials

Method used

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  • Preparation method and application of konjac-flour-based porous carbon material
  • Preparation method and application of konjac-flour-based porous carbon material
  • Preparation method and application of konjac-flour-based porous carbon material

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preparation example Construction

[0028] The preparation method of konjac flour base porous carbon material of the present invention is as follows:

[0029] (1) Preparation of pre-carbonized products: put the konjac flour raw material into a graphite crucible, place it in a resistance furnace, and heat it anaerobically at 200-500 °C (preferably 300-500 °C) at a heating rate of 3-10 °C min -1 , preferably 3~5 ℃ min -1 ; The holding time is 1~3 h, and after fully pyrolyzing under normal pressure, it is lowered to room temperature to obtain the pre-carbonized product;

[0030] (2) Preparation of activated precursor mixture: mix the obtained pre-carbonized product with an activator, and the mass ratio of the activator to the pre-carbonized product is 1:30~30:1, preferably 1:1~9:1 ; Add deionized water, stir for 5 h in the state of the solution, and dry the solution at 60 °C to constant weight to obtain the activated precursor mixture;

[0031] (3) Preparation of konjac flour-based porous carbon material: put th...

Embodiment 1

[0038] (1) Put 1.5 g of konjac flour raw material into a 20 mL graphite crucible, place it in a resistance furnace, and heat it anaerobically at 400 °C with a heating rate of 5 °C min -1 , the holding time is 1 h, and after fully pyrolyzing under normal pressure, it is cooled to room temperature with the furnace to obtain a pre-carbonized product, which is ground in a mortar and put into a desiccator for use;

[0039] (2) Take 1.2 g of potassium hydroxide and 0.4 g of the pre-carbonized product obtained in (1) (mass ratio is 3:1), put them into a beaker, add 20 mL of deionized water, and carry out magnetic stirring for 5 After h, it was poured into an evaporating dish, dried in an oven at 60 °C to constant weight to obtain a black solid powder, and then ground to obtain an activated precursor mixture;

[0040] (3) Put 1.6 g of the activated precursor mixture in (2) into a 20 mL graphite crucible, place in a resistance furnace, and heat anaerobically at 700 °C with a heating ra...

Embodiment 2

[0042] (1) Put 1.5 g of konjac flour raw material into a 20 mL graphite crucible, place it in a resistance furnace, and heat it anaerobically at 500 °C with a heating rate of 4 °C min -1 , the holding time is 1 h, and after fully pyrolyzing under normal pressure, it is cooled to room temperature with the furnace to obtain a pre-carbonized product, which is ground in a mortar and put into a desiccator for use;

[0043] (2) Take 2.0 g of potassium hydroxide and 0.4 g of the pre-carbonized product obtained in (1) (mass ratio: 5:1), put them into a beaker, add 20 mL of deionized water, and carry out magnetic stirring for 5 After h, it was poured into an evaporating dish, dried in an oven at 60 °C to constant weight to obtain a black solid powder, and then ground to obtain an activated precursor mixture;

[0044] (3) Put 2.4 g of the activated precursor mixture in (2) into a 20 mL graphite crucible, place in a resistance furnace, and heat anaerobically at 800 °C with a heating rate...

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Abstract

The invention provides a preparation method and application of a konjac flour-based porous carbon material, and belongs to the technical field of preparation of porous carbon materials. The preparation method of the konjac flour-based porous carbon material of the present invention is as follows: firstly, the raw material of konjac flour is pyrolyzed under normal pressure to obtain a pre-carbonized product; then the pre-carbonized product is mixed with an activator, deionized water is added and stirred, and then dried to a constant weight to obtain an activated precursor mixture; then, the activated precursor mixture is carbonized at a high temperature aerobic and then lowered to room temperature, washed with hydrochloric acid, and dried to a constant weight to obtain a konjac flour-based porous carbon material. The prepared konjac flour-based porous carbon materials can be used as supercapacitor electrode materials. The preparation method of the invention is simple and feasible, low in cost and excellent in performance, and is suitable for large-scale commercial production. This method provides a new way for the preparation of porous carbon materials.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous carbon materials, and more specifically relates to a preparation method and application of konjac flour-based porous carbon materials. Background technique [0002] Supercapacitors have attracted much attention as a class of efficient energy storage devices. Supercapacitors are widely used in fields such as electric transportation, digital equipment and pulse technology because of their excellent performance. In recent years, some researchers have prepared electrode materials for supercapacitors with excellent electrochemical performance by taking advantage of the excellent electrical conductivity and high specific surface area of ​​graphene, carbon nanotubes, and their composites. However, their complex synthesis process, high equipment requirements, and high cost limit the commercial application of supercapacitors. Biomass porous carbon materials are widely used as electrode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01G11/44H01G11/86
CPCY02E60/13H01G11/44C01P2004/03C01P2006/40H01G11/86
Inventor 吕秋丰林晓强梁恕侠靳艳巧
Owner FUZHOU UNIV
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